Wholesale DIN 7991:1986 Countersunk Head Hex Socket Screw

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DIN 7991:1986 Countersunk Head Hex Socket Screw

DIN 7991:1986 Countersunk Head Hex Socket Screw combines a hex socket drive with a countersunk head, making it suitable for fastening points that require reliable clamping, removable maintenance, and standardized assembly. The DIN standard background helps keep dimensional requirements clear across drawings, purchasing, and quality inspection, supporting smooth alignment between engineering drawings, purchasing lists, and quality inspection.

From an assembly perspective, the internal hex socket provides deeper tool engagement, enabling higher assembly torque in compact spaces while reducing external head interference. At the same time, the tapered head seats into a prepared countersink, allowing the screw to sit flush or nearly flush with the surface, so the screw can provide stable fastening performance across different sheet thicknesses, appearance requirements, and space limitations.

It works well on flat surfaces, rails, covers, module housings, and areas where snagging or interference should be avoided. For batch assembly, the product can be tailored around workstation tools, tightening torque, visual grade, and packaging method to reduce sorting cost and improve assembly consistency.

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Dimensions unit: mm

Thread size d

M3

M4

M5

M6

M8

M10

M12

(M14)

M16

(M18)

M20

(M22)

M24

P

Pitch

0.5

0.7

0.8

1

1.25

1.5

1.75

2

2

2.5

2.5

2.5

3

α

tol.(+2)

90°

90°

90°

90°

90°

90°

90°

90°

90°

90°

90°

60°

60°

b

L≤125

12

14

16

18

22

26

30

34

38

42

46

50

54

125<L ≤ 200

/

/

/

24

28

32

36

40

44

48

52

56

60

L>200

/

/

/

/

/

45

49

53

57

61

65

69

73

dk

Max.= Nominal

6

8

10

12

16

20

24

27

30

33

36

36

39

Min.

5.7

7.64

9.64

11.57

15.57

19.48

23.48

26.48

29.48

32.38

35.38

35.38

38.38

ds

Max.=Nominal

3

4

5

6

8

10

12

14

16

18

20

22

24

Min.

2.86

3.82

4.82

5.82

7.78

9.78

11.73

13.73

15.73

17.73

19.67

21.67

23.67

e

Min.

2.3

2.87

3.44

4.58

5.72

6.86

9.15

11.43

11.43

13.72

13.72

16

16

k

Max.

1.7

2.3

2.8

3.3

4.4

5.5

6.5

7

7.5

8

8.5

13.1

14

s

Nominal

2

2.5

3

4

5

6

8

10

10

12

12

14

14

Min.

2.02

2.52

3.02

4.02

5.02

6.02

8.025

10.025

10.025

12.032

12.032

14.032

14.032

Max.

2.1

2.6

3.1

4.12

5.14

6.14

8.175

10.175

10.175

12.212

12.212

14.212

14.212

t

Max.=Nominal

1.2

1.8

2.3

2.5

3.5

4.4

4.6

4.8

5.3

5.5

5.9

8.8

10.3

Min.

0.95

1.55

2.05

2.25

3.2

4.1

4.3

4.5

5

5.2

5.6

8.44

9.87

Thousand pieces of steel weigh ≈kg 

-

-

-

-

-

-

-

-

-

-

-

-

-

Thread length b 

-

-

-

-

-

-

-

-

-

-

-

-

-

FAQ

Frequently Asked Questions

  • 1. How soon can I expect a reply after sending an inquiry?

    A: We take every inquiry seriously. On working days, we will respond within 12 hours after receiving your inquiry.

  • 2. What products do you mainly offer?

    A: We focus on the production of fasteners made of carbon steel, stainless steel, and low-alloy steel. We are a direct manufacturer with independent production capacity. DIN 7991:1986 Countersunk Head Hex Socket Screw Factory. We own several fastener manufacturing facilities and have an international sales department, providing full-process services from production to export.

  • 3. Do you support customized production?

    A: Customized production is our core business. We can develop and manufacture products based on the drawings or samples you provide.

  • 4. Do you produce standard parts?

    A: Yes. In addition to custom products, we also produce general construction machinery parts (GET parts) for equipment such as excavators, including bucket teeth, tooth holders, corner blades, pins, clips, bolts and nuts. DIN 7991:1986 Countersunk Head Hex Socket Screw Wholesale.

  • 5. What is your production capacity?

    A: We have 12 energy-efficient and environmentally friendly modern production lines (including one fully automatic shell molding line and four heat treatment lines), with an annual production capacity exceeding 20,000 tons, enabling us to steadily meet various order requirements.

  • 6. What are your payment terms?

    A: Trade terms (such as FOB, CIF, etc.) are confirmed when quoting. For batch production, we typically require a 30% deposit, with the balance paid against the copy of the bill of lading. T/T is the main payment method accepted, and L/C can also be negotiated.

  • 7. How is the shipment arranged?

    A: We are only 35 km away from Shanghai Port and Ningbo Port, so sea freight is the main mode of transportation, which is convenient and efficient. For urgent deliveries, we can also arrange air freight via Ningbo or Shanghai airports.

Better Fastener Industry Co., Ltd.

About Us

BETTER FASTENER INDUSTRY CO., LTD.

Better Fastener is a professional fastener enterprise specializing in the manufacturing of steel washers, stainless steel washers, spring washers and sealingwashers. Founded in 2001 as a washer factory, the company expanded into a comprehensive enterprise integrating washers, nuts, bolts, spring nuts and other fastener products in 2010. DIN 7991:1986 Countersunk Head Hex Socket Screw Suppliers in China.

The company positions itself as a provider of comprehensive one-stop services for customers, relying on technological R&D, industrial investment and trade distribution.

With an experienced professional team and a sound sales network, Better Fastener has achieved excellent sales performance in both domestic and foreign markets,and has grown into one of the competitive manufacturers and suppliers in China's industrial fastener industry.

Better Fastener is committed to becoming a trusted fastener supplier for customers with reliable product quality, reasonable prices and on-time delivery

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