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Fits & Tolerances
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Excerpt from JIS B 0401(1986) BASIS OF SELECTION FOR FITS SYSTEM OF LIMITS AND FITSExcerpt from "Usage of JIS series" Manual for Designing (Precision Ver.)
TECHNICAL DATA TECHNICAL DATAFu
nctio
nal c
lass
ifica
tion
Appl
icat
ion
exam
ple
Appl
icab
le p
art
Can be moved relatively
Clearance fitPrecisionrolling fitRolling fitLight rolling fitLoose fit
Cannot be moved relatively
Transition fit
Light press fitDriving fitPush fitLubricated fit
Interference fit
Press fitStrong press fitC
Shrinkage fitCCooling fit
The
part
which
allo
ws a
larg
e cle
aran
ce s
pace
or t
he p
art r
equi
res
clear
ance
spa
ce.
The
part
which
can
be
enlar
ged
to m
ake
clear
ance
spa
ce to
mak
e as
sem
bly
easie
r. Th
e pa
rt wh
ich re
quire
s pr
oper
clea
ranc
e sp
ace
in th
e hi
gh te
mpe
ratu
re.
The
part
whi
ch a
llow
s a
larg
e cl
eara
nce
spac
e or
the
part
requ
ires
clea
ranc
e sp
ace.
Func
tiona
lly, th
e part
whic
h req
uires
larg
e clea
rance
spac
e
For r
educ
ing
Safe
ty c
ost
Prod
uctio
n co
st
Leng
th o
f fit
is lo
ng.
Expa
nse.
Pos
ition
ing
erro
r is
larg
e.
The
gene
ral r
otat
ing
or tr
aveli
ng p
art.
(Th
e co
nditi
on o
f goo
d lu
brica
tion
is re
quire
d.)
Ordi
nary
fit p
arts
.(
Disa
ssem
blin
g is
ofte
n do
ne.)
The
part
whi
ch re
quire
s pr
ecis
ion
mov
emen
t with
out a
ny s
lack
.
The
part
whi
ch
requ
ires
prec
isio
n m
ovem
ent w
ithou
t an
y sl
ack.
Tran
smis
sion
of
pow
er c
an n
ot b
e do
ne b
y on
ly
junc
tion
pow
er o
f fit.
Small
pow
er c
an b
e tra
nsm
itted
by
junc
tion
powe
r of f
it.
Hard
to d
isas
sem
ble
with
out d
amag
ing
com
pone
nts.
Cons
ider
able
pow
er
can
be tr
ansm
itted
by
junc
tion
pow
er o
f fit.
Pres
s di
e pa
rts a
re s
how
n in
the
appl
icat
ion
exam
ple
for t
he it
em w
ritte
n in
red
lette
rs.
Fixa
tion
of b
ushi
ng fo
r bea
ring
Fixa
tion
of d
rivin
g ge
ar a
nd b
oss
Fixa
tion
of jo
int f
lang
e an
d sh
aft( l
arge
torq
ue)
Insert
ion of
valve
seat
for in
let va
lve
Dowe
l pin
MST(
p6)
Fixa
tion
of b
ushi
ng fo
r bea
ring
Join
t and
sha
ft
Ream
er b
olt
Fixa
tion
of g
ear p
ump
shaf
t and
cas
ing
Fit o
f rim
of t
ooth
ed g
ear a
nd b
oss
Gove
rnor
way
and
pin
Fit b
etw
een
join
t fla
nges
Pin
for l
ink
syst
em a
nd le
ver
Key
and
key
groo
veVa
lve
stem
of p
reci
sion
con
trol v
alve
Fit o
f loo
seni
ng s
afet
y pi
n
Pist
on ri
ng a
nd p
isto
n rin
g gr
oove
Cran
k web
and p
in be
aring(
Side
surfa
ce)
Exha
ust v
alve c
age a
nd tr
aveli
ng pa
rt of
sprin
g she
etPi
ston r
ing an
d pist
on ri
ng gr
oove
Fit o
f exh
aust
valv
e se
atM
ain b
earin
g fo
r cra
nksh
aft
Gene
ral t
rave
ling
part
Stri
pper
bol
t MSB(
e9)
Inse
rtion
par
t of c
oolin
g ex
haus
t valv
e ca
geGe
nera
l sha
ft an
d bu
shin
g G
uide
lifte
r pin(
g6)
Leve
r for
ling
sys
tem
and
bus
hing
Fit o
f too
thed
gea
r of p
recis
ion
gear
mec
hani
sm
Fit o
f rim
and
bos
s Do
wel
pin
MST
H(h7)
Fit o
f joi
nt fl
ange
and
sha
ftFix
atio
n of
pist
on o
f hyd
raul
ic sy
stem
and
sha
ftRe
amer
bol
t Do
wel
pin
MST
M(m
6)
Flex
ible
pla
te c
oupl
ing
and
gear
( act
ive
side
)Fi
xatio
n of
gea
r and
sha
ft(sm
all t
orqu
e)Ins
ertion
of va
lve gu
ide fo
r inlet
valve
Straig
ht die
MSD
, etc.(
n5)
Insert
ion of
valve
guide
for in
let va
lve
Die M
HD, e
tc.(m5)
Prec
isio
n fit
Punc
h SP
AS, e
tc.(
m5)
Flex
ible
pla
te c
oupl
ing
and
gear
( pas
sive
sid
e)
The
part
which
allo
ws a
slig
ht c
leara
nce
spac
e or
the
part
requ
ires
clear
ance
sp
ace(
high
gra
de fi
t). T
he b
earin
g pa
rt wh
ich h
as s
light
clea
ranc
e sp
ace
and
good
lubr
icatio
n. T
he b
earin
g pa
rt wh
ich is
wor
king
unde
r the
con
ditio
n of
hig
h te
mpe
ratu
re, h
igh
spee
d an
d hi
gh lo
ad(
high
gra
de p
ress
ure
feed
lubr
icatio
n).
1.1
Com
mon
ly u
sed
hole
-bas
is fi
ts
Clea
ranc
e fit
Basi
c ho
leTr
ansi
tion
fitTo
lera
nce
zone
cla
ss o
f sha
ftIn
terfe
renc
e fit
1.2
Mut
ual r
elat
ions
of t
oler
ance
zon
e in
com
mon
ly u
sed
hole
-bas
is s
yste
m o
f fits
2.1
Com
mon
ly u
sed
shaf
t-bas
is fi
ts
2.2
Mut
ual r
elat
ions
of t
oler
ance
zon
e in
com
mon
ly u
sed
shaf
t-bas
is s
yste
m o
f fits
Basic
shaf
tTo
lera
nce
zone
cla
ss o
f hol
eCl
eara
nce
fitTr
ansi
tion
fitIn
terfe
renc
e fit
Fit w
hich
can
be
mob
ile d
ue to
pro
per c
lear
ance
spa
ce(hi
gh g
rade
fit)
.Th
e ge
nera
l col
d be
arin
g pa
rt of
gre
ase
or o
il lu
bric
atio
n.
The c
ontin
uous
rotar
y par
t of li
ght lo
ad pr
ecisi
on m
achin
e.Fit
whic
h can
be m
obile
in sp
ite of
small
clea
ranc
e spa
ce(sp
igot a
nd po
sition
ing)
.Pr
ecisi
on tr
aveli
ng pa
rt.
Fit w
hich c
an be
mov
ed m
anua
lly w
ith us
ing a
lubric
ator(
high g
rade
posit
ioning).
Spec
ial pr
ecisi
on tr
aveli
ng pa
rt.St
ation
ary p
art w
hich i
s not
of gr
eat im
porta
nce.
Mou
ntin
g pa
rt wh
ich is
give
n a
little
leew
ay.
High
-pre
cisio
n po
sitio
ning
whe
re b
oth
are
imm
ovab
le.Fit
whi
ch c
an b
e as
sem
bled
and
disa
ssem
bled
by
wood
or l
ead
ham
mer
.
Fit w
hich c
an be
asse
mble
d and
disa
ssem
bled b
y an i
ron h
amm
er or
hand
pres
s(Ke
y or s
uch
item
s are
requ
ired t
o pre
vent
othe
r com
pone
nts f
rom
rotat
ing).
High
-pre
cision
posit
ioning
.
Sam
e as
the
abov
e fo
r ass
embl
ing
and
disa
ssem
blin
g.Hi
gh-p
recis
ion
posit
ioni
ng w
hich
doe
s no
t tol
erat
e an
y cle
aran
ce s
pace
.
Fit w
hich
requ
ires
cons
ider
able
powe
r for
ass
embl
ing
and
disa
ssem
blin
g.Hi
gh-p
recis
ion
fixed
mou
ntin
g.(
Key
or s
uch
item
s ar
e re
quire
d fo
r lar
ge to
rque
tra
nsm
issio
n.)
Fit wh
ich re
quire
s much
powe
r for a
ssemb
ling an
d disa
ssemb
ling.(
Key o
r such
items
are r
equire
d for
large
torqu
e tra
nsmiss
ion.)
Howe
ver, w
hen no
n-ferr
ous c
ompo
nents
are fit
ted to
gether
, pres
s fit p
ower
will b
e activ
ated.
Stand
ard pr
ess fit
fixing
betwe
en iro
n and
iron o
r betw
een br
onze
and co
pper.
Sam
e as t
he ab
ove f
or as
sem
bling
and
disas
sem
bling
.Sh
rinka
ge fi
t, co
oling
fit a
nd st
rong
pre
ss fi
t for
larg
e dim
ensio
n co
mpo
nent
s.
Fixe
d fir
mly
toge
ther
, so
that
per
man
ent a
ssem
blin
g ca
n be
sou
ght w
ith
shrin
kage
fit,
cool
ing
fit a
nd s
trong
pre
ss fi
t for
ass
embl
ing.
Pre
ss fi
t for
lig
ht a
lloy.
Notic
e(*)
Fits
will
mak
e ex
cept
ions
acc
ordi
ng to
the
size
ste
ps.
Basi
c ho
le
Fit
Clearance fit
Transition fit
Interference fit
Clea
ranc
e fit Lubricated fit
Trans
ition f
itInt
erfere
nce f
it
Driving fit
Press fit
Strong press fit
Shrinkage fit
Clea
ranc
e fit
Toler
ance z
one c
lass o
f shaf
t
(Om) Variation of tolerance
(Om) Variation of tolerance
Loose rolling fitLight rolling fit
Rolling fit
Clearance fit
Clearance fit
Notic
e(*)
Fits
will
mak
e ex
cept
ions
acc
ordi
ng to
the
size
ste
ps.
*Th
is ta
ble
show
s th
e ca
se w
hen
basi
c si
ze is
ove
r 18m
m to
30m
m.
*Th
is ta
ble
show
s th
e ca
se w
hen
basi
c si
ze is
ove
r 18m
m to
30m
m.
Basic
shaft
Fit
Clearance fit
Transition fit
Interference fit
Clearance fit
Tolera
nce zo
ne clas
s of sh
aft
Transition fit
Interference fit
Clearance fit
Clearance fit
Clearance fit
PD-6 1st
