Cold heading Service

ASME B18.6.3 Cross Recessed Truss Head Self Tapping Screw

ASME B18.6.3 Cross Recessed Truss Head Self Tapping Screws feature a low-profile head with a wide bearing surface, making them suitable for fastening applications where broader coverage around the screw hole is desirable. The cross recess accommodates a matching driver, while the self-tapping thread forms a mating thread during installation in suitable materials. This combination is useful for securing thin sheet metal, brackets, and lightweight components where a wide head profile helps cover the mounting hole.

Producing truss head self-tapping screws requires consistent control of the head diameter, head height, and cross recess geometry. Our production facilities use cold heading to form the head and cross recess, followed by thread rolling to achieve the specified thread dimensions. We also check material grades against order requirements and control heat treatment according to the required mechanical properties. As an ISO 9001-certified company, we coordinate dimensional and quality inspections with our production partners to ensure that finished screws meet the specified requirements for head geometry, thread accuracy, and surface finish.

ASME B18.6.3 Cross Recessed Truss Head Self Tapping Screw Stainless Steel

Specification:

Item	Specification
Standard	ASME B18.6.3
Product Type	Cross Recessed Truss Head Self Tapping Screw
Thread Diameter	#0-1/2"
Point Type	Type AB Pointed Tip
Material	Carbon Steel, Stainless Steel
Steel Property	SAE J933
Stainless Steel Property	ISO 3506-4
Surface Treatment	Black Oxidation,Zinc Plated,Bright Finish
Inspection	Dimensions,Thread,Hardness,Coating

Dimension Chart:

Drawing of ASME B18.6.3 Cross Recessed Truss Head Self Tapping Screw

Mon	#0	#1	#2	#3	#4	#5	#6	#7	#8	#10	#12	1/4	5/16	3/8	7/16	1/2
P	48	42	32	28	24	20	20	19	18	16	14	14	12	12	10	10
dk max	0.131	0.164	0.194	0.226	0.27	0.289	0.321	0.352	0.384	0.448	0.511	0.573	0.698	0.823	0.948	1.073
dk min	0.119	0.149	0.18	0.211	0.241	0.272	0.303	0.333	0.364	0.425	0.487	0.546	0.666	0.787	0.907	1.028
k max	0.037	0.045	0.053	0.061	0.069	0.078	0.086	0.094	0.102	0.118	0.134	0.15	0.183	0.215	0.248	0.28
k min	0.029	0.037	0.044	0.051	0.059	0.066	0.074	0.081	0.088	0.103	0.118	0.133	0.162	0.191	0.221	0.25
M	0.056	0.064	0.097	0.103	0.105	0.121	0.151	0.158	0.166	0.181	0.241	0.256	0.345	0.376	0.407	0.437
No.	0	0	1	1	1	1	2	2	2	2	3	3	4	4	4	4
t max	0.03	0.038	0.052	0.059	0.062	0.078	0.073	0.08	0.088	0.104	0.111	0.126	0.173	0.206	0.237	0.268
t min	0.012	0.02	0.034	0.042	0.044	0.06	0.048	0.055	0.063	0.079	0.086	0.101	0.148	0.182	0.212	0.243
d max	0.06	0.075	0.088	0.101	0.114	0.13	0.139	0.154	0.166	0.189	0.215	0.246	0.315	0.38	0.44	0.504
d min	0.054	0.069	0.082	0.095	0.108	0.123	0.132	0.147	0.159	0.182	0.208	0.237	0.306	0.371	0.429	0.493
d1 max	0.036	0.049	0.064	0.075	0.086	0.094	0.104	0.115	0.122	0.141	0.164	0.192	0.244	0.309	0.359	0.423
d1 min	0.033	0.046	0.06	0.071	0.082	0.09	0.099	0.109	0.116	0.135	0.157	0.185	0.236	0.299	0.349	0.413

Mechanical Property:

The mechanical performance of cross recessed truss head self-tapping screws depends on their torsional strength and ability to withstand installation without screw breakage or damage to the drive recess. The wide truss head provides a broad bearing surface, while the cross recess allows installation with a matching Phillips driver.

Carbon Steel – SAE J933

SAE J933 specifies mechanical requirements for carbon steel self-tapping screws, including torsional strength. These requirements help ensure that the screws can withstand the torque applied during installation. Relevant requirements depend on the screw size and applicable specification.

Stainless Steel – ISO 3506-4

ISO 3506-4 covers mechanical and physical properties for applicable stainless steel self-tapping screws. The specified stainless steel grade and its mechanical properties should be considered alongside the dimensional requirements of ASME B18.6.3.

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