Table 1. Thread Forms of Gages for Product Internal and External Threads Gage Width approx. central when undercut Maximum Product Internal Thread
0.25 P
P
Pitch cylinder Optional sharp root Clear (see Std.)
P /2 P /4 (Ref.)
60°
H /4 (Ref.)
0.25 H
60° 30°
Pitch cylinder
P /4 width approx. central when undercut Clear P /8 when not undercut
30°
P /2
0.125 H
P
0.375 P (Ref.)
Form of relief optional
Minimum Product External Thread
NOT GO (HI) Working Plug Gage
P /8 width approx. central when undercut Clear P /8 when not undercut
Form of relief optional
Minimum Product Ixternal Thread
GO Ring Gage
P P /8 (Ref.)
P /2
0.375 H
Pitch cylinder
60°
3/8H (Ref.)
P /8 width approx. central when undercut Clear P /8 when not undercut
Pitch cylinder
3/8 H (Ref.)
60°
0.250 H
30° P /4 (Ref.)
Form of relief optional
P /2
P
GO Working Plus Gage
Maximum Product External Thread
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