Machinery's Handbook, 31st Edition
SELF-THREADING SCREWS 1835 Table 1. ANSI Standard Threads and Points for Thread Forming Self-Tapping Screws ANSI/ASME B18.6.3-2013
Flat Width
Slight Radius Permissible
L
D 2
60°
45° ±5°
D
Detail of Thread Form
Type A (Not recommended)
Flat Width
Slight Radius Permissible
L
d
60°
45° ±5°
D
Detail of Thread Form
Type AB
S P
d
Flat Width
Slight Radius Permissible
D
Type B
60°
L
d
Detail of Thread Form
40° ±8°
D
S
Type BP
H
45°–65° L
S
L
S
P
P
D
A
D
Type C (Not recommended)
Type U
See Table 3, Table 5, and Table 6 for thread data.
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