Cold heading Service

ASME B18.6.3 Square Slot Pan Head Self Tapping Screw

ASME B18.6.3 Square Slot Pan Head Self Tapping Screws combine a rounded pan head with a square-shaped drive recess for fastening applications that call for a distinct drive configuration. The pan head provides a broad bearing surface against the joined component, while the square recess accommodates a matching driver. Their tapping threads are designed to form mating threads during installation in suitable materials, making these screws suitable for sheet metal components, equipment housings, and general assembly work.

As an ISO 9001-certified company, we pay particular attention to the dimensional accuracy of square slot pan head self-tapping screws. Our production facilities use cold heading to form the pan head and square recess, followed by thread rolling to achieve the specified thread dimensions. During production, we focus on the consistency of the head profile, the width and depth of the square recess, and the accuracy of the thread. Material grades and heat treatment are controlled according to order specifications, with finished products checked against the applicable dimensional and mechanical requirements before shipment.

ASME B18.6.3 Square Slot Pan Head Self Tapping Screw Stainless Steel

ASME B18.6.3 Square Slot Pan Head Self Tapping Screw Zinc Plated

Specification:

Item	Specification
Standard	ASME B18.6.3
Product Type	Square Slot Pan Head Self Tapping Screw
Thread Diameter	#0-5/16"
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 Square Slot Pan 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 ASME B18.6.3 Square Slot Pan Head Self Tapping Screws affects their ability to withstand installation torque and form mating threads without premature failure.

SAE J933 – Carbon Steel Self-Tapping Screws

For carbon steel square slot pan head self-tapping screws, torsional strength is important when the tapping threads encounter resistance during installation. Suitable material selection and heat treatment help the screw withstand driving torque without fracturing. The pan head and square recess must also remain intact during tightening to support proper installation.

ISO 3506-4 – Stainless Steel Self-Tapping Screws

Stainless steel square slot pan head self-tapping screws are selected for applications requiring corrosion resistance alongside adequate fastening performance. Their mechanical properties depend on the stainless steel grade and applicable requirements. Torsional performance is particularly relevant during installation, when the screw must overcome thread-forming resistance while maintaining the integrity of the head and threaded section.

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