50
Dimension Dimension Guidelines Guidelines 1. Dimensions should NOT be duplicated, or the same information given in two different ways. Incorrect
Dim
ensio
nD
ime
nsio
n
Gu
ide
line
sG
uid
elin
es
1. D
ime
nsio
ns s
ho
uld
NO
T b
e d
up
lica
ted
, o
r
the
sa
me
in
form
atio
n g
ive
n in
tw
o d
iffe
ren
t
wa
ys.
Inco
rrec
t
1. D
ime
nsio
ns s
ho
uld
NO
T b
e d
up
lica
ted
, o
r
the
sa
me
in
form
atio
n g
ive
n in
tw
o d
iffe
ren
t
wa
ys.
2. N
o u
nn
ece
ssa
ry d
ime
nsio
ns s
ho
uld
be
use
d –
on
ly th
ose
ne
ed
ed
to
pro
du
ce
or
insp
ect th
e p
art
.
Inc
orr
ect
2. N
o u
nn
ece
ssa
ry d
ime
nsio
ns s
ho
uld
be
use
d –
on
ly th
ose
ne
ed
ed
to
pro
du
ce
or
insp
ect th
e p
art
.
3. D
ime
nsio
ns s
ho
uld
be
atta
ch
ed
to
th
e
vie
w th
at b
est sh
ow
s th
e c
on
tou
r o
f th
e
fea
ture
to
be
dim
en
sio
ne
d.
Inco
rrec
t
3. D
ime
nsio
ns s
ho
uld
be
atta
ch
ed
to
th
e
vie
w th
at b
est sh
ow
s th
e c
on
tou
r o
f th
e
fea
ture
to
be
dim
en
sio
ne
d.
4. W
he
ne
ve
r p
ossib
le, a
vo
id d
ime
nsio
nin
g to
hid
de
n lin
es a
nd
fe
atu
res.
Inco
rrec
t
4. W
he
ne
ve
r p
ossib
le, a
vo
id d
ime
nsio
nin
g to
hid
de
n lin
es a
nd
fe
atu
res.
5. A
vo
id d
ime
nsio
nin
g o
ve
r o
r th
rou
gh
th
e
ob
ject.
Inco
rrec
t
5. A
vo
id d
ime
nsio
nin
g o
ve
r o
r th
rou
gh
th
e
ob
ject.
6. A
dim
en
sio
n s
ho
uld
be
atta
ch
ed
to
on
ly
on
e v
iew
; fo
r e
xa
mp
le, e
xte
nsio
n lin
es
sh
ou
ld n
ot co
nn
ect tw
o v
iew
s.
Inco
rrec
t
6. A
dim
en
sio
n s
ho
uld
be
atta
ch
ed
to
on
ly
on
e v
iew
; fo
r e
xa
mp
le, e
xte
nsio
n lin
es
sh
ou
ld n
ot co
nn
ect tw
o v
iew
s.
7. W
he
ne
ve
r p
ossib
le, lo
ca
te d
ime
nsio
ns
be
twe
en
ad
jace
nt vie
ws.
Inco
rrec
t
7. W
he
ne
ve
r p
ossib
le, lo
ca
te d
ime
nsio
ns
be
twe
en
ad
jace
nt vie
ws.
Mu
ltip
le
exte
nsio
n
line
cro
ssin
gs
ma
y b
e
co
nfu
se
d f
or
the
ou
tsid
e
co
rne
r o
f th
e
pa
rt.
8. A
vo
id c
rossin
g e
xte
nsio
n lin
es, b
ut d
o n
ot
bre
ak th
em
wh
en
th
ey d
o c
ross.
9. W
he
ne
ve
r p
ossib
le, a
vo
id s
en
din
g
exte
nsio
n lin
es th
rou
gh
ob
ject vie
ws.
Inco
rrec
t
9. W
he
ne
ve
r p
ossib
le, a
vo
id s
en
din
g
exte
nsio
n lin
es th
rou
gh
ob
ject vie
ws.
10
. In
ge
ne
ral, a
cir
cle
is d
ime
nsio
ne
d b
y its
dia
me
ter
an
d a
n a
rc b
y its
ra
diu
s.
11. H
ole
s a
re lo
ca
ted
by th
eir
ce
nte
rlin
es,
wh
ich
ma
y b
e e
xte
nd
ed
an
d u
se
d a
s
exte
nsio
n lin
es.
12
. H
ole
s s
ho
uld
be
lo
ca
ted
an
d s
ize
d in
th
e
vie
w th
at sh
ow
s th
e fe
atu
re a
s a
cir
cle
.
Inc
orr
ect
12
. H
ole
s s
ho
uld
be
lo
ca
ted
an
d s
ize
d in
th
e
vie
w th
at sh
ow
s th
e fe
atu
re a
s a
cir
cle
.
13
. D
o n
ot cro
ss a
dim
en
sio
n lin
e w
ith
an
exte
nsio
n lin
e, a
nd
avo
id c
rossin
g
dim
en
sio
ns w
ith
le
ad
er
line
s.
13
. D
o n
ot cro
ss a
dim
en
sio
n lin
e w
ith
an
exte
nsio
n lin
e, a
nd
avo
id c
rossin
g
dim
en
sio
ns w
ith
le
ad
er
line
s.
14
. L
ea
de
r lin
es p
oin
t to
wa
rd th
e c
en
ter
of th
e
fea
ture
, a
nd
sh
ou
ld n
ot o
ccu
r h
ori
zo
nta
lly
or
ve
rtic
ally
.
15
. D
ime
nsio
n n
um
be
rs s
ho
uld
be
ce
nte
red
be
twe
en
arr
ow
he
ad
s, e
xce
pt w
he
n u
sin
g
sta
cke
d d
ime
nsio
ns, a
nd
th
en
th
e n
um
be
rs
sh
ou
ld b
e s
tag
ge
red
.
Inco
rrec
t
15
. D
ime
nsio
n n
um
be
rs s
ho
uld
be
ce
nte
red
be
twe
en
arr
ow
he
ad
s, e
xce
pt w
he
n u
sin
g
sta
cke
d d
ime
nsio
ns, a
nd
th
en
th
e n
um
be
rs
sh
ou
ld b
e s
tag
ge
red
.
16
. C
on
ce
ntr
ic c
ircle
s a
re d
ime
nsio
ne
d in
th
e
lon
gitu
din
al vie
w, w
he
ne
ve
r p
ractica
l.
Inco
rrec
t
16
. C
on
ce
ntr
ic c
ircle
s a
re d
ime
nsio
ne
d in
th
e
lon
gitu
din
al vie
w, w
he
ne
ve
r p
ractica
l.
Dim
en
sio
nin
g
Dim
en
sio
nin
g
Sta
nd
ard
sS
tan
da
rds
Ru
les a
nd
Pra
ctice
s
A
ccu
rate
dim
en
sio
nin
g is o
ne
of
the
mo
st
de
ma
nd
ing
un
de
rta
kin
gs w
he
n d
esig
nin
g p
art
s.
U
se
th
e c
he
cklis
t to
in
su
re y
ou
ha
ve
fo
llow
ed
th
e
ba
sic
dim
en
sio
nin
g r
ule
s.
K
ee
p in
min
d t
he
re m
ay b
e a
ca
se
wh
ere
th
e
ne
ed
to
bre
ak a
sta
nd
ard
co
uld
occu
r to
giv
e
cla
rity
to
th
e p
art
an
d m
an
ufa
ctu
rer.
Sta
nda
rds
In
ord
er
for
the d
raw
ing
s to
be
dim
en
sio
ne
d s
o
tha
t a
ll p
eo
ple
ca
n u
nd
ers
tand
th
em
, w
e n
eed
to
follo
w s
tand
ard
s th
at
eve
ry c
om
pa
ny in
th
e
wo
rld m
ust
follo
w. S
tan
da
rds a
re c
rea
ted b
y
the
se o
rgan
iza
tio
ns:
-AN
SI
-MIL
-IS
O-D
OD
-DIN
-CE
N
-JIS
Sta
nd
ard
s In
stitu
tio
ns
A
NS
I -
Am
eri
ca
n N
atio
na
l S
tan
da
rds I
nstitu
te
- T
his
in
stitu
te c
rea
tes th
e e
ng
ine
eri
ng
sta
nd
ard
s fo
r N
ort
h A
me
rica
.
IS
O -
Inte
rna
tio
na
l O
rga
niz
atio
n fo
r
Sta
nd
ard
iza
tio
n -
Th
is is a
wo
rld
wid
e
org
an
iza
tio
n th
at
cre
ate
s e
ng
ine
eri
ng
sta
nd
ard
s w
ith
ap
pro
xim
ate
ly 1
00
pa
rtic
ipa
tin
g c
ou
ntr
ies.
Sta
nd
ard
s In
stitu
tio
ns
D
IN -
De
uts
ch
es In
stitu
t fü
r N
orm
un
g -
Th
e
Ge
rma
n S
tan
da
rds I
nstitu
te c
rea
ted
ma
ny
sta
nd
ard
s u
se
d w
orl
d w
ide
su
ch
as t
he
sta
nd
ard
s f
or
ca
me
ra f
ilm.
JIS
- J
ap
an
ese
In
du
str
ial S
tan
da
rd -
Cre
ate
d
aft
er
WW
II f
or
Ja
pa
ne
se
sta
nd
ard
s.
C
EN
- E
uro
pe
an
Sta
nd
ard
s O
rga
niz
atio
n
Sta
nd
ard
s In
stitu
tio
ns
T
he
Un
ite
d S
tate
s m
ilita
ry h
as t
wo
org
an
iza
tio
ns
tha
t d
eve
lop
sta
nd
ard
s.
D
OD
- D
ep
art
me
nt
Of
De
fen
se
M
IL -
Mili
tary
Sta
nd
ard
Lin
ea
r d
ime
nsio
ns a
re c
om
pri
se
d o
f
fou
r co
mp
on
en
ts:
Exte
nsio
n
Lin
es
Dim
en
sio
n T
ex
tD
ime
ns
ion
Lin
es Arr
ow
Head
s
Exte
nsio
n L
ine
s
Exte
nd
ed fro
m th
e
vie
w to in
dic
ate
th
e
edg
es r
efe
ren
ced
and
hold
th
e
dim
en
sio
n lin
e
1/1
6”
gap f
rom
th
e
vie
w s
o the
y a
re n
ot
co
nfu
se
d w
ith
the
vis
ible
lin
es
Con
tinu
e 1
/8”
past
the d
ime
nsio
n lin
e
Dim
en
sio
n L
ines
Ho
rizon
tal
Alig
ne
d t
o a
sla
nte
d
su
rfa
ce
d
Vert
ica
l
Wh
en
sta
cke
d, th
ey
are
10m
m (
.4”)
fro
m
the v
iew
an
d
6m
m(.
25”)
apart
.
Arr
ow
hea
ds
(Dim
en
sio
n L
ine
Term
ina
tor)
Arr
ow
he
ad
s a
re typ
ica
l d
ime
nsio
n lin
e t
erm
ina
tors
. T
he
re a
re o
the
r
acce
pta
ble
dim
en
sio
n lin
e te
rmin
ato
rs.
Arr
ow
he
ad
s p
oin
t d
irectly
to th
e o
bje
ct th
at is
be
ing
dim
en
sio
ne
d o
r th
e
exte
nsio
n lin
es a
t th
e e
nd
of th
e d
ime
nsio
n.
Arr
ow
he
ad
s a
re m
ade
thre
e tim
es a
s lo
ng
as
the
y a
re w
ide.
Do
t
Ob
lique
or
arc
hite
ctu
ral ticks
used
in a
rch
ite
ctu
ral d
raw
ing
sD
atu
m
Dim
ensio
n T
ext
Dim
ensio
n te
xt is
pla
ced
in
th
e
mid
dle
of th
e lin
e
both
ho
rizo
nta
lly
and
ve
rtic
ally
.
If t
he d
ime
nsio
n t
ext w
ill n
ot fit be
twee
n the
exte
nsio
n lin
es, it m
ay b
e p
laced
outs
ide
the
m.
Dim
en
sio
nin
g M
eth
od
s
D
ime
nsio
ns a
re r
ep
rese
nte
d o
n a
dra
win
g u
sin
g
on
e o
f tw
o s
yste
ms,
un
idir
ectio
na
l o
r a
lign
ed
.
T
he
un
idir
ectio
na
l m
eth
od
me
ans a
ll d
ime
nsio
ns
are
re
ad
in
th
e s
am
e d
ire
ctio
n.
T
he
alig
ne
d m
eth
od
me
an
s t
he
dim
en
sio
ns a
re
rea
d in
alig
nm
en
t w
ith
th
e d
ime
nsio
n lin
es o
r
sid
e o
f th
e p
art
, s
om
e r
ea
d h
ori
zo
nta
lly a
nd
oth
ers
re
ad v
ert
ica
lly.
Dim
en
sio
n T
ext
Un
idir
ectio
na
l vs. A
lign
ed
Un
idir
ectio
nal
dim
ensio
ns a
re p
lace
d
so
th
ey c
an
be
re
ad
fro
m
the
bott
om
of
the
dra
win
g s
hee
t. T
his
me
thod
is c
om
mon
ly
used
in m
ech
an
ical
dra
ftin
g.
Alig
ne
d d
imen
sio
ns a
re p
lace
d
so t
he h
orizo
nta
l d
imen
sio
ns c
an
be
re
ad
fro
m t
he b
ott
om
of
the
dra
win
g s
he
et
and
the
ve
rtic
al
dim
en
sio
ns c
an b
e r
ead
fro
m t
he
rig
ht
sid
e o
f th
e d
raw
ing s
he
et.
Th
is m
eth
od is c
om
mo
nly
use
d in
arc
hitectu
ral an
d s
tructu
ral
dra
ftin
g.
Typ
es o
f D
ime
nsio
ns
T
he
re a
re t
wo
cla
ssific
atio
ns o
f d
ime
nsio
ns:
siz
e
an
d lo
ca
tio
n.
S
ize
d
ime
nsio
ns a
re p
lace
d in
dir
ect
rela
tion
sh
ip t
o a
fe
atu
re t
o id
en
tify
th
e s
pe
cific
siz
e.
L
oca
tio
n d
ime
nsio
ns a
re u
se
d t
o id
en
tify
th
e
rela
tion
sh
ip o
f a
fe
atu
re t
o a
no
the
r fe
atu
re w
ith
in
an
ob
ject.
Dim
en
sio
nin
g C
he
cklis
t
Ea
ch
dim
en
sio
n s
ho
uld
be
wri
tte
n c
lea
rly
with
on
ly o
ne
wa
y to
be
in
terp
rete
d.
A
fe
atu
re s
ho
uld
be
dim
en
sio
ne
d o
nly
on
ce
.
D
ime
nsio
n a
nd
exte
nsio
n lin
es s
ho
uld
no
t
cro
ss.
E
ach
fe
atu
re s
ho
uld
be
dim
en
sio
ne
d.
D
ime
nsio
n fe
atu
res o
r su
rfa
ce
s s
ho
uld
be
do
ne
to
a lo
gic
al re
fere
nce
po
int.
Dim
en
sio
n C
he
cklis
t
D
ime
nsio
n c
ircle
s s
ho
uld
ha
ve
d
iam
ete
rs a
nd
arc
s w
ith
a r
ad
ius.
A
ce
nte
r lin
e s
ho
uld
be
exte
nd
ed
an
d
use
d a
s a
n e
xte
nsio
n lin
e.
D
ime
nsio
n fe
atu
res o
n a
vie
w s
ho
uld
cle
arl
y s
ho
w its
tru
e s
ha
pe
.
E
no
ug
h s
pa
ce
sh
ou
ld b
e p
rovid
ed
to
a
vo
id c
row
din
g a
nd
mis
inte
rpre
tatio
n.
Dim
en
sio
n C
he
cklis
t
E
xte
nsio
n lin
es a
nd
ob
ject
line
s
sh
ou
ld n
ot
ove
rla
p.
D
ime
nsio
ns s
ho
uld
be
pla
ce
d o
uts
ide
the
pa
rt.
C
en
ter
line
s o
r m
ark
s s
ho
uld
be
use
d
on
all
circle
s a
nd
ho
les.
Lin
ea
r D
ime
nsio
nin
g
D
ime
nsio
nin
g fro
m fe
atu
re to
fe
atu
re
is k
no
wn
as C
ha
in D
ime
nsio
nin
g..
It
is c
om
mo
nly
use
d a
nd
ea
sy to
la
y
ou
t. It d
oe
s h
ave
po
ssib
le
co
nse
qu
en
ce
s in
th
e m
an
ufa
ctu
rin
g
of
a p
art
.Tole
ran
ce
s c
an
a
ccu
mu
late
, m
akin
gth
ee
nd
pro
du
ct
larg
er
or
sm
alle
r th
an
exp
ecte
d.
Ch
ain
Dim
en
sio
nin
g
Th
is is a
ge
ne
ral n
ote
. It
ind
ica
tes t
ha
t a
ll tw
o
pla
ce
de
cim
al
dim
en
sio
ns h
ave
a
tole
ran
ce
of
plu
s o
r
min
us .
01
in
ch
un
less
oth
erw
ise
sp
ecifie
d.
Ch
ain
Dim
en
sio
nin
gE
ach
of th
ese
ste
ps
ca
n r
an
ge
be
twe
en
.
49
0”
an
d .5
10
” w
ide
.
Ch
ain
Dim
en
sio
nin
g
Th
e c
ha
in d
ime
nsio
nin
g
layo
ut ca
n h
ave
an
effe
ct o
n th
e f
ina
l le
ng
th
of th
e p
art
ra
ng
ing f
rom
1.4
7
to
1.5
3.
Ch
ain
Dim
en
sio
nin
g
Pla
cin
g a
n o
ve
rall
dim
ensio
n
will
lim
it th
e c
hain
effe
ct o
f th
e
tole
ran
ce b
uild
up
.
Lin
ea
r D
ime
nsio
nin
g
T
he
accu
racy o
f th
e fin
al p
rod
uct is
de
term
ine
d b
y th
e d
ime
nsio
ns o
n th
e
dra
win
g. If a
ll th
e d
ime
nsio
ns o
rig
ina
te
fro
m a
co
mm
on
co
rne
r o
f th
e p
art
, th
e
ob
ject w
ill b
e m
ore
accu
rate
. T
his
is
refe
rre
d to
as D
atu
m D
ime
nsio
nin
g.
Da
tum
s in
su
re th
e to
lera
nce
or
err
ors
in
ma
nu
factu
rin
g d
o n
ot a
ccu
mu
late
.
Da
tum
Dim
en
sio
nin
g
The d
imensio
ns
ori
gin
ate
fro
m a
com
mon e
dge (DATUM)
of
the p
art
.
Da
tum
Dim
en
sio
nin
gTh
e d
imensio
ns
ori
gin
ate
fro
m a
com
mon e
dge
(DATUM)
of
the p
art
.
Th
is is a
ge
ne
ral n
ote
. It
ind
ica
tes t
ha
t a
ll tw
o p
lace
de
cim
al d
ime
nsio
ns h
ave a
tole
ran
ce
of
plu
s o
r m
inu
s .
01
in
ch
un
less o
therw
ise
spe
cifie
d.
Da
tum
Dim
en
sio
nin
g
Th
is s
tep
ca
n b
e .4
90
to .5
10
wid
e.
Th
is d
ista
nce
ca
n
be .9
90 to
1.0
10
wid
e.
Th
is d
ista
nce c
an
be
1.4
9 to
1.5
10
wid
e.
Dim
en
sio
nin
g S
ym
bo
ls
Dim
en
sio
nin
g A
ng
les
A
ng
led
su
rfa
ce
ma
y b
e d
ime
nsio
ne
d
usin
g c
oo
rdin
ate
me
tho
d t
o s
pe
cify t
he
two
lo
ca
tio
n d
ista
nce
s o
f th
e a
ng
le.
A
ng
led
su
rfa
ce
s m
ay a
lso
be
dim
en
sio
ne
d u
sin
g t
he
an
gu
lar
me
tho
d b
y s
pe
cifyin
g o
ne
lo
ca
tio
n
dis
tan
ce
an
d t
he
an
gle
.
Dim
en
sio
nin
g A
ng
les
Coo
rdin
ate
Me
tho
dA
ng
ula
r M
eth
od
Dim
en
sio
nin
g A
rcs a
nd
Cir
cle
s
A
rcs a
nd
cir
cle
s a
re d
ime
nsio
ne
d in
vie
ws
tha
t sh
ow
th
e a
rc o
r cir
cle
.
A
rcs a
re d
ime
nsio
ne
d w
ith
a le
ad
er
to
ide
ntify
th
e r
ad
ius; in
so
me
ca
se
s, a
ce
nte
r m
ark
is in
clu
de
d.
C
ircle
s s
ho
uld
ha
ve
a c
en
ter
ma
rk a
nd
are
d
ime
nsio
ne
d w
ith
a le
ad
er
to id
en
tify
th
e
dia
me
ter.
Dim
en
sio
nin
g C
urv
ed
Fe
atu
res
an
d A
rcs
Use
a c
ap
ital “R
” fo
r
dim
en
sio
nin
g a
rcs.
La
rge A
rcs u
se c
ente
r
ma
rks.
Sm
all
arc
s d
o n
ot
nee
d
ce
nte
r m
ark
s.
Arr
ow
ca
n
be
outs
ide.
Th
e a
rro
w c
an
be
insid
e
for
sm
all
arc
s.
Dia
mete
rsA
full
cir
cu
lar
ob
ject
sh
ou
ld b
e d
ime
nsio
ne
d
usin
g its
dia
mete
r.H
ole
s s
ho
uld
use h
ole
no
tes.
Th
is s
pe
cific
atio
n
ca
lls fo
r a
ho
le w
ith
a .5
dia
me
ter
an
d 1
.00
de
ep
.
Dia
mete
rsC
ylin
dri
cal pa
rts m
ay s
ho
w t
heir
dia
me
ters
in t
his
ma
nne
r.D
imen
sio
nin
g o
n t
he r
ight
sid
e v
iew
cou
ld b
e to
o c
row
ded
.
Note
th
at
the
dia
me
ter
sym
bol is
used
so
it
is n
ot
con
fuse
d w
ith
a lin
ear
dim
en
sio
n.
Ch
ord
s
Ch
ord
s m
ay b
e d
imen
sio
ne
d in
one
of
the
fo
llow
ing w
ays.
Dim
en
sio
nin
g C
urv
ed
Fe
atu
res
Datu
m
Po
ints
are
pla
ced
alo
ng
th
e c
onto
ur
and
are
dim
ensio
ne
d fro
m t
he d
atu
m.
Re
fere
nce
Dim
en
sio
ns
De
sig
na
tes m
ore
th
an
on
e o
f th
e s
am
e fe
atu
re.
In th
is c
ase
, it is id
en
tify
ing
th
ere
are
two
id
en
tica
l h
ole
s.
Ch
am
fers
Exte
rnal ch
am
fer
for
45
deg
ree
cha
mfe
rs o
nly
.
Th
ere
are
tw
o o
ptio
ns.
Exte
rna
l ch
am
fer
for
ang
les o
the
r th
an
45
de
gre
es.
Inte
rna
l cha
mfe
rs.
Fill
ets
an
d R
ou
nd
s
Rou
nd
s
Fill
ets
Fill
ets
an
d R
ou
nd
s
Use a
ca
pita
l “R
” fo
r
dim
en
sio
nin
g t
he a
rc.
La
rge
arc
s u
se
ce
nte
r m
ark
s.
Sm
all
arc
s d
o n
ot
nee
d
ce
nte
r m
ark
s.
Arr
ow
ca
n
be
outs
ide
the
arc
.
Co
nic
al Tap
ers
Slo
t D
ime
nsio
nin
g
Th
e tw
o m
eth
od
s
sh
ow
n o
n the
le
ft
are
th
e a
ccepta
ble
me
tho
ds for
dim
ensio
nin
g s
lotte
d
ho
les.
Dim
en
sio
nin
g R
ad
ial
Pa
tte
rns
An
gle
s a
nd
ra
diu
s v
alu
es
are
use
d t
o loca
te t
he
ce
nte
rs
of
rad
ial p
att
ern
ed f
eatu
res,
su
ch
as t
he
ho
les o
n
this
pla
te.
Ke
yw
ay a
nd
Ke
ysea
t
Ke
yw
ay
Keyse
at
Sha
ft
Ke
yw
ays
Keyw
ay D
ime
nsio
ns
Ho
le D
ime
nsio
nin
g
Hole
s a
re s
pe
cifie
d
with n
um
be
rs a
nd
sym
bo
ls.
Re
ad
ing
a H
ole
No
te
Th
e H
ole
Dia
me
ter
is .
25
” a
nd
will
be d
rille
d .
75”
de
ep.
Th
e H
ole
will
be
Co
un
terb
ore
d t
o
a .
38
”dia
mete
r an
d t
o a
dep
th o
f .2
5”
De
pth
Sym
bo
l
Co
un
terb
ore
or
Sp
otf
ace
Sym
bo
l
Re
ad
ing
a H
ole
No
te
Th
e H
ole
Dia
me
ter
will
be
.38
” d
rille
d .
5 d
eep
.
Re
ad
ing
a H
ole
No
te
Th
e H
ole
Dia
me
ter
will
be .
38”
thro
ugh
the
wh
ole
blo
ck.
Re
ad
ing
Th
rea
d N
ote
s
Th
rea
ds a
re d
imen
sio
ned
with
the u
se
of
local n
ote
s.
We w
ill
dis
cu
ss t
wo
me
thod
s:
the I
SO
an
d t
he
Un
ifie
d N
atio
na
l T
hre
ad
me
tho
d.
Re
ad
ing
a U
nifie
d N
ation
al
Thre
ad N
ote
Ma
jor
Dia
me
terT
hre
ads p
er
Inch
Ide
ntifie
s c
oars
e o
r fin
e
thre
ad.
In th
is c
ase,
C f
or
coa
rse
.
F is f
or
fine
.
Re
ad
ing
a IS
O T
hre
ad
No
tes
M f
or
Metr
ic
No
min
al D
iam
ete
r
In M
illim
ete
rs
Pitch
of
the
thre
ad
s.
Th
is n
um
be
r ca
n b
e 3
,4,5
,6,7
,8,9
.
It is t
he
gra
de
of to
lera
nce in
the
thre
ads
fro
m f
ine
to
co
ars
e.
Th
e H
is fo
r a
llow
an
ce:
G w
ou
ld b
e a
tig
ht
allo
wa
nce
and
H is n
o a
llow
an
ce
.
Pri
or
to T
HR
U,
you
ma
y h
ave
an L
H
for
left h
and
th
rea
d.
Fin
ally
TH
RU
or
a d
ep
th m
ay
be
spe
cifie
d.
To
lera
nc
es
To
lera
nc
es
Vari
ati
on
is
Un
av
oid
ab
le•
No
tw
o m
an
ufa
ctu
red
ob
jec
ts
are
id
en
tic
al in
eve
ry w
ay.
So
me d
eg
ree
of
va
ria
tio
n w
ill
ex
ist.
•E
ng
inee
rs a
pp
ly t
ole
ran
ce
s t
o
pa
rt d
ime
ns
ion
s t
o r
ed
uc
e t
he
am
ou
nt
of
va
ria
tio
n t
hat
AN
SI/A
SM
E S
tan
dard
AN
SI/A
SM
E S
tan
da
rd Y
14
.5
Ea
ch
dim
en
sio
n s
ha
ll h
av
e a
to
lera
nc
e,
ex
ce
pt
tho
se
dim
en
sio
ns
sp
ec
ific
ally
ide
nti
fie
d a
s r
efe
ren
ce
, m
ax
imu
m,
min
imu
m, o
r s
toc
k. T
he
to
lera
nc
e m
ay
be
ap
plie
d d
ire
ctl
y t
o t
he
dim
en
sio
n o
r
ind
ica
ted
by
a g
en
era
l n
ote
lo
ca
ted
in
th
e
titl
e b
loc
k o
f th
e d
raw
ing
.
To
lera
nc
e
sA
to
lera
nc
e is
an
ac
ce
pta
ble
am
ou
nt
of
dim
en
sio
na
l
va
ria
tio
n t
ha
t w
ill
sti
ll a
llo
w a
n
ob
jec
t to
fu
nc
tio
n
co
rre
ctl
y.
To
lera
nc
e
sA
to
lera
nc
e is
an
ac
ce
pta
ble
am
ou
nt
of
dim
en
sio
na
l
va
ria
tio
n t
ha
t w
ill
sti
ll a
llo
w a
n
ob
jec
t to
fu
nc
tio
n
co
rre
ctl
y.
To
lera
nc
e
s
Th
ree
ba
sic
tole
ran
ce
s t
ha
t
oc
cu
r m
os
t o
fte
n
on
wo
rkin
g
dra
win
gs
are
: lim
it
dim
en
sio
ns
,
un
ila
tera
l, a
nd
bila
tera
l to
lera
nc
es
.
To
lera
nc
e
s
To
lera
nc
e
sT
hre
e b
as
ic
tole
ran
ce
s t
ha
t
oc
cu
r m
os
t o
fte
n
on
wo
rkin
g
dra
win
gs
are
: lim
it
dim
en
sio
ns
,
un
ila
tera
l, a
nd
bila
tera
l to
lera
nc
es
.
Lim
it
Dim
en
sio
ns
Lim
it d
ime
ns
ion
s a
re
two
dim
en
sio
na
l v
alu
es
sta
ck
ed
on
to
p o
f e
ac
h
oth
er.
Th
e d
ime
ns
ion
s
sh
ow
th
e la
rge
st
an
d
sm
alle
st
va
lue
s a
llo
we
d.
An
yth
ing
in
be
twe
en
the
se
va
lue
s is
ac
ce
pta
ble
.
Th
es
e a
re lim
it d
ime
ns
ion
s,
be
ca
us
e t
he
up
pe
r a
nd
low
er
dim
en
sio
na
l s
ize
s a
re
sta
ck
ed
on
to
p o
f e
ac
h o
the
r.
Lim
it
Dim
en
sio
ns
Un
ila
tera
l
To
lera
nc
eA
un
ila
tera
l
tole
ran
ce
ex
ists
wh
en
a t
arg
et
dim
en
sio
n is
giv
en
alo
ng
wit
h a
tole
ran
ce
th
at
allo
ws
va
ria
tio
n t
o o
cc
ur
in
on
ly o
ne
dir
ec
tio
n.
Th
is t
ole
ran
ce
is
un
ila
tera
l, b
ec
au
se
the
siz
e m
ay
on
ly
de
via
te in
on
e d
ire
cti
on
.
Un
ila
tera
l
To
lera
nc
e
Bil
ate
ral
To
lera
nc
eA
bila
tera
l
tole
ran
ce
ex
ists
if
the
va
ria
tio
n f
rom
a
targ
et
dim
en
sio
n is
sh
ow
n o
cc
urr
ing
in
bo
th t
he
po
sit
ive
an
d n
eg
ati
ve
dir
ec
tio
ns
.
If n
o t
ole
ran
ce
s a
re s
pe
cif
ied
at
the
dim
en
sio
n le
ve
l, t
he
n g
en
era
l to
lera
nc
es
ma
y b
e a
pp
lie
d b
y d
elib
era
tely
co
ntr
ollin
g
the
nu
mb
er
of
va
lue
s p
as
t th
e d
ec
ima
l
po
int
on
ea
ch
dim
en
sio
n.
Gen
era
l
To
lera
nc
es
Lin
ea
r D
ime
ns
ion
s
X.X
=±
.02
0
X.X
X=
±.0
10
X.X
XX
=±
.00
5
An
gle
s=
±.5
°
Gen
era
l
To
lera
nc
es
To
lera
nc
es
X.X
=±
.02
0
X.X
X=
±.0
10
X.X
XX
=±
.00
5
Th
e t
ota
l to
lera
nc
e is
a v
alu
e t
ha
t
de
sc
rib
es
th
e m
ax
imu
m a
mo
un
t o
f
va
ria
tio
n.
To
lera
nc
e =
.0
10
.50
0
.02
0
.49
0.5
10
Targ
et
Dim
en
sio
n
To
tal
To
lera
nc
e
To
tal T
ole
ran
ce
= .
02
0
A m
ea
su
rin
g d
ev
ice
sh
ou
ld b
e a
ble
to
ac
cu
rate
ly m
ea
su
re w
ith
in 1
/10
th o
f th
e
tota
l b
lue
pri
nt
tole
ran
ce
id
en
tifi
ed
.
To
tal
To
lera
nc
e
.50
0
.02
0
.49
0.5
10
Targ
et
Dim
en
sio
n
To
tal to
lera
nc
e=
.02
01 10
=.0
20
x1
0x
=
.02
0x
=
.00
2
In t
his
ca
se
, a
me
as
uri
ng
de
vic
e
sh
ou
ld b
e a
ble
to
ta
ke
ac
cu
rate
me
as
ure
me
nts
to
wit
hin
tw
o
tho
us
an
dth
s o
f a
n in
ch
.
To
lera
nce
s a
nd
Me
as
uri
ng
X =
th
e m
inim
um
Th
ree
Typ
es o
f F
it
Th
ere
are
th
ree
typ
es o
f fit
tha
t sh
ou
ld b
e
co
nsid
ere
d w
he
n w
ork
ing
with
to
lera
nce
s.
•C
lea
ran
ce
Fit
- h
ave
lim
its o
f siz
e s
o p
rescri
be
d tha
t a
cle
ara
nce
alw
ays r
esults w
hen
ma
ting
pa
rts a
re
assem
ble
d.
•In
terf
ere
nce
Fit
- h
ave lim
its o
f siz
e s
o p
rescri
be
d t
hat a
n
inte
rfe
ren
ce a
lways r
esults w
he
n m
atin
g p
art
s a
re
assem
ble
d.
•T
ran
sitio
n F
it- h
ave lim
its o
f siz
e ind
ica
tin
g tha
t e
ithe
r a
cle
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