Limits, Tolerances, and Fits 211
dharm
d:\N-Design\Des15-1.pm5
Fig. 15.3 Graphical illustration of tolerance zones
Fundamental deviation
Negative
Positive
A
EI
B
C
CD
D
EEF
FFGG H
J
JS
K M N P Zero line
RS T
UV X
Y ZZA
ZB
ES
Basic size
ZC
(a) Holes (Internal features)
Fundamental deviation
Negative
Positive
a
es
b
c
cd
d
e ef
ffggh
j
js
kmnp
Zero line r s t
u v x
y zza
zb
ei
Basic size
zc
(b) Shafts (external features)