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

Unit: inch

美标ASME B18.6.4 - 1998 ASME18.6.4 18.6.4A Cross Recessed Big Flat Head Self-Tapping Screws

Screw Thread
d

10#

1/4

5/16

3/8

7/16

1/2

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	40	32	32	24	20	18	16	14	13
0.0860	0.0990	0.1120	0.1250	0.1380	0.1640	0.1900	0.2500	0.3125	0.3750	0.4375	0.5000
0.194	0.226	0.257	0.289	0.321	0.384	0.448	0.573	0.698	0.823	0.948	1.073
0.180	0.211	0.241	0.272	0.303	0.364	0.425	0.546	0.666	0.787	0.907	1.028
0.053	0.061	0.069	0.078	0.086	0.102	0.118	0.150	0.183	0.215	0.248	0.280
0.044	0.051	0.059	0.066	0.074	0.088	0.103	0.133	0.162	0.191	0.221	0.250
0.098	0.104	0.106	0.122	0.152	0.166	0.182	0.256	0.346	0.376	0.408	0.438
0.050	0.058	0.060	0.076	0.072	0.086	0.102	0.130	0.180	0.214	0.244	0.276
0.018	0.018	0.018	0.019	0.027	0.029	0.030	0.033	0.059	0.063	0.068	0.072
1	1	1	1	2	2	2	3	4	4	4	4
0.052	0.059	0.062	0.078	0.073	0.088	0.104	0.126	0.173	0.206	0.237	0.268
0.034	0.042	0.044	0.060	0.048	0.063	0.079	0.101	0.148	0.182	0.212	0.243

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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