DIN 7991 Machine Screws for Flush Mounting flat socket head cap screw
DIN 7991 Flat Countersunk Head Hexagon Socket Cap Screw
DIN 7991 Flat head hexagon socket screw size reference table
|
D |
D1 |
K |
S |
B |
|
3 |
6 |
1.7 |
2 |
12 |
|
4 |
8 |
2.3 |
2.5 |
14 |
|
5 |
10 |
2.8 |
3 |
16 |
|
6 |
12 |
3.3 |
4 |
18 |
|
8 |
16 |
4.4 |
5 |
22 |
|
10 |
4 |
6.5 |
8 |
26 |
|
12 |
24 |
6.5 |
8 |
30 |
|
14 |
27 |
7 |
10 |
34 |
|
16 |
30 |
7.5 |
10 |
38 |
|
20 |
36 |
8.5 |
12 |
46 |
|
24 |
39 |
14 |
14 |
54 |
Product Features
Countersunk head design
● The screw head sinks into the surface of the connected part, so that the installation surface remains flat and smooth, and does not protrude from the surface. It is not only beautiful, but also very important in some application scenarios that require a flat surface, such as the assembly of electronic equipment housings, the manufacture of precision instruments, etc., to avoid interference or influence on other components.
Hexagonal drive
● Compared with traditional external hexagonal or slotted, cross-slot screwdriver drive methods, the hexagonal design can provide greater torque transmission, making the screws more secure when tightened and not easy to loosen. At the same time, the hexagonal wrench and the screw head fit more tightly and are not easy to slip, which improves the convenience and efficiency of operation.
High-precision manufacturing
● Produced in accordance with DIN 7991 standards, with high dimensional accuracy, it allows the screws to fit well with nuts or other connectors, effectively ensuring the tightness and stability of the connection, and reducing problems such as loose connection or failure due to dimensional deviation.
DIN 7991 Weight reference for countersunk hexagon socket screws
|
D L (mm) |
3 |
4 |
5 |
6 |
8 |
10 |
|
Weight in kg(s) per 1000 pcs |
||||||
|
6 |
0.47 |
|
|
|
|
|
|
8 |
0.50 |
0.92 |
1.60 |
2.35 |
|
|
|
10 |
0.56 |
1.07 |
1.85 |
2.70 |
5.47 |
|
|
12 |
0.65 |
1.23 |
2.10 |
3.05 |
6.10 |
10.01 |
|
16 |
0.83 |
1.53 |
0.59 |
3.76 |
7.35 |
12.10 |
|
20 |
1.00 |
1.84 |
3.09 |
4.46 |
8.60 |
14.10 |
|
25 |
1.35 |
2.23 |
3.71 |
5.34 |
10.20 |
16.60 |
|
30 |
1.63 |
2.90 |
4.33 |
6.22 |
11.70 |
19.10 |
|
35 |
|
3.40 |
5.43 |
7.10 |
13.30 |
21.60 |
|
40 |
|
3.90 |
6.20 |
8.83 |
14.80 |
24.10 |
|
45 |
|
|
6.97 |
10.56 |
16.30 |
26.60 |
|
50 |
|
|
7.74 |
11.00 |
19.90 |
30.10 |
|
55 |
|
|
|
11.44 |
23.50 |
33.60 |
|
60 |
|
|
|
11.88 |
27.10 |
35.70 |
|
70 |
|
|
|
|
34.30 |
41.20 |
|
80 |
|
|
|
|
41.40 |
46.70 |
|
90 |
|
|
|
|
|
52.20 |
|
100 |
|
|
|
|
|
57.70 |
|
D L (mm) |
12 |
14 |
16 |
20 |
24 |
|
Weight in kg(s) per 1000 pcs |
|||||
|
20 |
21.2 |
|
|
|
|
|
25 |
24.8 |
|
|
|
|
|
30 |
28.5 |
|
51.8 |
|
|
|
35 |
32.1 |
|
58.4 |
91.4 |
|
|
40 |
35.7 |
|
65.1 |
102.0 |
|
|
45 |
39.3 |
|
71.6 |
111.6 |
|
|
50 |
43.0 |
|
78.4 |
123.0 |
179 |
|
55 |
46.7 |
|
85.0 |
133.4 |
194 |
|
60 |
54.0 |
|
91.7 |
143.0 |
209 |
|
70 |
62.9 |
|
111.0 |
164.0 |
239 |
|
80 |
71.8 |
|
127.0 |
200.0 |
269 |
|
90 |
80.7 |
|
143.0 |
226.0 |
299 |
|
100 |
89.6 |
|
159.0 |
253.0 |
365 |
|
110 |
98.5 |
|
175.0 |
279.0 |
431 |
|
120 |
107.4 |
|
191.0 |
305.0 |
497 |
In which industries can flat head socket cap screws be used?
Mechanical manufacturing: widely used in the manufacture and assembly of various mechanical equipment, such as machine tools, automobiles, engineering machinery, ships, etc., used to fix engine parts, transmission parts, body structural parts, mechanical transmission devices, etc., to ensure the overall structural strength and reliability of the equipment.
Electronic appliances: in electronic and electrical products, such as computers, televisions, mobile phones, communication equipment, etc., used to fix circuit boards, housings, radiators, power modules and other components, its good conductivity and anti-loosening performance can ensure the normal operation and safety of electronic equipment.
Building decoration: can be used for the installation of building doors and windows, the fixing of curtain walls, the manufacture of furniture, etc., its countersunk head design can make the installation surface more beautiful, while providing reliable connection, ensuring the firmness and stability of building decoration parts.
Medical equipment: due to the safety and corrosion resistance of its material, it is widely used in the field of medical equipment, such as the assembly of surgical instruments, the fixing of medical equipment, etc., which can meet the strict requirements of medical equipment for hygiene, safety and reliability.
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FAQ
Q: How to get a quote?
A: Our prices are determined by workmanship, materials and other market factors.
After your company contacts us with drawings and required material information, we will send you the latest quotation.
Q: What is the minimum order quantity?
A: The minimum order quantity for our small products is 100 pieces, while the minimum order number for large products is 10.
Q: How long do I have to wait for shipment after placing an order?
A: Samples can be supplied in approximately 7 days.
Mass-produced goods will ship within 35-40 days after receiving the deposit.
If our delivery schedule does not match your expectations, please voice an issue when inquiring. We will do everything we can to fulfill your requirements.
Q: What are the payment methods you accept?
A: We accept payments via bank account, Western Union, PayPal, and TT.
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