Machinery's Handbook, 31st Edition
Metric Self-Threading Screws 1849 Table 1. ANSI Standard Threads and Points for Metric Thread Forming and Thread Cutting Tapping Screws ANSI/ASME B18.6.5M-2000 (Withdrawn)
L
d 2
45° ±5°
D 1
Flat Width
Slight Radius Permissible
Type AB
Z
60°
Y
D 2
D 3
Detail of Thread Form
D 1
DETAIL OF THREAD FORM
L Type B
L
Y
D 2
D 3
Flat Width
D 1
Slight Radius Permissible
TYPE BF
60°
L
Detail of Thread Form
Y
D 2
D 3
DETAIL OF THREAD FORM
D 1
TYPE BT
L
L
Y
Y
D 3
D 3
D 1
D 1
TYPE F
TYPE D
L
Y
D 3
D 1
TYPE T
See Table 3 and Table 4 for thread data. Thread Forming Tapping Screws: These types are generally for application in materials where large internal stresses are permissible or desirable, to increase resistance to loosen ing. These screws have the following descriptions and applications:
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