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Hexagon Socket Flat Countersunk Head Cap Screws

As one of professional high quality Hexagon Socket Flat Countersunk Head Cap Screws manufacturers, you can rest assured to buy Hexagon Socket Flat Countersunk Head Cap Screws from DONGSHAO and we will offer you the best after-sale service and timely deliver

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Product Description

Hebei Dongshao Fastener Manufacturing Co., Ltd. is a well-known supplier and manufacturer of Hexagon socket flat countersunk head cap screws in China.

Our hexagon socket flat countersunk head cap screws are manufactured in full compliance with international standards, including DIN 7991, ANSI/ASME B18.3.5M, and ASTM F835, ensuring compatibility with global engineering requirements.

Material & Performance

The hexagon socket flat countersunk head cap screws are made of high-quality alloy steel (SCM435 equivalent) with fine grain practice, offering excellent strength and durability.

The screws undergo quenching and tempering heat treatment, achieving a hardness of thirty-two to thirty-nine HRC and strength classification equivalent to ten point nine grade.

With corrosion resistance, high strength, and resistance to breakage, these screws ensure reliable product quality.

Surface Treatment

The screw surface treatment technology is excellent.

Various surface treatment methods are available including:

Zinc plating / Trivalent Chromate – enhanced corrosion resistance with a smooth, attractive finish.

Black oxide – provides a sleek black appearance with good rust prevention.

Customized surface treatments available upon request.

Dimensional Accuracy

The size of the hexagon socket flat countersunk head cap screws is precise, with high cutting precision of the hexagon socket.

This ensures the screws are more stable and reliable in use.

Versatile Applications

The products are widely used in various fields including:

Bicycles – frame and component assembly.

Machinery – industrial equipment and precision mechanisms.

Automotive – vehicle assembly and components.

Construction – structural applications.

Rail transit – railway and infrastructure projects.

Photovoltaic solar – solar panel mounting systems.

Hexagon socket flat countersunk head cap screws are installed with a universal hexagon wrench, facilitating easy loading and unloading.

The flat countersunk head design is particularly suitable for countersunk holes in hinges, mechanical assemblies, and applications requiring a smooth surface finish.

Product Parameter

(mm)	M3	M4	M5	M6	M8	M10	M12	M14	M16	M20
P	0.5	0.7	0.8	1	1.25	1.5	1.75	2	2	2.5
dk max	6.72	8.96	11.21	13.44	17.92	22.4	26.88	30.8	33.6	40.32
dk min	5.54	7.53	9.43	11.34	15.24	19.22	23.12	26.52	29.01	36.05
e min	2.303	2.873	3.443	4.583	5.723	6.863	9.149	11.429	11.429	13.716
k max	1.86	2.48	3.1	3.72	4.95	6.2	7.44	8.4	8.8	10.16
s max	2.08	2.58	3.08	4.095	5.14	6.14	8.175	10.175	10.175	12.212
s min	2.02	2.52	3.02	4.02	5.02	6.02	8.025	10.025	10.025	12.032
t min	1.1	1.5	1.9	2.2	3	3.6	4.3	4.5	4.8	5.6