AYA FASTENERS Guide | Why 12-Point Cap Screws Better Than Hex Head Cap Screws?

The 12-point cap screw is designed to replace hex socket head cap screws. And so, the screw is better in several aspects and proves to be a perfect fit for a tighter assembly. Why is it better than hex head cap screws? What are its applications? This article will explain the characteristics and advantages of a 12-point cap screw.

Description of 12-Point Cap Screw EMAIL: SALES@AYAFASTENERS.COM

While the counterbored holes are similar to the design of standard hex socket cap screws, the diameter and head height are designed to fit applications. The 12-Point Cap Screw head is often tightened with standard 12-Point socket wrenches. These screws are also known as ferry cap screws.

12-Point Cap Screws Dimensions Tables(ASME B 18.2.5M) EMAIL: SALES@AYAFASTENERS.COM

12-POINT CAP SCREW-2D

Thread Size		M5	M6	M8	M10	M12	M14	M16	M20	M24	M30	M36
d		M5	M6	M8	M10	M12	M14	M16	M20	M24	M30	M36
P	Pitch	0.8	1	1.25	1.5	1.75	2	2	2.5	3	3.5	4
d_s	max	5	6	8	10	12	14	16	20	24	30	36
d_s	min	4.82	5.82	7.78	9.78	11.73	13.73	15.73	19.67	23.67	29.67	35.61
s	Nominal Size	5	6	8	10	12	14	16	20	24	30	36
	max	5	6	8	10	12	14	16	20	24	30	36
	min	4.79	5.79	7.78	9.78	11.79	13.79	15.81	19.82	23.75	29.72	35.7
d_k	min	5.6	6.7	9	11.2	13.5	15.8	18	22.5	27	33.8	40.5
d_c	max	8.72	10.22	13.27	16.27	18.27	21.33	24.33	30.33	36.39	45.39	54.46
d_c	min	8.27	9.77	12.72	15.69	17.67	20.67	23.62	29.55	35.52	44.52	52.75
c	max	2.25	2.7	3.6	4.5	5.4	6.3	7.2	9	10.8	13.5	16.2
c	min	2	2.45	3.35	4.13	5.03	5.93	6.83	8.5	10.3	13	15.6
k	max	5	6	8	10	12	14	16	20	24	30	36
k	min	4.88	5.82	7.78	9.78	11.73	13.73	15.73	19.67	23.67	29.67	35.57
b	L≤125	16	18	22	26	30	34	38	46	54	66	-
	125＜L≤200	22	24	28	32	36	40	44	52	60	72	84
	L＞200	35	37	41	45	49	53	57	65	73	85	97
d_w	min	8.03	9.38	12.33	15.33	17.23	20.17	23.17	28.87	34.81	43.61	52.54
k_w	min	2.63	3.12	4.18	5.28	6.33	7.43	8.53	10.67	12.87	16.17	19.37

①, Material and mechanical properties
ⓐUnless otherwise specified, steel screws shall conform to the requirements of ISO 898-1, Property Class 12.9
ⓑUnless otherwise specified, corrosion-resistant steel screws shall conform to the requirements of ISO 3506-1 for the specified property class
ⓒUnless otherwise specified, nonferrous screws shall conform to the requirements of ASTM F468M or the specified property alloy

Main features of 12-Point Cap Screw EMAIL: SALES@AYAFASTENERS.COM

While the 12-point cap screw retains most features of a hex head cap screw, the wrenching surface is where the difference is. It is often smaller in size, and the top of the head is designed in a way to make it easier to be wrenched with a 12-point wrench. So, it works as a better option. As for the features, the head of the screw has twelve points as the overlap of two hexagons and has a flanged underside. They can come in different sizes and grades based on the requirements. The steel grades of the 12-point cap screw are high and better in quality, which results in high corrosion resistance and strength of the screw.

Advantages of 12-Point Cap Screw EMAIL: SALES@AYAFASTENERS.COM

The 12-point cap screw is more durable, flexible, and reusable. It is also easy to install and creates a more secure assembly during installation. Compared to standard hex screws, which result in rounding the hex socket, the 12-Point Cap Screw permits greater torque to be applied to the bolt and eliminates the rounding.

A significant advantage of the 12-Point Cap Screw is that its flange diameter and head thickness is equivalent to the diameter and thickness of the socket head cap screw. This means that the 12-Point Cap Screw can be used easily as a replacement in any application that is currently using a socket head cap screw. Besides these, the higher strength and the larger bearing area under the head of the 12-Point Cap Screw help provide additional benefits for assemblies. To top it all, these screws are also more aesthetically pleasing.

12-POINT CAP SCREW-advantage

Applications of 12-Point Cap Screw EMAIL: SALES@AYAFASTENERS.COM

The 12-point cap screw is basically used for insertion in pre-tapped holes or use with nuts. They are used in applications where the screw has to be driven hard and tight. Because of its recessing head, it is commonly used in the oil and gas industry. They are also very prevalent in engine applications, especially for clamp load. The clamp load for engine applications is higher, and the 12-point cap screw and bolt are considered the best to deliver. Additionally, the 12-point cap screw and similar varieties are used in the petroleum, petrochemical, and automotive industries. They are known to be best companions for high vibration, high temperature, and high-pressure systems.

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