abbreviation or symbol - detailed drawing

8/17/2019 Abbreviation or Symbol - DeTAILED DRAWING

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Abbreviation or

symbolDefinition Description

0-9

A

ACacross corners

Commonly used when measuring the corners of a

hex drive, such as a hex nut.

AFacross flats

Commonly used when measuring the flat surfaces of

a hex drive, such as a hex nut.

AISI

American Iron and

Steel Institute

The AISI acronym is commonly seen as a prefix

to steel grades, for example, "AISI !". The SA#

steel grade system was formerly a $oint AISI%SA#

system.

Al or A& aluminium

A&' alloy

A(#) American )eferring to the *nited States

A(S

Aerospace (aterial

Standards

Standards in materials science and

engineering maintained +y SA# International and

widely used in the aerospace

manufacturingindustries.

https://en.wikipedia.org/wiki/American_Iron_and_Steel_Institutehttps://en.wikipedia.org/wiki/American_Iron_and_Steel_Institutehttps://en.wikipedia.org/wiki/Steel_gradeshttps://en.wikipedia.org/wiki/SAE_steel_gradeshttps://en.wikipedia.org/wiki/SAE_steel_gradeshttps://en.wikipedia.org/wiki/SAE_steel_gradeshttps://en.wikipedia.org/wiki/Aluminiumhttps://en.wikipedia.org/wiki/Alloyhttps://en.wikipedia.org/wiki/United_Stateshttps://en.wikipedia.org/wiki/United_Stateshttps://en.wikipedia.org/wiki/Materials_science_and_engineeringhttps://en.wikipedia.org/wiki/Materials_science_and_engineeringhttps://en.wikipedia.org/wiki/SAE_Internationalhttps://en.wikipedia.org/wiki/Aerospace_manufacturerhttps://en.wikipedia.org/wiki/Aerospace_manufacturerhttps://en.wikipedia.org/wiki/Aerospace_manufacturerhttps://en.wikipedia.org/wiki/Aerospace_manufacturerhttps://en.wikipedia.org/wiki/Steel_gradeshttps://en.wikipedia.org/wiki/SAE_steel_gradeshttps://en.wikipedia.org/wiki/SAE_steel_gradeshttps://en.wikipedia.org/wiki/Aluminiumhttps://en.wikipedia.org/wiki/Alloyhttps://en.wikipedia.org/wiki/United_Stateshttps://en.wikipedia.org/wiki/Materials_science_and_engineeringhttps://en.wikipedia.org/wiki/Materials_science_and_engineeringhttps://en.wikipedia.org/wiki/SAE_Internationalhttps://en.wikipedia.org/wiki/Aerospace_manufacturerhttps://en.wikipedia.org/wiki/Aerospace_manufacturerhttps://en.wikipedia.org/wiki/American_Iron_and_Steel_Institutehttps://en.wikipedia.org/wiki/American_Iron_and_Steel_Institute


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A%

Army%avy

A prefix for standard hardware -catalog hardware I/

num+ers. Came from the era of circa !01s%!12,

when the *.S. Army and avywere leading the way

on product standardi3ation for logistics improvement,yielding the *nited States (ilitary Standards system.

Today industry and IS4 also do a lot of this

standardi3ation specification, freeing the

*.S. /4/ and military to do less of it -as explained

at*nited States (ilitary Standard 5 4rigins and

evolution, although many (I& standards are still

current. -See also (S% and AS.

A anneal, annealed

ASI American ational

Standards Institute

And the many standards that it issues, for example,

ASI 607.!.

A88)49:;< approximately

A=&

accepta+le >uality level

The threshold of defectiveness that is allowa+le in a

group of parts. It is trivial to say that no one wants

any error, and that everyone wants uniform

perfection? +ut in the real world, it almost never

happens. The intelligence +ehind defining A=&s is in

figuring out how much error is tolera+le given the

costs that would +e incurred +y any efforts to further

reduce its incidence.

A) as re>uired An a++reviation used in parts lists -8&s, &(s, @o(s

in the >uantity%per%assem+ly field when a discrete

count is not applica+le. For example, in an assem+ly

with a +olted $oint using four +olts, the 8& >uantity

column will say "" for the +olt 8, "" for the nut 8,

https://en.wikipedia.org/wiki/United_States_Armyhttps://en.wikipedia.org/wiki/United_States_Armyhttps://en.wikipedia.org/wiki/United_States_Navyhttps://en.wikipedia.org/wiki/Standardizationhttps://en.wikipedia.org/wiki/Standardizationhttps://en.wikipedia.org/wiki/Logisticshttps://en.wikipedia.org/wiki/Logisticshttps://en.wikipedia.org/wiki/United_States_Military_Standardhttps://en.wikipedia.org/wiki/International_Organization_for_Standardizationhttps://en.wikipedia.org/wiki/International_Organization_for_Standardizationhttps://en.wikipedia.org/wiki/Specificationhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#DODhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#DODhttps://en.wikipedia.org/wiki/United_States_Military_Standard#Origins_and_evolutionhttps://en.wikipedia.org/wiki/United_States_Military_Standard#Origins_and_evolutionhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MIL-https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MIL-https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MS-https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#NAShttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#NAShttps://en.wikipedia.org/wiki/Annealing_(metallurgy)https://en.wikipedia.org/wiki/Annealing_(metallurgy)https://en.wikipedia.org/wiki/American_National_Standards_Institutehttps://en.wikipedia.org/wiki/American_National_Standards_Institutehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#cite_note-orau-2https://en.wikipedia.org/wiki/Acceptable_quality_levelhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#PLhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#LMhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#LMhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#LMhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#BoMhttps://en.wikipedia.org/wiki/Bolted_jointhttps://en.wikipedia.org/wiki/Bolted_jointhttps://en.wikipedia.org/wiki/Bolted_jointhttps://en.wikipedia.org/wiki/United_States_Armyhttps://en.wikipedia.org/wiki/United_States_Navyhttps://en.wikipedia.org/wiki/Standardizationhttps://en.wikipedia.org/wiki/Logisticshttps://en.wikipedia.org/wiki/United_States_Military_Standardhttps://en.wikipedia.org/wiki/International_Organization_for_Standardizationhttps://en.wikipedia.org/wiki/Specificationhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#DODhttps://en.wikipedia.org/wiki/United_States_Military_Standard#Origins_and_evolutionhttps://en.wikipedia.org/wiki/United_States_Military_Standard#Origins_and_evolutionhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MIL-https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MS-https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#NAShttps://en.wikipedia.org/wiki/Annealing_(metallurgy)https://en.wikipedia.org/wiki/American_National_Standards_Institutehttps://en.wikipedia.org/wiki/American_National_Standards_Institutehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#cite_note-orau-2https://en.wikipedia.org/wiki/Acceptable_quality_levelhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#PLhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#LMhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#BoMhttps://en.wikipedia.org/wiki/Bolted_joint


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-su+part -"piece part", "detail part".

AST( Formerly the American

Society for Testing and

(aterials? now AST(

International

(aintains technical standards, especially

regarding materials science and

engineering and metrology.

ABG average

AG American ire Gauge

B

@ASIC

+asic dimension

A +asic dimension is one that is the theoretical value

without any tolerance range. It does not serve as an

acceptance criterion. It is thus similar in some

respects to a reference dimension. The reason why a

+asic dimension does not carry a tolerance is that its

actual value will fall -accepta+ly wherever it is put +y

other featuresE actual values, where the latter

features are the ones with tolerances defined. A

common and simple example is hole locationH If a

holeEs centerpoint location has a position tolerance,

then the centerpointEs coordinates do not need -and

should not have separate tolerances applied to

them. Thus they are instead given as +asic

dimensions. In modern practice +asic dimensions

have a rectangular +ox around them, or sometimes

the word "@ASIC".

@C or @.C. +olt circle

https://en.wikipedia.org/wiki/ASTM_Internationalhttps://en.wikipedia.org/wiki/ASTM_Internationalhttps://en.wikipedia.org/wiki/ASTM_Internationalhttps://en.wikipedia.org/wiki/Technical_standardhttps://en.wikipedia.org/wiki/Technical_standardhttps://en.wikipedia.org/wiki/Materials_science_and_engineeringhttps://en.wikipedia.org/wiki/Materials_science_and_engineeringhttps://en.wikipedia.org/wiki/Materials_science_and_engineeringhttps://en.wikipedia.org/wiki/Metrologyhttps://en.wikipedia.org/wiki/Averagehttps://en.wikipedia.org/wiki/American_Wire_Gaugehttps://en.wikipedia.org/wiki/Basic_dimensionhttps://en.wikipedia.org/wiki/Basic_dimensionhttps://en.wikipedia.org/wiki/Basic_dimensionhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#REFhttps://en.wikipedia.org/wiki/Position_tolerancehttps://en.wiktionary.org/wiki/bolt_circlehttps://en.wikipedia.org/wiki/ASTM_Internationalhttps://en.wikipedia.org/wiki/ASTM_Internationalhttps://en.wikipedia.org/wiki/Technical_standardhttps://en.wikipedia.org/wiki/Materials_science_and_engineeringhttps://en.wikipedia.org/wiki/Materials_science_and_engineeringhttps://en.wikipedia.org/wiki/Metrologyhttps://en.wikipedia.org/wiki/Averagehttps://en.wikipedia.org/wiki/American_Wire_Gaugehttps://en.wikipedia.org/wiki/Basic_dimensionhttps://en.wikipedia.org/wiki/Basic_dimensionhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#REFhttps://en.wikipedia.org/wiki/Position_tolerancehttps://en.wiktionary.org/wiki/bolt_circle


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@CS +utton head cap screw &ie an SCS +ut with a +utton head.

@ @rinell hardness

num+er

@o( or @4(

+ill of materials

Also called a list of materials -&( or &D(. 4verlaps a

lot in concept with a parts list -8& or 8D&. There is no

consistently enforced distinction +etween an &D(, a

@o(, or a 8D&.

@8, @D8 +lueprint "per @D8" J "per drawing"

@)6 +ron3e

@SC +asic dimension See +asic dimension info a+ove.

C

CA/ computer%aided design,

computer%aided

drafting?cadmium

:plating<

CAG# Commercial and

Government

#ntity:code<

A CAG# code is a uni>ue identifier to la+el an entity

-that is, a specific government agency or corporation

at a specific site that is aC/A, 4/A, or (F) of the

part defined +y the drawing. 4ne corporation can

have many CAG# codes, as can one government,

+ecause each division, department, and site

-campus can have its own CAG# code. The same

CAG# code can change owners over the years. For

https://en.wikipedia.org/wiki/List_of_screw_drives#Hex_sockethttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#SHCShttps://en.wikipedia.org/wiki/Screw#Screw_head_shapeshttps://en.wikipedia.org/wiki/Screw#Screw_head_shapeshttps://en.wikipedia.org/wiki/Brinell_scalehttps://en.wikipedia.org/wiki/Brinell_scalehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#LMhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#LMhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#PLhttps://en.wikipedia.org/wiki/Bronzehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#BASIChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#BASIChttps://en.wikipedia.org/wiki/Computer-aided_designhttps://en.wikipedia.org/wiki/Plating#Cadmium_platinghttps://en.wikipedia.org/wiki/Plating#Cadmium_platinghttps://en.wikipedia.org/wiki/Commercial_and_Government_Entityhttps://en.wikipedia.org/wiki/Commercial_and_Government_Entityhttps://en.wikipedia.org/wiki/Commercial_and_Government_Entityhttps://en.wikipedia.org/wiki/Unique_identifierhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#CDAhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#ODAhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MFRhttps://en.wikipedia.org/wiki/List_of_screw_drives#Hex_sockethttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#SHCShttps://en.wikipedia.org/wiki/Screw#Screw_head_shapeshttps://en.wikipedia.org/wiki/Brinell_scalehttps://en.wikipedia.org/wiki/Brinell_scalehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#LMhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#PLhttps://en.wikipedia.org/wiki/Bronzehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#BASIChttps://en.wikipedia.org/wiki/Computer-aided_designhttps://en.wikipedia.org/wiki/Plating#Cadmium_platinghttps://en.wikipedia.org/wiki/Plating#Cadmium_platinghttps://en.wikipedia.org/wiki/Commercial_and_Government_Entityhttps://en.wikipedia.org/wiki/Commercial_and_Government_Entityhttps://en.wikipedia.org/wiki/Commercial_and_Government_Entityhttps://en.wikipedia.org/wiki/Unique_identifierhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#CDAhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#ODAhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MFR


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example, a CAG# code that formerly referred to a

certain (artin (arietta site will now refer to &ocheed

(artin at that same site -although the +uildings may

have +een replaced and the signage may saydifferent names.

C%C or C%T4%C centre%to%centre? on

centres

/efines centre%to%centre distance of two features,

such as two holes.

C@ cu+ic +oron nitride A material from which some cutter inserts are made.

C/A

current design activity

The C/A is the entity -whether it +e a corporation, a

unit of a national military or ministry of defence, or

another civilian government agency that currently

has design authority over the part design -definition.

It may +e the entity who first designed the part -that

is, the4/A, +ut today it is also liely to +e a

designated successor entity, owing to mergers and

ac>uisitions -(KA activity -e.g., 4/A company was

+ought +y C/A company? contract letting -e.g., an Army engineering department 4/A turns over the

design activity to the prime contractor that maes

most or all of the parts, turning that contractor into

the new C/A? privati3ation -e.g., a government

privati3es the design and manufacture of materiel,

and a state arsenal :state armory< 4/A transfers

design authority to a private armory :defense

contractor < 4/A? or patent licensing -e.g., a patent%

holding inventor :4/A< licenses one or severalcompanies to manufacture products using his

intellectual property, in which case the "same" part

could end up with multiple design authorities,

although they may not +e considered the

officialDnominal C/A.

https://en.wikipedia.org/wiki/Martin_Mariettahttps://en.wikipedia.org/wiki/Martin_Mariettahttps://en.wikipedia.org/wiki/Lockheed_Martinhttps://en.wikipedia.org/wiki/Lockheed_Martinhttps://en.wikipedia.org/wiki/Lockheed_Martinhttps://en.wikipedia.org/wiki/Lockheed_Martinhttps://en.wikipedia.org/wiki/Boron_nitride#Cubic_boron_nitridehttps://en.wikipedia.org/wiki/Tipped_toolhttps://en.wikipedia.org/wiki/Corporationhttps://en.wikipedia.org/wiki/Militaryhttps://en.wikipedia.org/wiki/Militaryhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#ODAhttps://en.wikipedia.org/wiki/Mergers_and_acquisitionshttps://en.wikipedia.org/wiki/Mergers_and_acquisitionshttps://en.wikipedia.org/wiki/Privatizationhttps://en.wikipedia.org/wiki/Privatizationhttps://en.wikipedia.org/wiki/Materielhttps://en.wikipedia.org/wiki/Arsenalhttps://en.wikipedia.org/wiki/Arsenalhttps://en.wikipedia.org/wiki/Armory_(military)https://en.wikipedia.org/wiki/Armory_(military)https://en.wikipedia.org/wiki/Armory_(military)https://en.wikipedia.org/wiki/Defense_contractorhttps://en.wikipedia.org/wiki/Defense_contractorhttps://en.wikipedia.org/wiki/Defense_contractorhttps://en.wikipedia.org/wiki/Martin_Mariettahttps://en.wikipedia.org/wiki/Lockheed_Martinhttps://en.wikipedia.org/wiki/Lockheed_Martinhttps://en.wikipedia.org/wiki/Boron_nitride#Cubic_boron_nitridehttps://en.wikipedia.org/wiki/Tipped_toolhttps://en.wikipedia.org/wiki/Corporationhttps://en.wikipedia.org/wiki/Militaryhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#ODAhttps://en.wikipedia.org/wiki/Mergers_and_acquisitionshttps://en.wikipedia.org/wiki/Mergers_and_acquisitionshttps://en.wikipedia.org/wiki/Privatizationhttps://en.wikipedia.org/wiki/Materielhttps://en.wikipedia.org/wiki/Arsenalhttps://en.wikipedia.org/wiki/Armory_(military)https://en.wikipedia.org/wiki/Armory_(military)https://en.wikipedia.org/wiki/Defense_contractorhttps://en.wikipedia.org/wiki/Defense_contractor


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C#)T or certcertification

For example, certification of metallurgical content

and processes

CG centerless

ground,centerless

grinding

Center mar /efines the center of a circle or partial circle.

C chamfer

CA( chamfer

CIcast iron

o longer a commonly used a++reviation. @etter to

spell out for clarity.

C& or ℄

center line? class

!. Center line, the central axis of a feature. ;. Class,

for example, "paint per spec 9'6 revision C type !

class ;" may +e a++reviated as "paint per spec 9'6

)#B C T' ! C& ;" or even in some cases "paint per

spec 9'6%C%!%;". -The latter practice is not

uncommon +ut iscryptic for worers with minimal

training and experience. The first two options are

+etter practice.

CC computer numericalcontrol

C) controlled radius )adius of an arc or circle, with no flats or reversals.

This strict version of radius definition is specified in

demanding applications when the form of the radius

https://en.wikipedia.org/wiki/Certificationhttps://en.wikipedia.org/wiki/Centerless_grindinghttps://en.wikipedia.org/wiki/Centerless_grindinghttps://en.wikipedia.org/wiki/Centerless_grindinghttps://en.wiktionary.org/wiki/center_markhttps://en.wikipedia.org/wiki/Chamferhttps://en.wikipedia.org/wiki/Chamferhttps://en.wikipedia.org/wiki/Cast_ironhttps://en.wiktionary.org/wiki/center_linehttps://en.wiktionary.org/wiki/center_linehttps://en.wiktionary.org/wiki/cryptichttps://en.wiktionary.org/wiki/cryptichttps://en.wikipedia.org/wiki/Numerical_controlhttps://en.wikipedia.org/wiki/Numerical_controlhttps://en.wikipedia.org/wiki/Certificationhttps://en.wikipedia.org/wiki/Centerless_grindinghttps://en.wikipedia.org/wiki/Centerless_grindinghttps://en.wiktionary.org/wiki/center_markhttps://en.wikipedia.org/wiki/Chamferhttps://en.wikipedia.org/wiki/Chamferhttps://en.wikipedia.org/wiki/Cast_ironhttps://en.wiktionary.org/wiki/center_linehttps://en.wiktionary.org/wiki/cryptichttps://en.wikipedia.org/wiki/Numerical_controlhttps://en.wikipedia.org/wiki/Numerical_control


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must +e controlled more strictly than "$ust falling

within the dimensional tolerance 3one". It is poor

engineering to specify a C) instead of an ) simply

on the theory of enforcing good wormanship. C) isfor critical features whose performance truly re>uires

near%perfect geometry. &ie most such

characteristics, its presence increases the price of

the part, +ecause it raises the costs of manufacturing

and >uality assurance.

C)#S

corrosion%resistant

:steel<

&argely synonymous with stainless steel, unless

specific grades, specs, and distinctions are made on

the drawing. Some people treat C)#S as a su+set of

the stainless steels.

C)S cold rolled steel? on

centres

/efines centre%to%centre distance of two features,

such as two holes.

CE@4)# or

C@4)# or

counter+ore

CSL or

CSIL orcountersin

CT, ctn carton

D

depth, deep, down /efines the depth of a feature.

https://en.wikipedia.org/wiki/Stainless_steelhttps://en.wikipedia.org/wiki/Cold_rolled_steelhttps://en.wikipedia.org/wiki/Counterborehttps://en.wikipedia.org/wiki/Countersinkhttps://en.wikipedia.org/wiki/Stainless_steelhttps://en.wikipedia.org/wiki/Cold_rolled_steelhttps://en.wikipedia.org/wiki/Counterborehttps://en.wikipedia.org/wiki/Countersink


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⌀:;<

diameter

/iameter of a circle. In a feature control frame -FCF,

the ⌀ sym+ol tells you that the tolerance 3one for the

geometric tolerance iscylindrical. A++reviations for

"diameter " include ⌀

, /IA, and /.

/diameter ? delta

A++reviations for "diameter " include ⌀, /IA, and /.

For delta usage, see for example "delta notes".

/IA:;<diameter

/iameter of a circle. A++reviations for "diameter "

include ⌀, /IA, and /.

/I( dimension,

dimensioning

/4, doditto

Seen occasionally in older drawings instead of

repeating a given dimension.

/4/, /o/ :*.S.< /epartment of

/efense See also (4/.

/8/ digital product definition A synonym of (@/.

/G, dwg drawing )eferring to the engineering drawing

E

#4, #C4, #C engineering order An order from the engineering department -to +e

followed +y the production department or vendor

overridingDsuperseding a detail on the drawing, which

gets superseded with revised information. Also called

https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#cite_note-orau-2https://en.wikipedia.org/wiki/Diameterhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#FCFhttps://en.wikipedia.org/wiki/Cylinder_(geometry)https://en.wikipedia.org/wiki/Diameterhttps://en.wikipedia.org/wiki/%E2%8C%80https://en.wikipedia.org/wiki/%E2%8C%80https://en.wikipedia.org/wiki/Diameterhttps://en.wikipedia.org/wiki/Delta_(letter)https://en.wikipedia.org/wiki/Delta_(letter)https://en.wikipedia.org/wiki/Diameterhttps://en.wikipedia.org/wiki/%E2%8C%80https://en.wikipedia.org/wiki/Engineering_drawing#Flagnoteshttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#cite_note-orau-2https://en.wikipedia.org/wiki/Diameterhttps://en.wikipedia.org/wiki/Diameterhttps://en.wikipedia.org/wiki/%E2%8C%80https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MODhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MODhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MBDhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MBDhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#cite_note-orau-2https://en.wikipedia.org/wiki/Diameterhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#FCFhttps://en.wikipedia.org/wiki/Cylinder_(geometry)https://en.wikipedia.org/wiki/Diameterhttps://en.wikipedia.org/wiki/%E2%8C%80https://en.wikipedia.org/wiki/Diameterhttps://en.wikipedia.org/wiki/Delta_(letter)https://en.wikipedia.org/wiki/Diameterhttps://en.wikipedia.org/wiki/%E2%8C%80https://en.wikipedia.org/wiki/Engineering_drawing#Flagnoteshttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#cite_note-orau-2https://en.wikipedia.org/wiki/Diameterhttps://en.wikipedia.org/wiki/Diameterhttps://en.wikipedia.org/wiki/%E2%8C%80https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MODhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MBD


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+y various other names, such as engineering change

order -#C4, engineering change notice -#C,

drawing change notice -/C, and so on. See

also )#B.

#=

e>ual, e>ually

For example, "⌀! 9 #= S8AC#/ 4 @C" means

"drill four holes of !mm diameter e>ually spaced

around the +olt circle."

F

f

finish

An italic f -&atin small letter f written on a line

representing a surface was an old way of indicating

that the surface was to +e machined rather than left

in the as%cast or as%forged state. The "f" came from

"finish" in the sense of "machine finish" as opposed

to raw stocDcastingDforging. &ater the ASA convened

upon a letter B -specifically a sans%serif B touching

the surface. Soon this evolved into the "chec mar"

sign with accompanying num+er that tells the readera max roughness value -)(S, microinches or

micrometres for the machined finish, to +e

measured with a profilometer.

FA4 finish all over A note telling the manufacturer that all surfaces of

the part are to +e machined -as opposed to leaving

any surfaces as%cast or as%forged. ot an o+solete

usage, +ut not seen as commonly as it was decades

ago? not least +ecause parts that once would have

+een spot%faced castings are now lielier to +e

contoured from +illet with CC milling. @ut more

importantly, +est engineering practice today,

reflecting design for manufactura+ility and avoidance

of spurious cost drivers, is either to specify specific,

https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#REVhttps://en.wikipedia.org/wiki/%E2%8C%80https://en.wiktionary.org/wiki/bolt_circlehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#v_meaning_finishhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#v_meaning_finishhttps://en.wikipedia.org/wiki/Sans-serifhttps://en.wikipedia.org/wiki/CNChttps://en.wikipedia.org/wiki/Design_for_manufacturabilityhttps://en.wikipedia.org/wiki/Design_for_manufacturabilityhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#REVhttps://en.wikipedia.org/wiki/%E2%8C%80https://en.wiktionary.org/wiki/bolt_circlehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#v_meaning_finishhttps://en.wikipedia.org/wiki/Sans-serifhttps://en.wikipedia.org/wiki/CNChttps://en.wikipedia.org/wiki/Design_for_manufacturability


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>uantifia+le re>uirements for surfaces with specific

needs -such as )(S roughness measurements in

microinches or micrometres, plus any plating or

painting needs, or to leave finish out of the partdefinition -and thus at the manufacturerEs discretion

+ecause it is not important to fit, function, or

criticality. This same spirit is +ehind the shift in

military standards from writing re>uirements a+out

methods to writing them instead a+out performance,

with the method to reach that goal +eing up to the

ingenuity of the designer.

FCF

feature control frame

The rectangular +ox -with several cells that conveys

geometric tolerances in G/KT. It typically tells you

what sort of geometric condition -e.g., parallel,

perpendicular, round, concentric, followed +y what

si3e -and may+e shape the tolerance 3one is, and

finally which datums it relates to, the order of gaging

against them, and what material condition applies to

them -&(C, ((C, or )FS. A diameter sym+ol -⌀

tells you that the 3one for the geometric tolerance

is cylindrical.

F/ or FD/

field of the drawing

The :main< field of the drawing, as opposed to other

areas of it, such as the parts list -8D&, general notes

-GD, flagnotes -FD or F&, title +loc -TD@, rev

+loc -)D@, +ill of materials -@D( or @o( or @4(, or

list of materials -&D(. )ationales for drawing

changes that are noted in the rev +loc often use

these a++reviations for +revity -e.g., "/I( !. was!;.2? added default T4& info to TD@? added leader

lines to FD/? added alternate hardware I/s to 8D&?

added alternate alloy to &D(".

FI( full indicator movement See also TI).

https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#GD.26Thttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#GD.26Thttps://en.wikipedia.org/wiki/Datum_(geodesy)https://en.wikipedia.org/wiki/Datum_(geodesy)https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#LMChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MMChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#RFShttps://en.wikipedia.org/wiki/%E2%8C%80https://en.wikipedia.org/wiki/Cylinder_(geometry)https://en.wikipedia.org/wiki/Cylinder_(geometry)https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#PLhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#FLhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#TBhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#REVhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#BoMhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#LMhttps://en.wikipedia.org/wiki/Total_indicator_readinghttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#TIRhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#GD.26Thttps://en.wikipedia.org/wiki/Datum_(geodesy)https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#LMChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MMChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#RFShttps://en.wikipedia.org/wiki/%E2%8C%80https://en.wikipedia.org/wiki/Cylinder_(geometry)https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#PLhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#FLhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#TBhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#REVhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#BoMhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#LMhttps://en.wikipedia.org/wiki/Total_indicator_readinghttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#TIR


12/36

F&

flag note, flagnote

A note that is called out in specific spots in the field

of the drawing. It is num+ered with a styli3ed flag

sym+ol surrounding the num+er. A general note

applies generally and is not called out with flags.

F or FD

flag note, flagnote? find

num+er

!. FlagnoteH A flagnote is a note that is called out in

specific spots in the field of the drawing. It is

num+ered with a styli3ed flag sym+ol surrounding the

num+er -or sometimes a delta sym+ol. A general

note applies generally and is not called out with

flags. ;. Find num+erH "F" meaning "find num+er"

refers to the ordinal num+er that gives an I/ tag to

one of the constituents in a parts list -list of materials,

+ill of materials. Thus "fasten using F7" refers to a

fastener that is "find num+er" 7 in the list.

FoS

feature of si3e

A type of physical feature on a part. An FoS is a

feature that can have si3e associated with it, usuallyinvolving the opposition of two surfaces -e.g., the two

diametrically opposite sides of a hole wall? the two

opposite walls of a slot or flange. Features of si3e

-FoSs in reality always have actual si3es and forms

that differ from their theoretical si3e and form? the

purpose of tolerancing is to define whether the

difference is accepta+le or not. Thus material

condition -&(C, ((C, somewhere in +etween,

or )FS is important inG/KT. A given geometrictolerance may +e defined in relation to a certain FoS

datum +eing at &(C or at ((C.

FS far side The drawing notations "near side" and "far side" tell

the reader which side of the part a feature is on, in

https://en.wikipedia.org/wiki/Engineering_drawing#Flagnoteshttps://en.wikipedia.org/wiki/Engineering_drawing#Flagnoteshttps://en.wikipedia.org/wiki/Engineering_drawing#Flagnoteshttps://en.wikipedia.org/wiki/Delta_(letter)https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#LMChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MMChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MMChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#RFShttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#GD.26Thttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#GD.26Thttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#NShttps://en.wikipedia.org/wiki/Engineering_drawing#Flagnoteshttps://en.wikipedia.org/wiki/Engineering_drawing#Flagnoteshttps://en.wikipedia.org/wiki/Delta_(letter)https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#LMChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MMChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#RFShttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#GD.26Thttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#NS


13/36

occasional contexts where that fact is not

communicated using the rules of pro$ection alone.

Contexts of usage are rather limited. 4ne example is

hole locations? "M9 A/ M9 FA) SI/#" definessymmetrical groups of M holes on +oth sides of a part

- total, without having to redefine e>uivalent hole

center coordinates on two separate views, one for

each group. This is not only a convenience for the

designer +ut also a method of error prevention,

+ecause it provides a way to avoid foring geometric

definition that ideally should +e ept unfored to

prevent discrepancies. For example, the groups

defined a+ove cannot accidentally +ecome

asymmetrically discrepant in a future revision +y the

revisor failing to revise +oth groups e>ually -+ecause

their definition is unified in only one place. Another

example is part maring locations. An area for part

identification maring can +e circled on a top view

+ut assigned to either the top or +ottom of the part

simply with a "near side" or "far side" notationN

which o+viates adding any otherwise%unneeded

+ottom view to the field of the drawing.

FSC( Federal StocDSupply

Code for (anufacturers

An older name for "CAG# code". Also SC(

-ational StocDSupply Code for (anufacturers.

G

GCI gray cast iron

G/KT or G/T geometric

dimensioning and

tolerancing

A standardi3ed language for defining and

communicating dimensions and tolerances.

https://en.wikipedia.org/wiki/Orthographic_projectionhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#REVhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#REVhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#CAGEhttps://en.wikipedia.org/wiki/Gray_cast_ironhttps://en.wikipedia.org/wiki/Geometric_dimensioning_and_tolerancinghttps://en.wikipedia.org/wiki/Geometric_dimensioning_and_tolerancinghttps://en.wikipedia.org/wiki/Geometric_dimensioning_and_tolerancinghttps://en.wikipedia.org/wiki/Orthographic_projectionhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#REVhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#CAGEhttps://en.wikipedia.org/wiki/Gray_cast_ironhttps://en.wikipedia.org/wiki/Geometric_dimensioning_and_tolerancinghttps://en.wikipedia.org/wiki/Geometric_dimensioning_and_tolerancinghttps://en.wikipedia.org/wiki/Geometric_dimensioning_and_tolerancing


14/36

G or GDgeneral note-s

(ost engineering drawings have a notes list, which

includes +oth general notes and flag notes.

H

@hardness, @rinell,

tungsten tip

See @rinell scale. -The "" comes from the element

sym+ol for tungsten, , which comes from the

German Wolfram.

CS hex head cap screw

)A hardness, )ocwell, A

scaleSee )ocwell scale.

)@ hardness, )ocwell, @


)C hardness, )ocwell, C


)S hot rolled steel

T T) heat treat, heat

treatment

KT or DT or

T

hardened and

tempered

A form of heat treatment in which the metal is

first hardened and then tempered. Compare KT.

I

https://en.wikipedia.org/wiki/Brinell_scalehttps://en.wikipedia.org/wiki/Brinell_scalehttps://en.wikipedia.org/wiki/Tungstenhttps://en.wikipedia.org/wiki/Tungstenhttps://en.wikipedia.org/wiki/List_of_screw_drives#Hexhttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scalehttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scalehttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scalehttps://en.wikipedia.org/wiki/Hot_rolled_steelhttps://en.wikipedia.org/wiki/Heat_treatmenthttps://en.wikipedia.org/wiki/Heat_treatmenthttps://en.wikipedia.org/wiki/Heat_treatmenthttps://en.wikipedia.org/wiki/Hardening_(metallurgy)https://en.wikipedia.org/wiki/Hardening_(metallurgy)https://en.wikipedia.org/wiki/Tempering_(metallurgy)https://en.wikipedia.org/wiki/Tempering_(metallurgy)https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#N.26Thttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#N.26Thttps://en.wikipedia.org/wiki/Brinell_scalehttps://en.wikipedia.org/wiki/Tungstenhttps://en.wikipedia.org/wiki/List_of_screw_drives#Hexhttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scalehttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scalehttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scalehttps://en.wikipedia.org/wiki/Hot_rolled_steelhttps://en.wikipedia.org/wiki/Heat_treatmenthttps://en.wikipedia.org/wiki/Heat_treatmenthttps://en.wikipedia.org/wiki/Heat_treatmenthttps://en.wikipedia.org/wiki/Hardening_(metallurgy)https://en.wikipedia.org/wiki/Tempering_(metallurgy)https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#N.26T


15/36

IA in accordance with

A common need in engineering drawings is to

instruct the user to do activity 9 in accordance

with technical standard '. For example, "eld all

su+assem+lies IA AS 9'6.!;M" means "eld allsu+assem+lies in accordance with American elding

Society standard num+er 9'6.!;M" -the num+er is

hypothetical in this example. The word "per" is

functionally e>uivalent to "IA" in such contexts?

thus "rivet all sheet metal per (I&%8)F%!;M2" or

":...< IA (I&%8)F%!;M2". 8art of the motivation

+ehind the choice of words "in accordance with" is

that they do not allege that any particular activity

is explicitly specified +y standard 9'6.!;M -which

"per" could +e interpreted as alleging, at least

in connotation? rather, these words merely instruct

the user that whatever sDhe does must

notcontradict the standard in any way. @ut this is a

su+tle connotative distinction, and "per" and "IA"

are denotatively e>uivalent.

I/ inner diameter? identity,

identification num+er

IS4 International

4rgani3ation for

Standardi3ation

And the many standards that it specifies, for

example, IS4 !MM

J

K

L#' ey /rawing callouts mared "L#'" define "ey

characteristics" that are considered especially

https://en.wikipedia.org/wiki/Technical_standardhttps://en.wikipedia.org/wiki/American_Welding_Societyhttps://en.wikipedia.org/wiki/American_Welding_Societyhttps://en.wikipedia.org/wiki/American_Welding_Societyhttps://en.wikipedia.org/wiki/Connotationhttps://en.wikipedia.org/wiki/Denotationhttps://en.wikipedia.org/wiki/Denotationhttps://en.wikipedia.org/wiki/International_Organization_for_Standardizationhttps://en.wikipedia.org/wiki/International_Organization_for_Standardizationhttps://en.wikipedia.org/wiki/International_Organization_for_Standardizationhttps://en.wikipedia.org/wiki/ISO_10303https://en.wikipedia.org/wiki/ISO_10303https://en.wikipedia.org/wiki/Technical_standardhttps://en.wikipedia.org/wiki/American_Welding_Societyhttps://en.wikipedia.org/wiki/American_Welding_Societyhttps://en.wikipedia.org/wiki/Connotationhttps://en.wikipedia.org/wiki/Denotationhttps://en.wikipedia.org/wiki/International_Organization_for_Standardizationhttps://en.wikipedia.org/wiki/International_Organization_for_Standardizationhttps://en.wikipedia.org/wiki/International_Organization_for_Standardizationhttps://en.wikipedia.org/wiki/ISO_10303


16/36

important for fit, function, safety, or other reasons.

They are thus su+$ected to higher inspection

sampling levels.

L8SI, psi ilopounds per s>uare

inch, that is, thousands

of pounds per s>uare

inch

See discussion at synonym LSI.

LSI, si

ilopounds per s>uare

inch, that is, thousands

of pounds per s>uare

inch

LSI -or si, also a++reviated L8SI or psi, is a

common non%SI measurement scale for ultimate

tensile strength, that is, the num+er of units of tensile

force that a material can endure per unit of cross%

sectional area +efore +reaing. In the SI system, the

unit is the pascal-8a -or a multiple thereof, often

megapascals -(8a, using the mega% prefix? or,

e>uivalently to pascals, newtons per s>uare metre

-DmO.

&

left%hand

)eferring to handedness, such as the helix

handedness of screw threads or the mirror%image

handedness of a symmetrical pair of parts.

&( or &D(

list of materials

Also called a +ill of materials -@o(, @4(. 4verlaps

a lot in concept with a parts list -8& or 8D&. There is

no consistently enforced distinction +etween an &D(,

a @o(, or a 8D&.

&(C least material condition A material condition in G/KT. (eans that a feature

of si3e -FoS is at the limit of its si3e tolerance in the

https://en.wikipedia.org/wiki/Pounds_per_square_inchhttps://en.wikipedia.org/wiki/Pounds_per_square_inchhttps://en.wikipedia.org/wiki/Pounds_per_square_inchhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#KSIhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#KSIhttps://en.wikipedia.org/wiki/Pounds_per_square_inchhttps://en.wikipedia.org/wiki/Pounds_per_square_inchhttps://en.wikipedia.org/wiki/Pounds_per_square_inchhttps://en.wikipedia.org/wiki/International_System_of_Unitshttps://en.wikipedia.org/wiki/International_System_of_Unitshttps://en.wikipedia.org/wiki/Ultimate_tensile_strengthhttps://en.wikipedia.org/wiki/Ultimate_tensile_strengthhttps://en.wikipedia.org/wiki/Ultimate_tensile_strengthhttps://en.wikipedia.org/wiki/SIhttps://en.wikipedia.org/wiki/SIhttps://en.wikipedia.org/wiki/Pascal_(unit)https://en.wikipedia.org/wiki/SI_prefixhttps://en.wikipedia.org/wiki/Newton_(unit)https://en.wikipedia.org/wiki/Newton_(unit)https://en.wikipedia.org/wiki/Handednesshttps://en.wikipedia.org/wiki/Screw_thread#Handednesshttps://en.wikipedia.org/wiki/Screw_thread#Handednesshttps://en.wikipedia.org/wiki/Screw_thread#Handednesshttps://en.wikipedia.org/wiki/Screw_thread#Handednesshttps://en.wikipedia.org/wiki/Symmetryhttps://en.wikipedia.org/wiki/Symmetryhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#BoMhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#BoMhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#PLhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#PLhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#GD.26Thttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#FoShttps://en.wikipedia.org/wiki/Pounds_per_square_inchhttps://en.wikipedia.org/wiki/Pounds_per_square_inchhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#KSIhttps://en.wikipedia.org/wiki/Pounds_per_square_inchhttps://en.wikipedia.org/wiki/Pounds_per_square_inchhttps://en.wikipedia.org/wiki/International_System_of_Unitshttps://en.wikipedia.org/wiki/Ultimate_tensile_strengthhttps://en.wikipedia.org/wiki/Ultimate_tensile_strengthhttps://en.wikipedia.org/wiki/SIhttps://en.wikipedia.org/wiki/Pascal_(unit)https://en.wikipedia.org/wiki/SI_prefixhttps://en.wikipedia.org/wiki/Newton_(unit)https://en.wikipedia.org/wiki/Handednesshttps://en.wikipedia.org/wiki/Screw_thread#Handednesshttps://en.wikipedia.org/wiki/Screw_thread#Handednesshttps://en.wikipedia.org/wiki/Symmetryhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#BoMhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#PLhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#GD.26Thttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#FoS


17/36

direction that leaves the least material left on the

part. Thus an internal feature of si3e -e.g., a hole at

its +iggest diameter, or an external feature of si3e

-e.g., aflange at its smallest thicness. The G/KTsym+ol for &(C is a circled &. -See

also ((C and )FS. A given geometric tolerance

may +e defined in relation to a certain FoS datum

+eing at &(C or at ((C.

!

(AC machine? machined

(APma$or

As in ma$or diameter , or ma$or characteristic -for

sampling level

(A9:;< maximum

(@/

model%+ased definition

/efinition of the part via a M/ CA/ model rather than

via a ;/ engineering drawing. /rawings may +e

printed -plotted from the model for reference use,

+ut the model remains the governing legal

instrument.

(@8 measurement +etween

pins

threads, splines, gears -internal, female

-synonymous with (@ -see also (48, (4

(@ measurement +etween

wires

threads, splines, gears -internal, female -see

also (@8, (48, (4

(F or (DF mae from hen one part num+er is made from another, it

https://en.wikipedia.org/wiki/Flangehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MMChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MMChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#RFShttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#RFShttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#FoShttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#FoShttps://en.wikipedia.org/wiki/Major_diameterhttps://en.wikipedia.org/wiki/Major_diameterhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#cite_note-orau-2https://en.wikipedia.org/wiki/Maxima_and_minimahttps://en.wikipedia.org/wiki/Model-based_definitionhttps://en.wikipedia.org/wiki/Computer-aided_designhttps://en.wikipedia.org/wiki/Computer-aided_designhttps://en.wikipedia.org/wiki/Legal_instrumenthttps://en.wikipedia.org/wiki/Legal_instrumenthttps://en.wikipedia.org/wiki/Legal_instrumenthttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MBWhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MOPhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MOWhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MOWhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MBPhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MOPhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MOWhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MOWhttps://en.wikipedia.org/wiki/Flangehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MMChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#RFShttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#FoShttps://en.wikipedia.org/wiki/Major_diameterhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#cite_note-orau-2https://en.wikipedia.org/wiki/Maxima_and_minimahttps://en.wikipedia.org/wiki/Model-based_definitionhttps://en.wikipedia.org/wiki/Computer-aided_designhttps://en.wikipedia.org/wiki/Legal_instrumenthttps://en.wikipedia.org/wiki/Legal_instrumenthttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MBWhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MOPhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MOWhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MBPhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MOPhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MOW


18/36


19/36

:*.L. and others<

(48, (o8measurement over pins

threads, splines, gears -external, male -synonymous

with (4, measurement over wires

(4, (o measurement over

wires

threads, splines, gears -external, male -see

also (@, (@8, (48

(8a, (8A

megapascals

The common SI measurement scale for ultimate

tensile strength -*TS, that is, the num+er of units of

tensile force that a material can endure per unit ofcross%sectional area +efore +reaing. There is only

one correct casing for the sym+ol, cap%(%cap%8%

small%a, which, lie any SI unit of measurement

sym+ol, properly should +e preserved even when

surrounding text is styled in all caps -which latter is a

fre>uently employed tradition in engineering

drawing. @ut it is not uncommon to see "(8A"

through carelessness. *sers are not confused

regardless. In non%SI terms, the unit for *TS isthe LSI -or si, which see herein.

()@

material review +oard

A committee that reviews some nonconforming

materials which are su+mitted as potentially still

usa+leDsalea+le -if the nonconformance does not

hinder fit or function.

(S%

:*.S.< (ilitary Standard

Standards esta+lished +y the *.S. military and widely

used in the aerospace manufacturing -military and

civil and other defenseindustries. Standard

hardware sometimes uses the (S% prefix in the

catalog num+ers. -See also A% and AS.

https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MOWhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MBWhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MBPhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MBPhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MOPhttps://en.wikipedia.org/wiki/Pascal_(unit)https://en.wikipedia.org/wiki/International_System_of_Unitshttps://en.wikipedia.org/wiki/International_System_of_Unitshttps://en.wikipedia.org/wiki/Ultimate_tensile_strengthhttps://en.wikipedia.org/wiki/Ultimate_tensile_strengthhttps://en.wikipedia.org/wiki/Ultimate_tensile_strengthhttps://en.wikipedia.org/wiki/All_capshttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#KSIhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#KSIhttps://en.wikipedia.org/wiki/United_States_Military_Standardhttps://en.wikipedia.org/wiki/Aerospace_manufacturerhttps://en.wikipedia.org/wiki/Aerospace_manufacturerhttps://en.wikipedia.org/wiki/Defense_contractorhttps://en.wikipedia.org/wiki/Defense_contractorhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#AN-https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#NAShttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MOWhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MBWhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MBPhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MOPhttps://en.wikipedia.org/wiki/Pascal_(unit)https://en.wikipedia.org/wiki/International_System_of_Unitshttps://en.wikipedia.org/wiki/Ultimate_tensile_strengthhttps://en.wikipedia.org/wiki/Ultimate_tensile_strengthhttps://en.wikipedia.org/wiki/All_capshttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#KSIhttps://en.wikipedia.org/wiki/United_States_Military_Standardhttps://en.wikipedia.org/wiki/Aerospace_manufacturerhttps://en.wikipedia.org/wiki/Defense_contractorhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#AN-https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#NAS


20/36

"

AS

ational Aerospace

Standards

Standards maintained +y SA# International and

widely used in the aerospace

manufacturing industries. The "ational" formerly

implicitly referenced the *SA, +ut today AS and

other standards are used glo+ally. Standard

hardware for aerospace wor sometimes uses the

AS% prefix in the catalog num+ers. -See

also A% and (S%.

C ational

Coarse?numerical

control

The :*.S.< ational Coarse series of pre%!11

corresponds today to the *nified ational Coarse

-*C of the *nified Thread Standard.

C(

nonconforming

material-s

This a++reviation is used in a machine shop when

recording nonconformances -out of tolerance, etc..

For example, "An C( tag was tied to the scrap

part."

C)

nonconformance report

A report listing nonconformances -out of tolerance,

etc.. elps to analy3e system weanesses -such as

worn%out e>uipment, operators in need of more

training, or risy practices.

#Cnot elsewhere

classified? ational#lectrical Code

In the sense of "not elsewhere classified", the

a++reviation is well%nown within certain fields, +ut

not others? to avoid confusion, spell out. The ational

#lectrical Code is a standard for electrical wor.

#F ational #xtra Fine The :*.S.< ational #xtra Fine series of pre%!11

corresponds today to the *nified ational #xtra Fine

https://en.wikipedia.org/wiki/SAE_Internationalhttps://en.wikipedia.org/wiki/Aerospace_manufacturerhttps://en.wikipedia.org/wiki/Aerospace_manufacturerhttps://en.wikipedia.org/wiki/Aerospace_manufacturerhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#AN-https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#AN-https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MS-https://en.wikipedia.org/wiki/Numerical_controlhttps://en.wikipedia.org/wiki/Numerical_controlhttps://en.wikipedia.org/wiki/Numerical_controlhttps://en.wikipedia.org/wiki/Unified_Thread_Standardhttps://en.wikipedia.org/wiki/Riskhttps://en.wikipedia.org/wiki/Riskhttps://en.wikipedia.org/wiki/Riskhttps://en.wikipedia.org/wiki/National_Electrical_Codehttps://en.wikipedia.org/wiki/National_Electrical_Codehttps://en.wikipedia.org/wiki/National_Electrical_Codehttps://en.wikipedia.org/wiki/National_Electrical_Codehttps://en.wikipedia.org/wiki/SAE_Internationalhttps://en.wikipedia.org/wiki/Aerospace_manufacturerhttps://en.wikipedia.org/wiki/Aerospace_manufacturerhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#AN-https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MS-https://en.wikipedia.org/wiki/Numerical_controlhttps://en.wikipedia.org/wiki/Numerical_controlhttps://en.wikipedia.org/wiki/Unified_Thread_Standardhttps://en.wikipedia.org/wiki/Riskhttps://en.wikipedia.org/wiki/National_Electrical_Codehttps://en.wikipedia.org/wiki/National_Electrical_Codehttps://en.wikipedia.org/wiki/National_Electrical_Codehttps://en.wikipedia.org/wiki/National_Electrical_Code


21/36

-*#F of the *nified Thread Standard.

F

ational Fine

The :*.S.< ational Fine series of pre%!11

corresponds today to the *nified ational Fine -*F

of the *nified Thread Standard.

& or D&notes list

A list of notes that appears somewhere on the

drawing, often in the upper left corner.

4(:;< nominal

4)( or

4)(/normali3ed

referring to normali3ation, a stress%relieving heat

treatment. See also T T).

8S aval 8rimary

Standard:M<

-ot to +e confused with annotating strait pipe. This

should +e a++reviated 8S(, 8S& or 8S:


22/36

Code for (anufacturers -Federal StocDSupply Code for (anufacturers.

KT or DT or

T normali3ed and

tempered

A form of heat treatment in which the metal is

first normali3ed -stress%relieved and then tempered.

Compare KT.

TS not to scale See also #ngineering drawing 5 Scale.

#

4A& overall length

4Con center-s

That is, centre%to%centre? defines centre%to%centre

distance of two features, such as two holes.

4/ outer diameter

4/A

original design activity

The entity that originally designed a part. Compare

to C/A, the entity that currently has design authority

over the part design -definition.

4&

over high limit

This a++reviation is used in a machine shop when

recording nonconformances. For example, "part

scrapped +ecause I/ is 4&." See also *&&.

488opposite

See 8art num+er 5 Symmetrical parts for

explanation.

4)IG original

https://en.wikipedia.org/wiki/Heat_treatmenthttps://en.wikipedia.org/wiki/Annealing_(metallurgy)#Normalizationhttps://en.wikipedia.org/wiki/Annealing_(metallurgy)#Normalizationhttps://en.wikipedia.org/wiki/Tempering_(metallurgy)https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#H.26Thttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#H.26Thttps://en.wikipedia.org/wiki/Engineering_drawing#Scalehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#C-C_or_C-TO-Chttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#C-C_or_C-TO-Chttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#CDAhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#IDhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#IDhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#ULLhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#ULLhttps://en.wikipedia.org/wiki/Part_number#Symmetrical_partshttps://en.wikipedia.org/wiki/Heat_treatmenthttps://en.wikipedia.org/wiki/Annealing_(metallurgy)#Normalizationhttps://en.wikipedia.org/wiki/Tempering_(metallurgy)https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#H.26Thttps://en.wikipedia.org/wiki/Engineering_drawing#Scalehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#C-C_or_C-TO-Chttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#CDAhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#IDhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#ULLhttps://en.wikipedia.org/wiki/Part_number#Symmetrical_parts


23/36

$

pc, pcs piece, pieces

8/ pitch diameter

8/(, 8/(S product data

management, product

data manager :appuotes, 84s, e%mails, faxes, photos, word processordocuments, spreadsheets. See also 8&(.

8 or 8D precipitation hardening,

precipitation%hardened?

pilot hole

8) @)6 phosphor +ron3e

8& or 8D&

parts list

A list, usually ta+ular and often on the drawing -if not

accompanying the drawing on a separate sheet,

listing the parts needed in an assem+ly, including

su+parts, standard parts, and hardware. There is no

consistently enforced distinction +etween an &D(,

a @o(, or a8D&.

8&( product lifecycle

management? plant

lifecycle management

See also 8/(.

8 or 8D part num+er

https://en.wikipedia.org/wiki/Screw_thread#Pitch_diameterhttps://en.wikipedia.org/wiki/Product_data_managementhttps://en.wikipedia.org/wiki/Product_data_managementhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#PLMhttps://en.wikipedia.org/wiki/Precipitation_hardeninghttps://en.wikipedia.org/wiki/Pilot_holehttps://en.wikipedia.org/wiki/Phosphor_bronzehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#BoMhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#BoMhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#PLhttps://en.wikipedia.org/wiki/Product_lifecycle_managementhttps://en.wikipedia.org/wiki/Product_lifecycle_managementhttps://en.wikipedia.org/wiki/Plant_lifecycle_managementhttps://en.wikipedia.org/wiki/Plant_lifecycle_managementhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#PDMhttps://en.wikipedia.org/wiki/Part_numberhttps://en.wikipedia.org/wiki/Screw_thread#Pitch_diameterhttps://en.wikipedia.org/wiki/Product_data_managementhttps://en.wikipedia.org/wiki/Product_data_managementhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#PLMhttps://en.wikipedia.org/wiki/Precipitation_hardeninghttps://en.wikipedia.org/wiki/Pilot_holehttps://en.wikipedia.org/wiki/Phosphor_bronzehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#BoMhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#PLhttps://en.wikipedia.org/wiki/Product_lifecycle_managementhttps://en.wikipedia.org/wiki/Product_lifecycle_managementhttps://en.wikipedia.org/wiki/Plant_lifecycle_managementhttps://en.wikipedia.org/wiki/Plant_lifecycle_managementhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#PDMhttps://en.wikipedia.org/wiki/Part_number


24/36

84I

point of intersection

A point that maes easier the layout, toolpath

programming, or inspection of the part. It is

the intersection point of lines that may not meet on

the finished part, such as the tangent lines of

a curve or the theoretical sharp corner

-TSC that edge%+reaing and de+urringwill remove.

See also SC, TSC, and AC.

8SI pounds per s>uare inch A unit of measurement for pressure. See also LSI.

8TF# polytetrafluoroethylene Also well nown +y the +rand name Teflon.

%

=(S

>uality management

system

A system in place to ensure that >uality of

manufacture is produced and maintained? a system

to prevent defective parts from +eing made, or, even

if made, from getting into finished inventories.

=T' or >ty >uantity

&

)

radius

)adius of an arc or circle. Flats and reversals -falling

within the dimensional tolerance 3one are tolerated

unless "C)" -controlled radius is explicitly specified.

)A, )a roughness, See surface roughness? see )ocwell scale.

https://en.wikipedia.org/wiki/Marking_outhttps://en.wikipedia.org/wiki/Marking_outhttps://en.wikipedia.org/wiki/Line-line_intersectionhttps://en.wikipedia.org/wiki/Line-line_intersectionhttps://en.wikipedia.org/wiki/Line-line_intersectionhttps://en.wikipedia.org/wiki/Tangenthttps://en.wikipedia.org/wiki/Tangenthttps://en.wikipedia.org/wiki/Curvehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#TSChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#TSChttps://en.wikipedia.org/wiki/Burr_(edge)#Deburringhttps://en.wikipedia.org/wiki/Burr_(edge)#Deburringhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#SChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#SChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#TSChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#TSChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#AChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#AChttps://en.wikipedia.org/wiki/Pounds_per_square_inchhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#KSIhttps://en.wikipedia.org/wiki/Polytetrafluoroethylenehttps://en.wikipedia.org/wiki/Quality_management_systemhttps://en.wikipedia.org/wiki/Quality_management_systemhttps://en.wikipedia.org/wiki/Surface_roughnesshttps://en.wikipedia.org/wiki/Rockwell_scalehttps://en.wikipedia.org/wiki/Marking_outhttps://en.wikipedia.org/wiki/Line-line_intersectionhttps://en.wikipedia.org/wiki/Tangenthttps://en.wikipedia.org/wiki/Curvehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#TSChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#TSChttps://en.wikipedia.org/wiki/Burr_(edge)#Deburringhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#SChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#TSChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#AChttps://en.wikipedia.org/wiki/Pounds_per_square_inchhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#KSIhttps://en.wikipedia.org/wiki/Polytetrafluoroethylenehttps://en.wikipedia.org/wiki/Quality_management_systemhttps://en.wikipedia.org/wiki/Quality_management_systemhttps://en.wikipedia.org/wiki/Surface_roughnesshttps://en.wikipedia.org/wiki/Rockwell_scale


25/36

average?)ocwell A

scale

)@, )+ )ocwell @ scale See )ocwell scale.

)C, )c )ocwell C scale See )ocwell scale.

)#F or - :;<

reference

The dimension or note is given only for reference

and thus is not to +e used as a part acceptance

criterion -although it may +e used as an aid to

production or inspection. The dimension may also+e surrounded +y parentheses to signify a reference

dimension. hen a dimension is defined in one view

+ut also mentioned again in another view, it will +e

given as reference in the second case. This rule

prevents the mistae of defining it in two different

ways accidentally? the "main" -non%reference

mention is the only one that counts as a feature

definition and thus as a part acceptance criterion.

See also +asic dimensions, which are similar in somerespects.

)#=/ or )#=E/

re>uired

For example, " )#=/" written next to a fastener

means that four of those fasteners are re>uired for

the assem+ly.

)#B revision #ngineering drawings and material or

process specifications are often revised? the

usual revision control convention is to la+el the

versions A, @, C, /, etc.? a revision +loc -rev +loc

is a ta+ular area on the drawing -typically in the

upper right corner that lists the revision letters, a

+rief description of the changes and reasons, and

https://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scalehttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scalehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#cite_note-orau-2https://en.wikipedia.org/wiki/Reference_dimensionhttps://en.wikipedia.org/wiki/Reference_dimensionhttps://en.wikipedia.org/wiki/Reference_dimensionhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#BASIChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#BASIChttps://en.wikipedia.org/wiki/Specificationhttps://en.wikipedia.org/wiki/Revision_controlhttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scalehttps://en.wikipedia.org/wiki/Rockwell_scale#Scales_and_valueshttps://en.wikipedia.org/wiki/Rockwell_scalehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#cite_note-orau-2https://en.wikipedia.org/wiki/Reference_dimensionhttps://en.wikipedia.org/wiki/Reference_dimensionhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#BASIChttps://en.wikipedia.org/wiki/Specificationhttps://en.wikipedia.org/wiki/Revision_control


26/36

approval initials and dates. )evisions +eyond "6"

start the alpha+et over again with dou+ling, e.g., AA,

A@, AC, A/, and so on. In the days of manual

drafting, redrawing was expensive, so engineeringorders -#4s, #C4s, /Cs, #Cs were not always

incorporated into a next%letter revision. They thus

accompany the drawing as part of the T/8. ith the

dissemination of software usage -CA/, CA(,

8/(Ss, revision control is often +etter handled

nowadays, in competent hands at least. In recent

years the revision control of engineering drawings

has even +een standardi3ed +y AS(#, in their

standard '!.M2(.:2<

)FS

regardless of feature

si3e

A material condition -or more precisely, freedom from

such in G/KT. (eans that a given geometric

tolerance is true in relation to a certain datum

regardless of its actual si3e -&(C R actual si3e

R ((C.

)

right%hand

)eferring to handedness, such as the helix

handedness of screw threads or the mirror%image

handedness of a symmetrical pair of parts.

)) roughness height

readingSee surface roughness.

)(A return material

authori3ation See also )TB.

)(S root mean s>uare )(S in general is a statistical techni>ue to define a

representative value for a group of data points. ith

regard to surface roughness, it means that the

https://en.wikipedia.org/wiki/Revision_controlhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#cite_note-ASME_Y14.35M_1997-5https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#cite_note-ASME_Y14.35M_1997-5https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#GD.26Thttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#LMChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#LMChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MMChttps://en.wikipedia.org/wiki/Handednesshttps://en.wikipedia.org/wiki/Screw_thread#Handednesshttps://en.wikipedia.org/wiki/Screw_thread#Handednesshttps://en.wikipedia.org/wiki/Screw_thread#Handednesshttps://en.wikipedia.org/wiki/Screw_thread#Handednesshttps://en.wikipedia.org/wiki/Symmetryhttps://en.wikipedia.org/wiki/Symmetryhttps://en.wikipedia.org/wiki/Surface_roughnesshttps://en.wikipedia.org/wiki/Return_merchandise_authorizationhttps://en.wikipedia.org/wiki/Return_merchandise_authorizationhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#RTVhttps://en.wikipedia.org/wiki/Root_mean_squarehttps://en.wikipedia.org/wiki/Revision_controlhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#cite_note-ASME_Y14.35M_1997-5https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#GD.26Thttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#LMChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#MMChttps://en.wikipedia.org/wiki/Handednesshttps://en.wikipedia.org/wiki/Screw_thread#Handednesshttps://en.wikipedia.org/wiki/Screw_thread#Handednesshttps://en.wikipedia.org/wiki/Symmetryhttps://en.wikipedia.org/wiki/Surface_roughnesshttps://en.wikipedia.org/wiki/Return_merchandise_authorizationhttps://en.wikipedia.org/wiki/Return_merchandise_authorizationhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#RTVhttps://en.wikipedia.org/wiki/Root_mean_square


27/36

heights of the individual microscopic peas and

valleys shall +e averaged together via )(S to yield a

measurement of roughness. See also herein f as a

finish mar.

)T or )DT

rough turn, rough

turned? room

temperature

)ough%turned means turned on a lathe +ut not

finished to a final machined dimension and surface

roughness. Can apply to +ar stocor to parts in%

process. )oom temperature is sometimes

a++reviated ")T" within ta+les of specs for finishing

operations -plating, painting, etc..

)T8

release to production

The issuance of a drawing from the

engineeringDdesign activity to the production activity.

In other words, the event when a draft +ecomes a

completed, official document. A stamp on the drawing

saying "ISS*#/" documents that )T8 has occurred.

)TBroom%temperature

vulcani3ing? return to

vendor

!. )TB sealants, a way to seal $oints. ;. )eturn to

vendor, send parts +ac to a vendor for rewor orrefund +ecause they are nonconforming. Such )TB

often re>uires an )(A.

)6, )3 roughness, mean depth See surface roughness.

'

SA# Formerly the Society of

Automotive #ngineers?

now SA# International

And the many standards that it issues, for example,

the SA# A(S and SA# AS standards series.

SC or SDC sharp corners /imensions may +e given as "across sharp corners"

https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#f_meaning_finishhttps://en.wikipedia.org/wiki/Room_temperaturehttps://en.wikipedia.org/wiki/Room_temperaturehttps://en.wikipedia.org/wiki/Room_temperaturehttps://en.wikipedia.org/wiki/Surface_roughnesshttps://en.wikipedia.org/wiki/Surface_roughnesshttps://en.wikipedia.org/wiki/Surface_roughnesshttps://en.wikipedia.org/wiki/Bar_stockhttps://en.wikipedia.org/wiki/Room_temperaturehttps://en.wikipedia.org/wiki/Room_temperaturehttps://en.wikipedia.org/wiki/RTV_siliconehttps://en.wikipedia.org/wiki/RTV_siliconehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#RMAhttps://en.wikipedia.org/wiki/Surface_roughnesshttps://en.wikipedia.org/wiki/SAE_Internationalhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#f_meaning_finishhttps://en.wikipedia.org/wiki/Room_temperaturehttps://en.wikipedia.org/wiki/Room_temperaturehttps://en.wikipedia.org/wiki/Surface_roughnesshttps://en.wikipedia.org/wiki/Surface_roughnesshttps://en.wikipedia.org/wiki/Bar_stockhttps://en.wikipedia.org/wiki/Room_temperaturehttps://en.wikipedia.org/wiki/RTV_siliconehttps://en.wikipedia.org/wiki/RTV_siliconehttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#RMAhttps://en.wikipedia.org/wiki/Surface_roughnesshttps://en.wikipedia.org/wiki/SAE_International


28/36

although the corners get radiused. In other words,

distances may +e given from intersection points

where lines intersect, regardless of edge +reas or

fillets. This is usually implied +y default, so "SDC"often need not +e explicitly added. @ut in some

cases it clarifies the definition. See also TSC, 84I,

and AC.

SF or SDF spotface

SFAC# or

SDFAC# spotface

SCSsocet head cap screw

A cap screw with a socet head -usually implying a

hex socet, driven with a hex ey.

Sshown

See 8art num+er 5 Symmetrical parts for

explanation.

SSSsocet head set screw

A set screw with a socet head -usually implying a

hex socet, driven with a hex ey.

SI Systme international

:dEunits< :International

System of *nits<

The metric system in its current form -latest

standards.

S or SD serial num+er

S4& A solution anneal,

solution annealed

https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#TSChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#TSChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#POIhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#POIhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#AChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#AChttps://en.wikipedia.org/wiki/Spotfacehttps://en.wikipedia.org/wiki/Spotfacehttps://en.wikipedia.org/wiki/Hex_keyhttps://en.wikipedia.org/wiki/Hex_keyhttps://en.wikipedia.org/wiki/Part_number#Symmetrical_partshttps://en.wikipedia.org/wiki/Set_screwhttps://en.wikipedia.org/wiki/Set_screwhttps://en.wikipedia.org/wiki/Hex_keyhttps://en.wikipedia.org/wiki/Hex_keyhttps://en.wikipedia.org/wiki/International_System_of_Unitshttps://en.wikipedia.org/wiki/International_System_of_Unitshttps://en.wikipedia.org/wiki/International_System_of_Unitshttps://en.wikipedia.org/wiki/International_System_of_Unitshttps://en.wikipedia.org/wiki/Serial_numberhttps://en.wikipedia.org/wiki/Annealing_(metallurgy)https://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#TSChttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#POIhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#AChttps://en.wikipedia.org/wiki/Spotfacehttps://en.wikipedia.org/wiki/Spotfacehttps://en.wikipedia.org/wiki/Hex_keyhttps://en.wikipedia.org/wiki/Part_number#Symmetrical_partshttps://en.wikipedia.org/wiki/Set_screwhttps://en.wikipedia.org/wiki/Hex_keyhttps://en.wikipedia.org/wiki/International_System_of_Unitshttps://en.wikipedia.org/wiki/International_System_of_Unitshttps://en.wikipedia.org/wiki/Serial_numberhttps://en.wikipedia.org/wiki/Annealing_(metallurgy)


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S8#C or spec specification

S8#) A spheroidi3e anneal

S84TFAC# Spot facing

S) spherical radius )adius of a sphere or spherical segment.

SS or SDS

stainless steel?

supersede

!. Stainless steel, see also C)#S. ;.

SupersedeDsupersedesDsuperseded, refers to whenone document -specification, standard,drawing, etc.

replaces -supersedes another -see also revision

control.

SST

stainless steel

A somewhat unusual a++reviation? spell out for

clarity. "SS" or "C)#S" are more liely to +e

recogni3ed with certainty.

ST/ Standard

ST#8 'tandard for

theExchange

of $roduct (odel /ata

A standard format defined +y IS4 !MM for (@/

data generation, storage, and exchange.

STA solution treated and

aged

STI screw thread insert

https://en.wikipedia.org/wiki/Specification_(technical_standard)https://en.wikipedia.org/wiki/Annealing_(metallurgy)https://en.wikipedia.org/wiki/Spot_facinghttps://en.wikipedia.org/wiki/Stainless_steelhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#CREShttps://en.wikipedia.org/wiki/Specification_(technical_standard)https://en.wikipedia.org/wiki/Technical_standardhttps://en.wikipedia.org/wiki/Engineering_drawinghttps://en.wikipedia.org/wiki/Engineering_drawinghttps://en.wikipedia.org/wiki/Engineering_drawinghttps://en.wiktionary.org/wiki/supersede#Verbhttps://en.wikipedia.org/wiki/Revision_controlhttps://en.wikipedia.org/wiki/Revision_controlhttps://en.wikipedia.org/wiki/Stainless_steelhttps://en.wikipedia.org/wiki/ISO_10303https://en.wikipedia.org/wiki/Precipitation_hardeninghttps://en.wikipedia.org/wiki/Precipitation_hardeninghttps://en.wikipedia.org/wiki/Threaded_insert#Helical_inserthttps://en.wikipedia.org/wiki/Specification_(technical_standard)https://en.wikipedia.org/wiki/Annealing_(metallurgy)https://en.wikipedia.org/wiki/Spot_facinghttps://en.wikipedia.org/wiki/Stainless_steelhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#CREShttps://en.wikipedia.org/wiki/Specification_(technical_standard)https://en.wikipedia.org/wiki/Technical_standardhttps://en.wikipedia.org/wiki/Engineering_drawinghttps://en.wiktionary.org/wiki/supersede#Verbhttps://en.wikipedia.org/wiki/Revision_controlhttps://en.wikipedia.org/wiki/Revision_controlhttps://en.wikipedia.org/wiki/Stainless_steelhttps://en.wikipedia.org/wiki/ISO_10303https://en.wikipedia.org/wiki/Precipitation_hardeninghttps://en.wikipedia.org/wiki/Precipitation_hardeninghttps://en.wikipedia.org/wiki/Threaded_insert#Helical_insert


30/36

ST& steel

STLstoc

A nominal dimension for the stoc material, such

as +ar stoc

(

TA8Tapped hole

*sually implies drilling a hole if the hole does not

already exist.

T@ or TD@ title +loc An area of the drawing, almost always at the +ottom

right, that contains the title of the drawing and other

ey information. Typical fields in the title +loc

include the drawing title -usually the part name?

drawing num+er -usually the part num+er? names

andDor I/ num+ers relating to who designed andDor

manufactures the part -which involves some

complication +ecause design and manufacturing

entities for a given part num+er often change over

the years due to mergers and ac>uisitions, contract

letting, privati3ation, and the +uying and selling of

intellectual propertyNsee C/A and 4/A? company

name -see previous comment? initialsDsignatures of

the original draftsman -as wells as the original

checer and tracer in the days of manual drafting?

initialsDsignatures of approving managers

-issuanceDrelease%to%production information? cross%

references to other documents? default tolerancing

values for dimensions, geometry, and surface

roughness? raw%material info -if not given in a

separate listD+ill of materials? and access

control information -information a+out who is

authori3ed to possess, view, or share copies of the

information encoded +y the drawing,

https://en.wikipedia.org/wiki/Steelhttps://en.wikipedia.org/wiki/Bar_stockhttps://en.wikipedia.org/wiki/Tap_and_diehttps://en.wikipedia.org/wiki/Drillinghttps://en.wikipedia.org/wiki/Drillinghttps://en.wikipedia.org/wiki/Mergers_and_acquisitionshttps://en.wikipedia.org/wiki/Privatizationhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#CDAhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#CDAhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#ODAhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#RTPhttps://en.wikipedia.org/wiki/Access_controlhttps://en.wikipedia.org/wiki/Access_controlhttps://en.wikipedia.org/wiki/Access_controlhttps://en.wikipedia.org/wiki/Steelhttps://en.wikipedia.org/wiki/Bar_stockhttps://en.wikipedia.org/wiki/Tap_and_diehttps://en.wikipedia.org/wiki/Drillinghttps://en.wikipedia.org/wiki/Mergers_and_acquisitionshttps://en.wikipedia.org/wiki/Privatizationhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#CDAhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#ODAhttps://en.wikipedia.org/wiki/Engineering_drawing_abbreviations_and_symbols#RTPhttps://en.wikipedia.org/wiki/Access_controlhttps://en.wikipedia.org/wiki/Access_control


31/36

e.g., classificationnotices, copyright

notices, patent num+ers. /rawing

revision -versioning information is not always

included in the title +loc +ecause it often appears ina separate revisions +loc.

T/8

technical data pacage

The complete pacage of information that defines a

part, of which the drawing itself is often only a

su+set. It also includes engineering orders -drawing

change notices, M/ model datasets, data ta+les,

memoranda, and any special conditions called out +y

the purchase order or the companiesE terms%and%

conditions documents.

T/ or thd thread

TL or th thicness

T)*

Through

4ptionally applied to a hole dimension to signify that

the hole extends through the worpiece. For

example, T)* may +e stated in a hole dimension if

the holeEs end condition is not clear from graphical

representation of the worpiece.:<

T)* A&&

Through all

Similar to T)*. Sometimes used on hole

dimensions for clarity to denote that the hole extends

through multiple open space features as it goes

through the whole worpiece.:7<

Ti titanium

https://en.wikipedia.org/wiki/Classified_informationhttps://en.wikipedia.org/wiki/Classified_informationhttps://en.wikipedia.org/wiki/P

abbreviation or symbol - detailed drawing

Documents