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International System of Units

International Units SI and their Usage Excerpts from JIS Z 8203

2. Normative Reference

1. Scope of application

3. SI Units

3.1 Base Units

This standard specifies how to use the International System of Units (SI) and other international unitary systems, as

well as units used in correlation with units from international systems, and other units which may be used.

The following standards have been prescribed by SI. They adhere to the latest revisions of International System of

Units.

IEC 27-1:1971 Letter symbols to be used in electrical technologyーPart1:General

The name The International System of Units and its official abbreviation SI were adopted at the 11th General

Conference on Weights and Measures (CGPM) in 1960"

This system of measurements consists of the following units, it is a system of consistency.

ー Base Units

ー Derived UnitsThe International System of Units is based on the 7 base units indicated in table 1.

Table 1. Base Units

Base Quantity

Length

Mass

Time

Current

Thermodynamic Temperature

Amount of SubstanceLuminous Intensity

Meter

Kilogram

Second

Ampere

Kelvin

MoleCandela

Base Units

Unit Symbol

Table 3. Names of units recognized to protect people's health

Base Quantity

Base Quantity

Derived Units

Derived Units

Unit SymbolExpression in terms of Base Unit,Supplementary Unit or other SI Units

Unit SymbolExpression in terms of Base Unit,Supplementary Unit or other SI Units

Radioactivity

Pull-in Doses

Radio Equivalent

Becquerel

Gray

Sievert

Table 2. SI Derived Units with Special Names and Symbols

Electrostatic Capacity, Capacitance

Electric Resistance

Conductance

Magnetic Flux

Radian

Steradian

Hertz

Newton

Pascal

Joule

Celsius Degree is used for indicating Celsius temperature which is the subst itute unit for Kelvin（K）.

Yotta

Zetta

Exa

Peta

Tera

Giga

Mega

Kilo

Hect

Deca

Deci

Centi

Milli

Micro

Nano

Pico

Femt

AttoZepto

Yocto

Plane Angle

Solid Angle

Frequency

Force

Pressure, Stress

Energy, Work, HeatWork Rate, Process Rate,Power, Electric Power

Electric Charge, Quantity of Electricity

Potential, Potential Difference, Voltage,Electromotive Force Inductance

HenryCelsius Degree or Degree＊

Lumen

Lux

Watt

Inductance

Celsius Temperature

Light Flux

Illumination

Magnetic Flux Density,Magnetic Induction

Coulomb

Bolts

Farad

Ohm

Siemens

Weber

Telsa

Table 4. Prefixes

Multiplesof Unit

Prefixes

Name Symbol

78



4. SI unit increases by integer powers of 10

The multiples, names, and symbols of prefixes to express integer multiples of 10 in SI units are shown in Table 4.

SI prefixes are attached directly to SI base units. Through this method, integers in multiples of ten are able to be constructed and a new

symbol is used to represent the unit. The symbols for SI prefixes can be attached directly to other symbols for SI units, but they are not

combined with complex symbols that already employ SI prefixes. For example, a nanometer is represented with the symbol nm, but the

symbol ｍμｍ would be incorrect.

Conversion Tables for SI and Conventional Units（The units enclosed in bold lines are SI units）

Force Viscosity

StressKinematicViscosity

Pressure

Energy,Work,Quantityof Heat

French Horse Power

Energy,Work,Quantityof Heat

ThermalConductivity

Coefficient ofHeat Transfer

Specific Heat

or or

or

179



Unit Symbols and Finding the Volume

Greek Letters

NameAlphaBetaGammaDeltaEpsilonZetaEtaThetaIotaKappaLambdaMu

NuXiOmicronPi

RhoSigmaTauUpsilonFiChiPsiOmega

Angle, coefficientAngle, coefficientAngle, weight of unit volume, (if uppercase) gamma functionSmall variation, density, displacementSmall positive quantity, strain coefficientVariableVariableAngle, temperature, time

Turning radiusWavelength, fixed valueCoefficient of friction, 10-6 (micro)

FrequencyVariable

Ratio of a circle's circumference to its diameter (3.14159…),angle, (uppercase) symbol for productRadius, densityStress, standard deviation, (uppercase) summationTime constant, time, torque

Angle, function

Angle, functionAngular velocity=2πf, (uppercase) unit symbol for ohm

Normal

Uppercase Lowercase Uppercase Lowercase Typical applications

Italics

Volume of Solids and Numeric Values

Indicates lowercase unless specified as uppercase.

Dimensions

（Hexagonal cone）

（Hexagonal cone）

Volume and numeric values Dimensions Volume and numeric values VolumeSurface areaLateral areaBase areaDistancefrom thebase surfaceto center

of gravity

80



Second Moment of Area, SectionModulus, and Turning Radius of Cross Section

Shapeof cross section

Cross section area Second momentof area

Where g = brim slope

Section modulus Turning radiusDistance fromneutral axis

to farthest section

181



Formulas for GD

2

（The symbol γ in the drawings is the specific weight.）

W（Weight）GD2Shape of object

GD2

82



Shape of object W（Weight）GD2

Parallel axis theorem for an object in GD2

Axis O

Axis i

Axis i

Axis i

relative to the axis O whichpasses the center of gravity of the object

relative to the axis i parallelto the axis O and η apart from the axis O

Weight of objectDistance between the axes O and i

Addition theorem for an object in GD2

relative to the axis i of any object j

Number of objectsNote) If the axis i does not pass the center of

gravity of the object, GD2 relative tothe axis i for each object should becalculated and added.

Subtraction theorem for an object in GD2

relative to the axis i where there isno space

relative to the axis i ofan virtual object having the same specificweight where this object fills any space

Basic relationship between GD2 ,torque and number of revolutions of an axis Number of revolutions of an axis

Initial number of revolutions of an axisTimeTorque （Acceleration: +, deceleration: -）

Kinetic energy of a revolving object

Number of revolutions of an axis

183



Tolerance of form, orientation, location and run-outExcerpts from JIS B 0021: 1998

Symbol

Parallelism tolerance1. Parallelism tolerance of a line relative to a datum line

2. Parallelism tolerance of a line relative to a datum surface

Perpendicularity tolerance

Angularity tolerance

1. Perpendicularity tolerance of a line relative to a datum line

2. Perpendicularity tolerance of a line relative to a datum surface

1. Angularity tolerance of a line relative to a datum surface

2. Angularity tolerance of a surface relative to a datum surface

Datum A

Datum A

Datum A

Datum A

Datum B

Datum B

Definition of the tolerance zone Indication and explanation

Geometrical tolerancing

The tolerance zone islimited by two parallelplanes separated bydistance t.The planes are parallel tothe datum and in thedirection specified.

The tolerance zone islimited by a cylinder ofdiameter t parallel to thedatum if the tolerancevalue is preceded by thesign φ.

The tolerance zone islimited by two parallelplanes separated bydistance t and parallel tothe datum plane B.

The tolerance zone islimited by two parallelplanes separated bydistance t andperpendicular to thedatum.

The tolerance zone islimited by a cylinder ofdiameter t perpendicularto the datum if thetolerance value ispreceded by the sign φ.

The tolerance zone islimited by two parallelplanes separated bydistance t and inclined atthe specified angle to thedatum.

The tolerance zone islimited by two parallelplanes separated bydistance t and inclined atthe specified angle to thedatum.

The actual (extracted)axis shall be containedbetween two parallelplanes 0.1 apart whichare parallel to the datumstraight line A and in thedirection specified.

The actual (extracted)axis shall be a cylindricalzone of diameter 0.03parallel to the datumstraight line A.

The actual (extracted)axis shall be containedbetween two parallelplanes 0.01 apart whichare parallel to the datumplane B.

The actual (extracted)axis shall be containedbetween two parallelplanes 0.06 apart, whichare perpendicular to thedatum line A (datum axis).

The actual (extracted)axis of the cylinder shallbe a cylindrical zone ofdiameter 0.1perpendicular to thedatum plane A.

The actual (extracted) axisshall be contained betweentwo parallel planes 0.08apart which areperpendicular to the datumplanes A and B, orthogonalto each other, and inclinedat a theoretically exact 60°angle to the datum plane A.

The actual (extracted)surface shall be containedbetween two parallelplanes 0.08 apart whichare inclined at atheoretically 40° angle tothe datum plane A.

86



Symbol

Position tolerance

Concentricity and coaxiality tolerance

Symmetry tolerance of a median plane

Circular run-out tolerance

Total run-out tolerance: Total radical run-out tolerance

1. Circular run-out tolerance - radial

2. Circular run-out tolerance - axial

1. Position tolerance of a line

Datum A

Datum point ACross-section

Tolerancedfeature Cross-section

Tolerance zone

Datum C

Datum B

Definition of the tolerance zone Indication and explanation

The tolerance zone islimited by a cylinder ofdiameter t if the tolerancevalue is preceded by thesign φ. The axis is fixedby theoretically exactdimensions with respect tothe datums C, A and B.

The tolerance zone islimited by a circle ofdiameter t if the tolerance

value is preceded by thesign φ. The center of thecircular tolerance zonecoincides with the datumpoint A.

The tolerance zone islimited by a cylinder ofdiameter t if the tolerancevalue is preceded by thesign φ. The center of thecylindrical tolerance zonecoincides with the datumpoint A.

The tolerance zone islimited by two parallelplanes separated bydistance t, symmetricallydisposed about the medianplane with respect to thedatum.

The tolerance zone islimited within any crosssection perpendicular tothe datum axis by twoconcentric circles with adifference of t in radii, the

centers of which coincidewith the datum axis.

The tolerance zone islimited to any radialposition by two circlesseparated by distance tlying in a cylindricalsection, the axis of whichcoincides with the datum.

The tolerance zone islimited by two coaxial

cylinders separated bydistance t, the axes ofwhich coincide with thedatum.

The actual (extracted) axisshall be within a cylindricalzone of diameter 0.08 theaxis of which coincideswith the theoretically exactposition of the axis of thehole, with respect to thedatum planes C, A and B.

The actual (extracted)center of the outer circleshall be within a circle of

diameter 0.1 concentricwith datum circle A.

The actual (extracted) axisof the large cylinder shallbe within a cylindrical zoneof diameter 0.08 the axis ofwhich is the commondatum straight line A-B(common datum axis).

The actual (extracted)median surface shall becontained between twoparallel planes 0.08 apartwhich are symmetricallydisposed about the datummedian plane A.

The actual (extracted)radial run-out shall not begreater than 0.1 in anycross section during onerevolution about thecommon datum straight

line A-B (common datumaxis).

The actual (extracted) line,in any cylinder axis whichcoincides with the datumstraight line D, shall becontained between twocircles with a distance of0.1.

The actual (extracted)surface shall be contained

between two coaxialcylinders with a differencein radii of 0.1 and the axescoincident with thecommon datum axisstraight line A-B.

187



System of Limits and Fits Excerpts from JIS B 0401:1998

Table of Common Hole Basic FitsBasichole

Shaft tolerance classes

Clearance fit

Clearancefit

Clearancefit

Clearancefit

Clearancefit

Clearance

fit

Transition fit

Transitionfit

Transitionfit

Interference fit

Interferencefit

Interference

fit

There may be exceptions in these fits depending on dimension classes.

Interrelation of Tolerance Classes for Hole Basis Fits often Used

Basic shaft

Fits

Shaft tolerance class

Dimension line

The above figure indicates the case where the basic dimension is 30mm.

88



Table of Common Shaft Basic FitsBasicshaft

Hole tolerance class

Clearance fit Transition fit Interference fit

There may be exceptions in these fits depending on dimension classes.

Interrelation of Tolerance Classes for Shaft Basis Fits often Used

Basic shaft

Fits

Shaft toleranceclass

Dimension line

The above figure indicates the case where the basic dimension is 30mm.

Clearance fit

Clearance fit Clearancefit

Clearance fit Clearance fit

Transition fit

Transition fit

In

terference fit

Interference fit

189



Deviations of Holes to be Used in Commonly Used Fits

BasicDimensions

Tolerance Zone Class

>3

>6

>10

>14

>18

>24

>30

>40

>50

>65

>80

>100

>120

>140

>160

>180

>200

>225

>250

>280

>315

>355

>400

>450

The top numbers in this chart represent the upper dimensional allowance values and the bottom numbers represent the lower dimensional allowance values.Notes

≦3

≦6

≦10

≦14

≦18

≦24

≦30

≦40

≦50

≦65

≦80

≦100

≦120

≦140

≦160

≦180

≦200

≦225

≦250

≦280

≦315

≦355

≦400

≦450

≦500

90



BasicDimensions


>3

>6

>10

>14

>18

>24

>30

>40

>50

>65

>80

>100

>120

>140

>160

>180

>200

>225

>250

>280

>315

>355

>400

>450

≦3

≦6

≦10

≦14

≦18

≦24

≦30

≦40

≦50

≦65

≦80

≦100

≦120

≦140

≦160

≦180

≦200

≦225

≦250

≦280

≦315

≦355

≦400

≦450

≦500

Excerpt from JIS B 0401-1998

191



Deviations of Holes to be Used in Commonly Used Fits

BasicDimensions


>3

>6

>10

>14

>18

>24

>30

>40

>50

>65

>80

>100

>120

>140

>160

>180

>200

>225

>250

>280

>315

>355

>400

>450

≦3

≦6

≦10

≦14

≦18

≦24

≦30

≦40

≦50

≦65

≦80

≦100

≦120

≦140

≦160

≦180

≦200

≦225

≦250

≦280

≦315

≦355

≦400

≦450

≦500

The top numbers in this chart represent the upper dimensional allowance values and the bottom numbers represent the lower dimensional allowance values.Notes

92



BasicDimensions


>3

>6

>10

>14

>18

>24

>30

>40

>50

>65

>80

>100

>120

>140

>160

>180

>200

>225

>250

>280

>315

>355

>400

>450

≦3

≦6

≦10

≦14

≦18

≦24

≦30

≦40

≦50

≦65

≦80

≦100

≦120

≦140

≦160

≦180

≦200

≦225

≦250

≦280

≦315

≦355

≦400

≦450

≦500


193



Excerpts from JIS B 0405: 1991/ JIS B 0419: 1991

Tolerances for Length Not Including Chamfered Section

Tolerance

class

Tolerance

class

Tolerance

class

Basic length divisions

Basic length divisions

Symbol

Tolerance class

Symbol Descriptions

Fine class

Medium class

Coarse class

Extremelycoarse class

Tolerance class

Descriptions

Fine class

Medium class

Coarse class


Symbol

Tolerance class

Descriptions

Fine class

Medium class

Coarse class


From 0.5to 3

From 0.5to 3

From 3 to 6

From 3to 6

From 6 to 30From 30to 120

From 120to 400

From 400to 1000

From 1000to 2000

From 2000to 4000

Tolerance

ToleranceTolerance

For basic lengths less than 0.5mm, the tolerance is specified individually.

For basic lengths less than 0.5mm, the tolerance is specified individually.

Tolerance for Iengths ofChamfered Section(Length of Corner Roundness and CornerChamfering) Angular Tolerance

Morethan 6

Length（mm）divisions of short side of target angle

10 or less

10 or less

From 10to 50

From 50to 120

From 120to 400

Morethan 400

General Tolerance of Perpendicularity

Nominal length divisions of short side

100 or less

From 100

to 300

From 300

to 1000

From 1000

to 3000

From 100

to 300

From 300

to 1000

From 1000

to 3000

Perpendicularity tolerance

General Toleranceof Circular Run-out

Circular

run-outtolerance

General Tolerance of Straightness and Flatness

Straightness tolerance and flatness tolerance

Nominal length divisions

From 10

to 30

From 30

to 100

General Tolerance

94



ISO General Purpose Metric Screw ThreadsExcerpts fromJIS B0205 -1:2001

ISO General Purpose Metric Screw Threads - Part 1: Basic Profile

Basic minor diameter of internal thread（nominal diameter）Basic major diameter of external thread（nominal diameter）Basic pitch diameter of internal threadBasic pitch diameter of external threadBasic minor diameter of internal threadBasic minor diameter of external threadFundamental triangle height

Pitch

Axis ofscrew thread

Pitch

195



Excerpt fromJIS B0205-4:2001ISO General Purpose Metric Screw Thread

ISO General Purpose Metric Screw Thread - Part 4: Basic Dimensions

Nominal ofThread Outside

Diameter

Pitch InsideDiameter

PitchDiameter

Nominal ofThread Outside

Diameter

Pitch InsideDiameter

PitchDiameter

Reference Outer Diameter d of Male Thread is equal to Minor Diameter D ofFemale Thread.Inside Diameter D1 of Female Thread is equal to Minor Diameterd1 of Male Thread.

96



Unified Coarse Screw Thread/Unified Fine Screw Thread

Basic Profiles, Formulas and Dimensions

Excerpt from JIS B 0206-1973/JIS B 0208-1973

FemaleThread

Male Threadn=number of thread peaks in 25.4mm

Unified Coarse Screw Thread

Unified Fine Screw Thread

Nominal of Thread*

（Ref）（Ref）

Number ofThread

Peaks in25.4 mm

Pitch Height ofEngagement

Female Thread

MinorDiameter

D

PitchDiameter

D2

InsideDiameter

D1

OuterDiameter

d

PitchDiameter

d2

MinorDiameter

d1

Male Thread

Priority should be given to Column 1. If required, refer to the items in Column 2 and 3, in that order.

Priority should be given to Column 1. If required, refer to the items in Column 2 and 3, in that order.

or

or

or

197



Parallel Pipe Threads

Basic Profiles, Formulas and Dimensions


FemaleThread

Male Thread

Axis of Thread

Nominal ofThread

Number ofThread Peaks

in 25.4 mmPitch Thread Height

（Ref）

RadiusFemale Thread

Male Thread

OuterDiameter

d

MinorDiameter

D

PitchDiameter

d2

PitchDiameter

D2

MinorDiameter

d1

InsideDiameter

D1

or

or

or

98



Size of CarbonSteel Pipesfor Ordinary

Piping（Ref.）

Outside

Diam

eter

Thick

ness

Taper Pipe Threads Excerpt from JIS B 0202-1999

Basic Profile for Taper Pipe Threads and Basic DimensionsBasic Profile for Taper Male Thread and Taper Female Thread

Axis of Thread

The thick line showsthe basic profile.

Basic Profile for Parallel Female Thread

Axis of Thread

The thick line showsthe basic profile.

Fit between taper male thread and taper female thread orparallel female thread

Parallel Female Thread

Taper Female Thread

Taper Female Thread

Position ofGauge Plane

Taper Male Thread

Designation of Thread

Thread

Number of threads

（per 25.4mm）

Pitch

（Reference）

Thread Height

Radius

or

Gauge Diameter

Male Thread Male Thread

Major

Diameter

Pitch

Diameter

Minor

Diame

ter

Female Thread

FemaleThread

Major

Diameter

Pitch

Diameter

Mino

r

Diame

ter

Position of Gauge Plane

From Pipe End

G

auge Length

Axial Tolerance

At PipeEnd

Axial Tolerance

Tolerance on D, D2 and D1

Dime

nsions of Parallel Female Thread

Length of Use ful Thread（Min.）

MaleThread Female Thread

From Position of Gauge Plane

Toward the Larger Diameter

When there is anIncomplete Thread

Whenthere is noIncomplete

Thread

TaperFemaleThread

ParallelFemaleThread

Taper FemaleThread,

Parallel FemaleThread

From Po

sition

of Gauge Plane

Toward

the

Smaller D

iameter

From E

nd of

Pipe

or

Coupler

This designation is for taper male threads. For taper female threads and parallel female threads, dimension R shall be substituted by Rc and Rp, respectively.

Taper thread length is from the gauge plane position toward the small diameter side. Parallel thread length is from the end of of the pipe.

199



Excerpt from JIS B 1176-2000Hexagon Socket Head Cap Screw

Basic Profiles and Dimensions

The inside Chamfering may beworked on hexagonal socket.

Shall be chamfered end.However, as-rolled end isacceptable for M4 or less.

Min.

Min.

CircularCone Bottom

IncompleteThread

Nominal of Thread

Pitch of ScrewThread

（for reference）

Max.

Max.

Min.

Max.

Max.

Min.

Min.

Max.

Min.

Min.

Nominal

Max.

Min.

Min.

Max.

Min.

Min.

Drill Bottom（2P or less）

Applied to the length under dotted line.

Without knurling applied to the screw head.

With knurling applied to the screw head.

00



Nominal of Thread

and

Length

The recommended nominal lengths (L) for the nominal of screws threads shall be within the frame of bold lines. The cap crews shorter than the position of dottedline in nominal length(L) shall be whole threads and the length of the incomplete thread at the underhead part shall be approx. 3P. TheRg max. andRs min. forthe cap screw, or which the nominal length(L) is longer than the position of dotted line, shall be in accordance with the following formula.

201



Hexagon Socket Setscrew

Basic Profiles and Dimensions

Excerpt from JIS B 117７-1997

The inlet of the hexagon socketmay be rounded or chamfered.

or Approx.45°

Approx.120°

CircularCone Bottom

Nominal of Thread

Pitch

Incomplete Thread

Core Diameter of Male Thread

（Reference）Approx. Mass per 1000 units / unit: kg（Density: 7.85kg/dm3）

Drill Bottom

（2P or less）

Max.

Min.

Min.

Min. Max.NominalLength

Min.

Nominal

Max.

Min.

Should be chamfered to 120 degrees if below the double line, which forms stars, in the table.45 degree slanted portion below the trough diameter line of the male scew.

e min = 1.14x s min. Excluding nominal M1.6, M2, M2.5 for screws.Applied to the nominal lengths（L）falling below the double l ine.Applied to the nominal lengths（L）above the double line.

Notes 1. Nominal lengths（L）for individual screw sizes are enclosed by thick lines.2. Dimensions are based on JIS B 0143.3. The bottom of the hexagon socket may be conical, drill or roundshape. However, for either shape, the drilled hole may never be greater that 1.2 times dimension t.

Ref. The basic profile and dimensions indicated in the table are based on ISO 4026-1993.

02



Hexagon Bolt

Basic Profiles and Dimensions - Parts Grade A


To be chamfered. M4or smaller screw maybe unpointed.

The shaded areaindicates the range ofthe max. and min.throat of a fillet weld.

Incomplete Thread（2P or less）

dw Min. dimensionshould be verified here.

Enlarged figure of section X

Nominalof

Thread

Coarse ScrewThreadCourse ThreadPitchFine ScrewThread

Min.Max.Max.

Standard Size=Max

Min.Min.

Min.Max.

Standard Size=Nominal

Min.Max.Min.Min.

Standard Size=Max

Min.

（Ref.）

Bolt Size （L）NominalLength Min.

Min.Max. Max. Max. Max. Max. Max. Max. Max. Max. Max. Max. Max.Min. Min. Min. Min. Min. Min. Min. Min. Min. Min. Min.Max.

and

1.The nominal of thread prioritizes the values in column Ⅰ. Expression of nominal of thread based on JIS B 0123.2.Recommended nominal lengths are enclosed between the two lines.3.The difference between dimension b and thread lengths longer than the specifications contained within the bold lines can be accomplished if customers request.

However, we recommend adherence to JIS B 1021 standards.4.Rg Max. and Rs Min. is as follows. Rg Max = Nominal Length L-b, Rs Min =Rg Max - 5P（P=Course Thread Pitch）5.Values in this table for da and r are based on JIS B 1005.6.Chamfering and as-rolled ends of the screws are performed in accordance to JIS B 1003.

Notes

203



Hexagon Nut / Hexagon Thin Nut Excerpt from JIS B 1181-2004

Hexagon Nut -Styles 1 and 2

（Parts Grade A and B）

Hexagon Nut C（Parts Grade C）

Notes NotesInclusion of washers determined by customer

TypeChamferingBoth Sides

WithoutChamfering toBoth Sides

Hexagon Nut

Hexagon Nut CStyle 1

ChamferingBoth Sides

Chamfering Both Sides

Inclusion of washers determined by customer

based oncustomer's request

Metric Course Screw Thread and Fine Screw Thread

Hardness（Min.）


based oncustomer's request based on

customer's request







Based on JISB 1057

Based on JISB 1057

Based on JISB 1057

Washersincluded

Parts Class

Screw

Steel

Coarse Screw

Thread

Fine Screw

Thread

Coarse Screw

Thread

Fine Screw

Thread

Stainless Steel

NonferrousMetal

Type

ToleranceClass

Mechanical Properties（Strength Classification）

Style 2

Hexagon Thin Nut

Chamfering of threads optional

Style classifications indicate hexagon nut height differences.Style 2 is taller than Style 1. Nominal height is 0.8d or higher. Nominal height is 0.8d or higher.

04



Hexagon Thin NutChamfering Both Sides（Parts Grade A and B）

Hexagon Thin NutWithout Chamfering to Both Sides

（Parts Grade B）

Hexagon Thin Nut Hexagon Thin Nut

Nominalof

Thread

Hexagon Nut Hexagon Nut

Style 1（Parts Grade A）（Parts Grade B）

Style 2（Parts Grade A）（Parts Grade B）


（Parts Grade A）（Parts Grade B）


WithoutChamferingto Both Sides

（Parts Grade B）

StandardSize

StandardSize

Styles 1 & 2Hexagon Thin Nut


（Parts GradeA and B）


WithoutChamferingto Both Sides

（Parts Grade B）

Max. Min. Max. Min. Max. Min. Max. Max.Min. Min. Min. Min. Min.

Nominal threads contained within parentheses are secondary options. They should not be used when possible.

Notes

205



Excerpts from JIS B 1256:1998Plain Washers

Small and Normal Series - Part Grate A and Chamfered Normal Series

- Forms and Dimensions of Part Grade ASmall and Normal Series- Forms of Part Grade A Chamfered Normal Series- Forms of Part Grade A

Deburring Deburring

Nominaldia.

Inside dia.Parts - Dimensions of Part Grade A Normal and chamfered normal series- Dimensions of Part Grade A

Outside dia Outside diaThickness h Thickness hBasic

dimensions（Min）

Basicdimensions（Max）

Basicdimensions（Max）

Max Min Max MaxMin MinMin

1 The nominal diameter here is the same as the nominal thread of the screws assembled with the washer.2 Chamfered normal series- Specified by nominal diameter 5 of a screw thread to which part grade A applies

Material classes Steel

Small, Normal and Chamfered Normal Series - Specifications of Part Grade A

Austenitic stainless steel

Mechanicalproperties

Hardness classes

Hardness HV 140 or moreTolerance Compliant with part grade A specified by JIS B 1022.

Surface conditionGenerally, no surface treatment is carried out. If plating and other surface treatments are required,the customer should specify so.If electroplating is used, it should be compliant with JIS B 1044.

Basicdimensions

Basicdimensions

207



Plain Washers Excerpts from JIS B 1256:1998

Normal and Extra Large Series - Forms and Dimensions of Part Grade CNormal and extra large series - Forms of part grade C

Normal series - Dimensions of part grade C

Nominal diaInside dia Outside dia Thickness

Basic dimensions（Min） Max MaxBasic dimensions （Max） Min MinBasic dimensions

The nominal diameter here is the same as that of a thread to be assembled with the washer.


Extra large series - Dimensions of part grade C

Nominal diaInside dia Outside dia Thickness

Basic dimensions（Min） Max MaxBasic dimensions （Max） Min MinBasic dimensions

Normal and extra large series - Specifications of part grade C

Material classes Steel


Hardness classes

Hardness HV 100 or more100HV

Tolerance Compliant with part grade C specified by JIS B 1022.


08



Excerpts from JIS B 1256:1998Plain Washers

Large Series - Forms and Dimensions of Part Grade A or CLarge series - Forms and dimensions of part grade A or C

Part grade ADeburring

Nominaldia

Inside dia Outside dia ThicknessBasic dimensions（Min） Max MaxBasic dimensions （Max） Min MinBasic dimensions

Part grade Part grade Part grade Part grade Part grade Part grade Part grade


Large series - Specifications of part grade A or C

Material classes Steel Austenitic stainless steel


Hardnessclasses

Hardness HV

Part grade APart grade C

Part grade APart grade C

140 or more140 or more

A140

100 or more

Compliant with part grades A and Cspecified by JIS B 1022.Nominal diameter is 16 mm or less : Part grade ANominal diameter is more than 16 mm : Part grade C

Tolerance Compliant with part grade Aspecified by JIS B 1022.


or or

209



Diameter of Clearance Hole andCounterbore for Bolt and Screw Excerpt from JIS B 1001-1985

Dimensions

Nominalof Thread

Clearance Hole

Class 1 Class 2 Class 3 Class 4Chamfer e Counterbore D'

Class 4 is primarily suited for cast holes.

In the dimension of Clearance Hole and Counterbore for Bolt and Screw in this table, the dimensions in brackets are not providedin ISO 273.Chamfering is performed based on necessity. The angle is, in principle, 90 degrees.If a counterbore that is larger or smaller than those listed in this table is necessary for a nominal thread, choose a counterbore sizethat fits the series established in the table as close as possible.

The face of the counterbore should be a right angle to the center line of the hole, and the depth of the counterbore is generally theextent coming off the mill scale.

Notes

10



Dimensions of Hole forHexagon Socket Head Cap Screw

Dimensions of Clearance Hole and Counterbore

Nominal ofThread

211



Keys and Their Corresponding Keyways

Tolerance

Tolerance

Tolerance

Tolerance

Tolerance

Shape and Dimensions of Parallel Key and KeywayKey unit

Keywaycross-section

Nominal Dimension

of Key

b error

h error

Key dimensions

Basic

Dimensions

Basic

Dimensions

Tolerance

Tolerance

Keyway Dimensions

b1and b

2 basic

Dimensions

Sliding type Normal typeTighteningtype

b1andb2

r1 and r

2

Basic Dimension

of t1

Basic Dimension

of t2

Tolerance of

t1 and t

2

Reference

Applicable axis

Diameter d

12



Shape and Dimension of Taper Key, Gib-headed Taper Key and KeywayKey Taper Key（T） Gib-headed Taper Key（TG）

Slope Slope

Tolerance of b

Tolerance of h

Nominal Dimension

of Key

Key Dimension

Basic

Dimensions

Basic

Dimensions

Basic

Dimensions

Tolerance

Keyway Dimension

Tolerance

Tolerance

and

Basic

Dimension

of and

and

Tolerance of

Reference

Applicable

Shaft

Diameter

Basic

Dimension

of

Basic

Dimension

of

Excerpts from JIS B 1301: 1996

Keywaycross-section

213



Characteristics of Plastic Screws

Resin Material Abbreviation, Name and Heat Resistant Temperature

Abbreviation Name Heat Resistant Temperature

Polyetheretherketone

Polyphenylene Sulfide

Aurum

Tertrafluoroethylene

Hard Polyvinyl Chloride

50% Glass Fiber ReinforcedPolyamide MXD6

Polycarbonate

Polypropylene

Polyvinylidene Fluoride

180℃（UL Approved Temperature）




ー10℃∼35℃（Temperature Range）




ー40℃∼90℃（Temperature Range）

The values listed above are for reference only; the temperature ranges willvary according to tightening torque.

CautionPlastic Screws comply with JIS and ISO standards.

However, due to differences in manufacturing

processes, specifications may vary slightly from that of

metal screws.

Mechanical property values in charts are for reference

only. Values may vary with performance conditions.

Use a torque driver or torque wrench to tighten screws.

Chemical resistance values will vary according to usage

conditions. Plastic Screws should be tested under

actual performance conditions prior to use.

Colors of small screws, bolts, nuts, and washers may

vary slightly by production lot.

Plastic Screw Selection Index

Strength

Heat Resistance

Chemical Resistance

See chart for Tensile Breaking Force（N）

See chart above

See chart for Chemical Resistance

Physical Properties

Properties

Tensile Strength

Tensile Elongation

Flexural Strength

Flexural Modulus

Izot Impact, Notched

Rockwell Hardness

Deflection Temp under load（1.82MPa）

Flame Class

Dielectric Constant（106Hz）

Dielectric Loss Trangent（106Hz）

Volume Resistivity（X1016）

Dielectric Breakdown Strength

Arc Resistance

Specific Gravity

Water Absorption（24hX20℃）

Glass Fiber Content

Test Method Unit

The numerical values listed above are for reference only; they are not guaranteed under performance conditions.

R/M Scale

Properties

Properties

Tensile Strength

Tensile Elongation

Hardness100% Modulus

Low Temp. Resistance

Specific Gravity

Test Method（JIS） Unit

Test Rate: 200mm/min

Test Rate: 200mm/min

Test Rate: 200mm/min（2mm thick, 3 pieces）10 sec.

A-Method


PEEK is a registered trademark of Victrex, PLC.

AURUM is a registered trademark of VitreTM.

RENY is a registered trademark of Mitsubishi Engineering-Plastics Corporation.

/

/ /

16



Chemical Resistance

10% Hydrochloric Acid

10% Sulfuric Acid

50% Sulfuric Acid

10% Nitric Acid

50% Nitric Acid

10% Hydrofluoric Acid


10% Phosphoric Acid

Formic Acid

10% Acetic Acid

Citric Acid

Chromic AcidBoric Acid

Methyl Alcohol

Glycol

Ammonia

10% Sodium Hydroxide

10% Potassium Hydroxide

Calcium Hydroxide

Water

Hydrogen Sulfide（Gas）

Sulfur Dioxide

Ammonium Nitrate

Sodium NitrateCalcium Carbonate

Calcium Chloride

Magnesium Chloride

Magnesium Sulfate

Zinc Sulfate

Hydrogen Peroxide

Chemical Name

Usable

Usable under certain conditions

Unusable

Data from sample tested at room temperature（23℃）. Chemical resistance values will vary according to usage conditions.Plastic screws should be tested under actual performance conditions prior to use.

Plastic Screw Tensile Breaking Force（N）

The numerical values listed above are for reference only;they are not guaranteed under performance conditions.

Plastic Screw Tensional Breaking Torque（N/m）

The numerical values listed above are for reference only;they are not guaranteed under performance conditions.The recommended torque is 50% of the numerical values listed above.

217



Characteristics of Special Material Screws

Physical Properties

Specific Gravity

Longitudinal ElasticModulus

Transverse ElasticModulus

Electric Resistance

Specific Heat

Thermal Conductivity

Linear ExpansionCoefficient

Properties Titanium Hastelloy Inconel Nickel Molybdenum Phosphor Bronze Aluminum

Properties Titanium Hastelloy Inconel Nickel Molybdenum Phosphor Bronze Aluminum

Hastelloy Inconel Nickel Molybdenum Phosphor Bronze Aluminum



Room TemperatureRoom TemperatureRoom Temperature

Room TemperatureRoom Temperature

Room TemperatureRoom Temperature

Room Temperature

Mechanical Properties

Tensile Strength

0.2% Proof Stress

Elongation

Hardness

Greater than 8

Tensional Breaking Force of Special Material Screws


Values are for Titanium Socket Head Screws.

The numerical values listed above are for reference only;they are not guaranteed under performance conditions.

Values are for Titanium Socket Head Screws.

Tensional Breaking Torque ofSpecial Material Screws（N・m）

Magnetic Flux Density of Titanium Screws and Phosphor Bronze Screws

Magnetic Flux Density

SUSXM7（SUS304 Equivalent）

Measuring Device: FW Bell 5080 Gauss/Tesla Meter

Measuring Conditions: DC Magnetic Measuring Field

5mm distance between the probe and the sample

NBK delivers Titanium Screws and Phospor Bronze Screws,which are completely Nonmagnetic.(0 Magnetic Flux Density)

Stopfollowingme!

Ceramic TitaniumTitanium

Titanium

PhosphorBronze

18



The above is test data on test samples. Chemical resistance values willvary according to usage conditions. Screws should be tested underactual performance conditions prior to use.

Chemical Resistance of Titanium Screws Chemical Resistance of Hastelloy/Inconel/Nickel Screws

Chemical Resistance of Ceramic Screws

Chemical Name Time Ceramic

35% Hydrochloric Acid

70% Sulfuric Acid

98% Nitric Acid

90% Phosphoric Acid


10% Potassium Hydroxide

Potassium Hydroxide

Sodium Hydroxide

Sodium Carbonate

Sodium Sulfate

Boiling

Boiling

Boiling

Boiling

30 Minutes

30 Minutes

30 Minutes

30 Minutes

24 Hours

7 Days

24 Hours

24 Hours

24 Hours

24 Hours

（Boiling）

（Boiling）

（Boiling）

（Boiling）

Chemical Name Composition Titanium

Hydrochloric Acid

Sulfuric Acid

Nitric Acid

Nitrohydrochloric Acid（HCI:HNO3）

50（ventilated）

Dry Gas

Wet Gas

Dry Gas

Wet Gas

Dry/Wet Gas

High Speed Stream

Chromic Acid

Hydrofluoric Acid

Phosphoric Acid

Ferric ChlorideCupric Chloride

Sodium Chloride

Calcium Chloride

Ammonium Chloride

Magnesium Chloride

Ferrous Sulfate

Ammonia

Sodium Hydroxide

Sodium Carbonate

Testing Temperature: Room Temperature

Hydrogen Sulfide

Chlorine

Sulfur Dioxide

Seawater

Formic Acid

Lactic Acid

Oxalic Acid

Citric Acid

Hastelloy Inconel NickelTemperatureChemical Name

Excellent

Good

Satisfactory

Unusable under certain conditions

Unusable

Hydrochloric acid . . .

Sulfuric acid . . .

Temperature

Caution

Room Temperature

Boiling Point

Room Temperature

Boiling Point

Room Temperature

Boiling Point

Room Temperature

Boiling Point

Room Temperature

Boiling Point

Room Temperature

Boiling PointRoom Temperature

Boiling Point

Room Temperature

Boiling Point

Room Temperature

Boiling Point

Room Temperature

Boiling Point

ConcentratedSulfuric Acid

Diluted Sulfuric Acid

DilutedHydrochloric Acid

ConcentratedHydrochloric Acid

Diluted Nitric Acid

Concentrated

Nitric AcidDilutedPhosphoric Acid

DilutedSodium Hydroxide

ConcentratedSodium Hydroxide

ConcentratedPhosphoric Acid

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