Phillips Pan Head

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Nominal Size or Basic Screw Diameter	Threads per Inch	D Major Diameter		d Minor Diameter		L These Lengths or Shorter Have AB Threads		Minimum Torsional strength, lb‑in. (STEEL SCREWS ONLY)
		Max	Min	Max	Min	50 Heads	Csk Heads
6 0.1380	18	0.141	0.136	0.102	0.096	1/4	5/16	24
7 0.1510	16	0.155	0.152	0.114	0.108	5/16	3/8	30
8 0.1640	15	0.168	0.162	0.123	0.116	3/8	7/16	39
10 0.1900	12	0.194	0.188	0.133	0.126	3/8	1/2	48
12 0.2160	11	0.221	0.215	0.162	0.155	7/16	9/16	83
14 0.2420	10	0.254	0.248	0.185	0.178	1/2	5/8	125
20 0.2780	9	0.333	0.327	0.226	0.226	11/16	13/16	250
24 0.3720	8	0.390	0.383	0.291	0.282	3/4	1	492
Tolerance on Length	—	Up to 1": ±0.03		Over1": ±0.05

Item	Content
Description	A thread forming tapping screw with wider spaced threads than a Type‑AB and a gimlet point
Applications/Advantages	For self starting in thin(.015‑.050 thick)metal or resin‑filled plywood.18‑8 Stainless steel tapping screws may be used in applications which require general atmospheric corrosion resistance.Fastening stainless steel parts to aluminum or steel can cause a type of corrosion known as a galvanic couple in some environments.
Material	Steel: AISI 1016‑1024 or equivalent steel. Stainless: Austenitic 18‑8 stainless steel
Heat Treatment (Steel only)	Screws shall be quenched in liquid and then tempered by reheating to 650°F minimum.
Surface Hardness	Steel: Rockwell C45 minimum
Case Depth (Steel only)	No.6 diameter: .002‑.007 No.8 thru 12 diameter: .004‑.009 1/4"and larger: .005‑.011
Core Hardness (after tempering)	Steel: Rockwell C28‑38
Plating	See Appendix‑A for information on plating of steel screws.

Nominal Size or Basic Screw Diameter	Threads Per Inch	D Major Diameter		d Minor Diameter		L Minimum Practical Screw Length		Minimum Torsional strength, lb‑in. (STEEL SCREWS ONLY)
		Max	Min	Max	Min	500 Heads	Csk head s
2 0.0860	32	0.088	0.082	0.064	0.060	3/16	7/32	4
3 0.0990	28	0.101	0.095	0.075	0.071	3/16	9/32	9
4 0.1120	24	0.114	0.108	0.088	0.082	7/32	5/16	13
5 0.1250	20	0.127	0.123	0.094	0.090	1/4	11/32	18
6 0.1380	20	0.139	0.132	0.104	0.099	9/32	3/8	24
7 0.1510	19	0.154	0.147	0.115	0.109	5/16	3/8	30
8 0.1640	18	0.166	0.159	0.122	0.116	5/16	13/32	39
10 0.1900	16	0.189	0.182	0.141	0.135	3/8	7/16	56
12 0.2160	14	0.215	0.208	0.164	0.157	7/16	21/32	88
14 0.2500	14	0.246	0.237	0.192	0.185	1/2	13/16	142
5/16 0.3125	12	0.315	0.306	0.244	0.236	5/8	29/32	290
3/8 0.3750	12	0.380	0.371	0.309	0.299	3/4	31/32	590
Tolerance on Length	—	Up to 1": ±0.03		Over1": ±0.05

Item	Content
Description	A thread forming tapping screw with spaced threads and a gimlet point
Applications/Advantages	For self starting in thin metal or resin‑filled plywood. Recommended over a Type‑A,‑particularly in brittle materials.
Material	Steel: AISI 1016‑1024 or equivalent steel. Stainless:18‑8 stainless steel.
Heat Treatment (Steel only)	Screws shall be quenched in liquid and then tempered by reheating to 650°F minimum.
Surface Hardness	Steel: Rockwell C45 minimum
Case Depth (Steel only)	No.4 thru 6 diameter: .002‑.007 No.8 thru 12 diameter: .004‑.009 1/4"and larger: .005‑.011
Core Hardness (after tempering)	Steel: Rockwell C28‑38
Plating	See Appendix‑A for plating information.

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What are the application scenarios?

Magnesium-aluminum alloy nuts used in new energy vehicle battery boxes, reducing weight by 40%. Titanium alloy bolts applied in high-end vehicle engines, resistant to high temperature and pressure.

How is the product performance?

Self-drilling screws: Corrosion resistance improved by 3 times (e.g., through aluminum-zinc coating process), suitable for humid environments.

What are the technical parameters and materials of the product?

Materials: Carbon steel, stainless steel, aluminum alloy, etc., with varying corrosion resistance and strength.

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Production process, enterprise production capability？

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