12 Point Cap Screw

Choose the high-quality China Xiaoguo® 12 point cap screw, which can still function effectively in a vibrating environment. It comes with a serrated flange surface. After being put into use, it generates strong anti-loosening friction force, eliminating the need for additional washers, and the installation efficiency is increased by 30%.

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Product Description

Comparison

Comparison between 12 point cap screw and hex bolt: In simple terms, the cap screw is a "enhanced version" specifically designed for specific high-performance requirements. Its core advantages lie in a smaller installation space, higher torque capacity, and stronger anti-loosening performance, but it also places higher demands on tools and budget. The following table will help you better understand the differences between the two types of screws.

Project	12 point cap screw	Hex bolt
Head design	Provide 12 contact points	The standard hexagon provides 6 contact points.
Operating space	Rotation only requires 30°.	Rotation requires 60°.
Tool Requirements	A special 12-point socket or star wrench must be used.	The tool has extremely high versatility and is applicable to almost all wrenches and sockets.
Torque transmission	Excellent	Average
Anti-loosening performance	Equipped with serrated flange, enhancing friction	Usually used in conjunction with spring washers
Surface pressure	Lower	Higher
Anti-slip thread performance	Excellent	Average
Installation efficiency	Installation speed is approximately 60% faster than that of hexagonal bolts.	Standard and universal
Cost	Higher	Lower
Applicable scenarios Harsh environments	automotive engines, aerospace, petrochemicals, heavy machinery, etc. Widely applied fields	general machinery, building structures, daily maintenance, etc.

12 Point Cap Screw

FAQ

（1）What standards do your 12 point cap screw meet?

A: We manufacture them strictly in accordance with DIN 34800 (German standard), ASME B18.2.5M (American metric standard) and IFI 115 (American flange-faced twelve-point bevel gear bolt).

（2）What materials do you offer?

A: We offer the following materials and performance grades:

Carbon steel、Alloy steel 、Stainless steel、Special materials: Titanium alloy, high-temperature alloys (such as Inconel 718), aluminum alloy, etc.

（3）What surface treatment options are available for 12 point cap screw? How resistant are they to salt spray?

12 Point Cap Screw

Mon	M22	M24	M27	M30	M33	M36	M39	M42	M45	M48	M52
P	2.5	3	3	3.5	3.5	4	4	4.5	4.5	5	5
dc max	33.3	38.1	38.1	42.8	47.5	52.3	57	61.7	66.5	76	76
dc min	32.68	37.48	37.48	42.18	46.88	51.56	56.26	60.96	65.76	75.26	75.26
ds max	22	24	27	30	33.0	36	39	42.0	45.0	48	52
ds min	21.79	23.79	26.79	29.79	32.75	35.75	38.75	41.75	44.75	47.75	51.7
e min	25.4	27.7	27.7	34.6	36.90	41.60	47.30	47.30	53.10	57.70	57.70
h max	6.9	7.98	7.98	9.21	9.62	10.82	12.71	12.56	15.65	16.1	16.1
h min	6.54	7.35	7.35	8.78	9.19	10.39	12.28	12.13	15.13	15.58	15.58
k max	22.36	25.56	25.56	28.96	32.0	35.2	38.3	41.4	44.7	51.03	51.03
k min	22.04	25.24	25.24	28.54	31.6	34.80	37.90	41.00	44.30	50.57	50.57
r max	1	1.2	1.20	1.4	1.60	1.60	1.80	1.80	2.00	2.20	2.20
r min	0.75	0.95	0.95	1.15	1.35	1.35	1.55	1.55	1.75	1.82	1.82
s max	22	24	24	30	32.00	36.00	41.00	41.00	46.0	50.0	50.0
s min	21.79	23.79	23.79	29.79	31.75	35.75	40.75	40.75	45.75	49.75	49.75

We offer:

Electro-galvanizing: Blue-white / Yellow zinc, resistant to salt spray for 48 - 120 hours

Zinc-nickel alloy: Silver-gray/black, resistant to salt fog for 500 - 1000 hours

Dakro/Geomet: Matte silver gray, resistant to salt spray for over 1000 hours

Hot-dip galvanizing: Silver-gray thick coating, resistant to salt spray for 500 - 1000 hours

Turning black: Takes only 12-24 hours

（4）What special tools are needed during installation?

A: A 12-point socket or a 12-point box wrench is required.

（5）Can your products be reused?

They can be reused provided that they are strictly inspected before each use to ensure there are no damages (no wear on the twelve-point head, no scratches on the threads, and no deformation on the flange surface). However, for 12.9 grade high-strength products, it is recommended not to exceed 3 uses.