ASME B 18.6.4 - 1998 (R2005) Cross Recessed Big Flat Head Self-Tapping Screws

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Unit:

Thread Size
d

2#

3#

4#

PP
d	Nominal Diameter
d_k	max
d_k	min
k	max
k	min
M	Ref.
t	Ref.
N	Ref.
Socket No.
Penetration depth	max
Penetration depth	min

56	48	40
0.0860	0.0990	0.1120
0.194	0.226	0.257
0.180	0.211	0.241
0.053	0.061	0.069
0.044	0.051	0.059
0.098	0.104	0.106
0.050	0.058	0.060
0.018	0.018	0.018
1	1	1
0.052	0.059	0.062
0.034	0.042	0.044

①,Material 1）Tapping screws are normally fabricated from carbon steel of high quality，such as AISI 1016, 1018, 1019, 1021, 1022, or 1024, either killed or capped but not rimmed. 2）also be made from corrosion resistant steel, brass, monel, and aluminum alloys. The materials and properties shall be as mutually agreed upon between the manufacturer and purchaser.

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