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Square Head Bolt Din Standard

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DIN 7991 Flat Head Countersunk Socket

The difference between countersunk socket head screws and ordinary socket head screws is mainly reflected in the structure of the screw head.

Key words:

din 7991 flat head countersunk socket

Hexagon head bolts with fine pitch thread

Hexagon Socket Countersunk Head Screws

DIN 6334 Coupling Nut

DIN 985 Nylon Insert A2 A4 Stainless

DIN 965 Phillips Flat Head Machine Screw

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Bolt

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Description

DIN 7991 Specifications

All measurements in millimeters (mm)

d1	b	t	s	k max	d2
M3	12	1.2	2	1.7	6
M4	14	1.8	2.5	2.3	8
M5	16	2.3	3	2.8	10
M6	18	2.5	4	3.3	12
M8	22	3.5	5	4.4	16
M10	26	4.4	6	5.5	20
M12	30	4.6	8	6.5	24
M16	38	5.3	10	7.5	30
M20	46	5.9	12	8.5	36
M24	54	10.3	14	14	39

The difference between countersunk socket head screws and ordinary socket head screws is mainly reflected in the structure of the screw head. The screw head of the countersunk hexagon socket screw is conical. After installation, the screw head can be stuffed into the mounting surface to ensure the flatness of the mounting surface. The screw head of the ordinary hexagon socket screw is cylindrical. After installation, the screw head protrudes above the mounting surface. ‍

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FAQ

Who are we?

Handan Yongnian Hongda fastener Manufacturing Co., Ltd. is located in Yongnian, Handan of fasteners in my country, adjacent to the Beijing-Guangzhou Line, Jingjiu Expressway and Qinghong Expressway intersection, with convenient transportation.

How do we guarantee quality?

our factory successfully passed the ISO9001:2015 international quality system certification. In the future development, the company will continue to adhere to the quality policy of "continuous improvement, striving for excellence and innovation", cooperate wholeheartedly with customers and merchants with strong technical force, equipment force and economic strength, and go hand in hand to create brilliant new achievements.

What can you buy from us?

The company mainly produces bolts, nuts, anchor bolts, screws,stud bolts ,customized special-shaped parts, etc. The products can be produced according to the national international standard (ISO), German standard (DIN), American standard ( ANSI/ASME), British standard (BS) and Japanese standard (JIS).

Why do you want to buy from us instead of other suppliers?

It has more than 20 sets of advanced equipment and an annual output of more than 10,000 tons of high-quality products. The products are sold to more than a dozen countries in the Middle East, Europe, South Korea, and Southeast Asia. "Hongda products, high quality and good price" is the production tenet of our company.

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