1261 1262

［TECHNICAL DATA］ DIMENSIONAL TOLERANCES AND FITS Excerpts from JIS B 0401 （1999）［TECHNICAL DATA］BASIS OF SELECTION FOR FITS Excerpts from “Product Manual （Accuracy

Version）” in JIS “How to Use” seriesH6

h8h7

n6n5h6h5

h9

x6u6t6s6r6p6n6m6k6js6h6

r5p5m5k5js5h5

f8f7

c9 e9d9

e8d9

g6f7e7

g5f6

H9H8

H7

Fitti

ng a

nd fi

xing

a b

earin

g bu

shin

g

Fixi

ng a

driv

e ge

ar ri

m a

nd b

oss

toge

ther

Fixing

a co

uplin

g flan

ge an

d sha

ft tog

ether （

large

torq

ue）

Inse

rtion

of s

uctio

n va

lve

and

valv

e se

at

Fitti

ng a

nd fi

xing

a b

earin

g bu

shin

g

Coup

ling

and

shaf

t

Flex

ible

cou

plin

g sh

aft a

nd g

ear （

driv

e si

de）

Fixing

a gear

and s

haft to

gether

（sm

all tor

que）

Dowe

l pin

MST （

p6）

Insert

ion of

suctio

n valv

e and

valve

guide

Strai

ght d

ie MSD

, etc. （

n5）

Insert

ion of

sucti

on va

lve an

d valv

e guid

e Die

MHD,

etc. （

m5）

Prec

isio

n fit

ting

Punc

h SP

AS, e

tc. （

m5）

Fittin

g of fl

exibl

e sha

ft cou

pling

and g

ear （

pass

ive si

de）

Fitti

ng o

f cou

plin

g fla

nge

and

shaf

tFa

sten

ing

of h

ydra

ulic

devic

e pi

ston

s an

d sh

afts

Ream

er b

olt D

owel

pin

MST

M （

m6）

Ream

er b

olt

Fitti

ng o

f gea

r pum

p sh

aft a

nd c

asin

g

Fitti

ng o

f gea

r rim

and

bos

sGo

vern

or p

ath

and

pin

Fitti

ng tw

o co

uplin

g fla

nges

Fitti

ng o

f gea

rs in

a p

reci

sion

gea

r dev

ice

Fitti

ng o

f rim

and

bos

s

Prec

ision

con

trol v

alve

rod

Guid

e lif

ter p

in （

g6）

Key

and

key

groo

veLi

nk d

evic

e pi

n an

d le

ver

Link

dev

ice

leve

r and

bus

hing

Regu

lar s

haft

and

bush

ing

Part

wher

e a co

oled

exha

ust v

alve b

ox is

inse

rted

Regu

lar s

lidin

g pa

rt st

rippe

r bol

t MSB

（e9）

Mai

n be

arin

g fo

r cra

nksh

aft

Fitti

ng o

f exh

aust

val

ve s

eat

Pist

on ri

ng a

nd p

isto

n rin

g gr

oove

Exha

ust v

alve b

ox an

d sp

ring

bear

ing sl

iding

par

tCr

ank

web

and

pin

bea

ring （

side）

Fitti

ng b

y m

eans

of a

loos

e se

t pin

Pist

on ri

ng a

nd p

isto

n rin

g gr

oove

（

is o

ften

disa

ssem

bled）

Regu

lar f

ittin

g pa

rt

（

Mus

t be

wel

l lub

ricat

ed.）

Regu

lar r

otat

ing

or s

lidin

g pa

rt

Mai

nten

ance

cos

t

M

anuf

actu

ring

cost

Cost

nee

ds to

be

redu

ced.

Lon

g fit

ting

leng

th

E

xpan

ds. L

arge

pos

ition

al e

rror

.Pa

rt wh

ich fo

r fun

ction

al re

ason

s req

uires

a lar

ge ga

p

Shrin

kage

pre

ss fi

tting

, cold

pre

ss fi

tting

or f

orce

d pr

ess f

itting

is re

quire

d fo

r lar

ge p

arts

Asse

mbl

y/di

sass

embl

y ar

e th

e sa

me

as th

e ab

ove.

Faste

ned u

sing t

he st

anda

rd pre

ss-fit

ting f

or fas

tening

a fer

rous p

art to

a fer

rous,

bronz

e, or

copp

er pa

rtHo

weve

r, only

light

press

-fittin

g forc

e is r

equir

ed fo

r pres

s-fitti

ng w

hen b

oth pa

rts ar

e non

-ferro

us pa

rts.

Fitting

which

require

s large

force

for ass

embly

/disass

embly

（A ke

y or ot

her de

vice is

require

d for hi

gh-torq

ue tran

smissi

on pur

poses.）

Prec

ision

stati

onary

fittin

g （A k

ey or

othe

r dev

ice is

requ

ired f

or hig

h-torq

ue tra

nsmi

ssion

purpo

ses.）

Fitti

ng w

hich

requ

ires

cons

ider

able

forc

e fo

r ass

embl

y/di

sass

embl

y

Prec

isio

n po

sitio

ning

whi

ch p

erm

its n

o ga

p at

all

Asse

mbl

y/di

sass

embl

y ar

e th

e sa

me

as th

e ab

ove.

Prec

isio

n po

sitio

ning

Fitti

ng w

hich

can

be

asse

mbl

ed/d

isas

sem

bled

usi

ng a

woo

den

or le

ad h

amm

erHi

gh-p

reci

sion

pos

ition

ing

whi

ch lo

cks

both

par

ts in

pla

ce w

hile

uni

t is

in u

seIn

stal

latio

n pa

rt w

hich

is c

ompa

tible

with

a v

ery

smal

l tig

hten

ing

inte

rfere

nce

Unim

porta

nt s

tatio

nary

par

tSp

ecia

l hig

h-pr

ecis

ion

slid

ing

part

Fittin

g whic

h allo

ws m

ovem

ent b

y han

d whe

n a lu

brica

nt is

used

（hig

h-qu

ality

posit

ioning）

High

-pre

cisi

on s

lidin

g pa

rtFi

tting

with

a n

arro

w g

ap a

nd w

hich

per

mits

mov

emen

t （sp

igot

, pos

ition

ing）

Cont

inuo

usly

rota

ting

part

of a

pre

cisi

on m

achi

ne u

nder

ligh

t loa

d

Regu

lar n

orm

al-te

mpe

ratu

re b

earin

g lu

bric

ated

with

gre

ase

or o

il

Fittin

g whic

h pro

vides

an ap

prop

riate

clear

ance

and p

erm

its m

ovem

ent （

high-

quali

ty fit

ting）

.

Beari

ng su

bjecte

d to h

igh te

mpera

ture,

high s

peed

, and

high

load

（hig

h-de

gree

force

d lub

ricati

on）

Fairl

y w

ide

gap

and

wel

l lub

ricat

ed b

earin

gPa

rt wh

ich a

ccom

mod

ates

a fa

irly

wide

gap

, or a

mov

ing

part

which

requ

ires

a ga

p

Part

whi

ch a

ccom

mod

ates

a w

ide

gap,

or w

hich

requ

ires

a w

ide

gap

Part

whi

ch re

quire

s an

app

ropr

iate

gap

eve

n at

hig

h te

mpe

ratu

res

Part

whi

ch a

ccom

mod

ates

a w

ide

gap

to fa

cilit

ate

asse

mbl

yPa

rt wh

ich ac

com

mod

ates a

par

ticula

rly w

ide g

ap, o

r a m

oving

par

t whic

h re

quire

s a g

ap

Appl

icat

ion

exam

ple

Func

tiona

l cla

ssi�

catio

nAp

plic

able

par

t

† T

he it

ems

prin

ted

in re

d in

the

Appl

icat

ion

exam

ple

are

pres

s di

e pa

rts p

rese

nted

in th

is c

atal

ogue

.

Dow

el p

in M

STH （

h7）

Parts can move relative to each other

Clearance fit

Loose fit Loose roll fit Roll fit Tight roll fit

Parts cannot move relative to each other.

Transition fit

Sliding fit Push fit Striking Light press fit

Interference fit

Press fit Strong press fit, shrinkage press fit, cold press fit

Fittin

g wh

ich re

quire

s an

iron

ham

mer

or h

and

pres

s fo

r ass

embl

y/di

sass

embl

y （A

key

or o

ther

dev

ice is

requ

ired

in o

rder

to p

reve

nt in

ter-p

art s

haft

rota

tion.）

Perm

anen

t ass

embl

y in

whi

ch p

arts

are

bot

h tig

htly

fast

ened

toge

ther

and

w

ill n

ot b

e di

sass

embl

ed, a

nd w

hich

requ

ires

shrin

kage

pre

ss fi

tting

, col

d pr

ess

fittin

g, o

r for

ced

pres

s fit

ting.

For

ligh

t allo

ys, o

nly

ordi

nary

pre

ss

fittin

g is

requ

ired.

Part

requ

iring

pre

cisi

on m

otio

n w

ith

alm

ost n

o ga

p

Diffi

cult

to d

isass

embl

e wi

thou

t dam

agin

g th

e pa

rt.

Fitti

ng fo

rce

alon

e is

in

suffi

cien

t for

tra

nsm

ittin

g fo

rce

Fitti

ng fo

rce

alon

g is

su

ffici

ent f

or

trans

mitt

ing

smal

l fo

rce

Diffi

cult

to

disa

ssem

ble

with

out d

amag

ing

the

part.

Fitti

ng fo

rce

is

capa

ble

of

trans

mitt

ing

cons

ider

able

forc

e

H8H7

F8F7

E7

h9h8

h7h6

h6h5

h6h5

H10

H9H8

H7H6

H9H8

E9E8

D10

D9D8

C10

C9B1

0H9

H8F8

E9E8

D9D8

X7U7

T7S7

R7P7

P6K7

N7N6

M7M6

K6JS7

JS6G7

H7H6

G6F7

F6P6

N6M6

K5JS6

M6

h9h8

h7

200

150

100 50 0

-50

d9c9

b9d8

h9h8

e9g8

d9c9

h8h7

f8f7

e9e8

d9x6

u6t6

s6r6

p6n6

m6k6

js7js6

h7h6

g6f7

f6e7

p6n6

m6m5

k6k5

js6js5

h6h5

g6g5

f6

-200

-150

-100-5

0050

H10

H9H8

H7H6

h9h8h7h6h5

X7U7

T7S7

R7

P6

B10

C9 C10

D8 D9 D10

D8D9

E9E8E9E8E7

F8F8F7F7F6G6 G7

H9H6 H6 H7 H7 H8 H9H8H8

JS6

JS6

JS7

K6 K6 K7

M6

M6

M7

x6u6

t6s6

n6m

6m

6m

5

k6k6k5

js7

js6

js6

js5

h8 h8 h9h7h7h6h6h5

g6g6g5f6 f6 f7 f7 f8

e7 e8 e9 e8 e9

d9 d8 d9d9c9c9

b9H1

0

H9H8H7H6p6＊

n6＊

r6＊

P7＊

P6＊

N6 N7N6＊

p6＊

Refer

ence s

haft

＊ C

ases

in w

hich

the

mea

sure

men

t exc

eeds

the

refe

renc

e di

men

sion

in th

e ab

ove

tabl

e （18

mm）

but d

oes

not e

xcee

d 30

mm

.

Hole to

lerance

range c

lass

Fittin

g

（µ

m）

Clea

ranc

e fit

Clos

e fit

Trans

ition f

itCl

eara

nce f

it

Shaft

toler

ance

rang

e clas

s

Fitti

ng

Refe

renc

e ho

le

＊ C

ases

in w

hich

the

mea

sure

men

t exc

eeds

the

refe

renc

e di

men

sion

in th

e ab

ove

tabl

e （18

mm）

but d

oes

not e

xcee

d 30

mm

.

1.2

Corr

elat

ion

of to

lera

nce

rang

es in

�tti

ng w

ith th

e re

gula

rly u

sed

hole

ado

pted

as

refe

renc

e

Note

: ＊Ex

cept

ions

for t

hese

fitti

ngs

may

aris

e de

pend

ing

on th

e di

men

sion

al s

ectio

ning

sch

eme.

2.2

Corr

elat

ion

of to

lera

nce

rang

es in

�tti

ng w

ith th

e re

gula

rly u

sed

shaf

t ado

pted

as

refe

renc

e

Note

: ＊Ex

cept

ions

for t

hese

fitti

ngs

may

aris

e de

pend

ing

on th

e di

men

sion

al s

ectio

ning

sch

eme.

Refer

ence

shaft

Hole

tole

ranc

e ra

nge

clas

sCl

eara

nce

�tTr

ansi

tion

�tCl

ose

�tCl

ose

�tTr

ansi

tion

�tCl

eara

nce

�tSh

aft t

oler

ance

rang

e cl

ass

Refer

ence

hole

2.1

Fitti

ng w

ith re

gula

rly u

sed

shaf

t ado

pted

as

refe

renc

e1.

1 Fi

tting

with

regu

larly

use

d ho

le a

dopt

ed a

s re

fere

nce

（µ

m）

Dimension tolerance

Clearance fit

Transition fit

Close fit

Sliding fit

Striking

Press fit

Forced press fit

Shrinkage press fit

Loose roll fitLight roll fit

Roll fit

Clearance fit

Clearance fit

Dimension tolerance

Clearance fit

Transition fit

Close fit

Clearance fit

Transition fit

Close fit

Clearance fit

Clearance fit

Clearance fit

PD-06.indd 1261-1262 2012/10/25 17:11:35