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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
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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
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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
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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, @
scaleSee )ocwell scale.
)C hardness, )ocwell, C
scaleSee )ocwell scale.
)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
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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
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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
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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
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:*.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
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"
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
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-*#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¬es 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:
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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
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$
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
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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
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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
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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
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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
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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
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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
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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