12-Point Flange Head Cap Screws

AYA Fasteners (Hebei) Co., Ltd. is one of the most experienced manufacturers and suppliers of 12-point flange head cap screws in China. Please feel free to buy high quality 12-point flange head cap screws made in China here from our factory. For price consultation, contact us.

 

 

As a global supplier of customized fastening solutions, AYA's service process is also as close to customers as AYA's products. From describing needs to follow-up services, AYA will promptly and spare no effort to help customers solve any fastening problems that arise and eliminate customers' concerns.

 

 

Standard	ISO 9254
Thread Type	Long MJ Thread
Commodity	12-Point Flange Head Cap Screws
Also Named	12pt Flange Bolt
Material	Carbon Steel
Diameter	MJ4, MJ5, MJ6, MJ7, MJ8, MJ10, MJ12
Finish	Plain/ Black Oxide/ Zinc Plated/ Hot Dipped Galvanized/ Organic/ Dacromet/ Phosphating/ Cadmium Electroplate/ Nickel Plated
Head Type	12-Point Head
MOQ	1000kgs
Lead Time	30 to 60 days

 

 

Code			MJ4	MJ5	MJ6	MJ7	MJ8	MJ10	MJ12
P	Pitch		0.7	0.8	1	1	1	1.25	1.25
ds	max		4	5	6	7	8	10	12
	min		3.88	4.88	5.88	6.85	7.85	9.85	11.82
d2	max		-	3.7	4.6	5.4	5.7	7.2	8.5
	min		-	3.2	4.1	4.9	5.2	6.7	8
dk	min		6	7	8	9	10	12	14
dc	max		8.3	9.1	10.6	12.1	13.6	16.7	19.9
d1	max		1.14	1.14	1.54	1.54	1.54	1.74	1.74
	min		1	1	1.4	1.4	1.4	1.6	1.6
c	min		0.8	1	1.2	1.4	1.6	2	2.4
k	max		5.5	6.5	7.5	8.2	8.6	10.1	11.4
	min		5.02	5.92	6.92	7.62	8.02	9.4	10.7
b			14	16	18	20	22	26	30
L	tol (±0.3)		16 ~ 56	20 ~ 70	22 ~ 84	24 ~ 98	26 ~ 112	32 ~ 140	36 ~ 168
L1			3.5	4.5	5.2	5.9	6.3	7.7	8.8
w	max		-	2.9	3.2	3.7	4.1	5.1	6
	min		-	2.5	2.8	3.3	3.7	4.7	5.6

 

 

 

 

 

Compared to standard hex bolts, the 12-point design offers a higher torque-to-weight ratio and a smaller head diameter, making it the ideal choice for compact, high-stress environments such as automotive powertrains, racing engines, and heavy industrial pumps.

 

When standard off-the-shelf fasteners fail to meet your precise clearance, fatigue life, or tensile strength requirements, AYA Fasteners provides custom-engineered solutions tailored exactly to your blueprints.

 

 

Our Custom Manufacturing Scope for 12-Point Bolts:

 

• Advanced Material Selection: Beyond standard carbon steel, we specialize in high-tensile Alloy Steel (Grade 10.9, 12.9), Stainless Steel (A2, A4), Superalloys, and Titanium for high-temperature or corrosive environments.
• Precision Thread & Flange Modifications: Custom flange diameters, under-head serrations for anti-loosening, and optimized thread pitches to distribute load evenly.
• Strict Tight Tolerance Control: Engineered for zero-defect automated assembly lines, ensuring critical dimensions match your CAD files perfectly.
• High-End Surface Treatment: Customized coatings including Zinc Flake, Cadmium plating, or Black Oxide to control friction coefficients and prevent hydrogen embrittlement.

 

Submit CAD Drawings for Technical Review

 

 

1. The 12-Point Flange Head Cap Screws are made of carbon steel that has been zinc plated for increased rust resistance.

2. Compared to a socket head or hex head screw, the head makes 12 points of contact with a wrench to manage more torque.

3. The flange eliminates the need for a separate washer by distributing pressure where the screw touches the surface.

4. Higher torque capability compared to a socket head cap screw.

5. As 12-point screws often have smaller heads than hex screws, they are often used in situations where installation space is tight and saving weight is critical.

 

 

 

All production procedures will be supervised by QC inspectors to ensure that the final products are able to meet customers' expectations.

 

 

 

Automated packing lines improve the quality and speed of the packaging work.

AYA's design team can meet customers' unique needs for labels.

 

 

 

 

 

AYA provides exclusive services to 1000+ members from all over the world every year, with a unique chain service solution system, you only need to click the mouse to get exclusive fastening solution and enjoy door-to-door services.

 

 

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