DIN 34821:2005 Socket Head Cap Internal 12-Point Drive Screw features an internal 12-point drive, offering multiple contact points for precise tool positioning and controlled torque transmission in restricted assembly spaces.
The cylindrical head provides a neat appearance on equipment surfaces, while the internal drive reduces external clearance requirements. The multi-point drive form also helps distribute tool load and reduce localized recess deformation.
This screw is suitable for industrial equipment, special-purpose machinery, aerospace-related components, power transmission assemblies, molds, and demanding fixtures. Material grade, strength class, and surface protection can be selected to balance load capacity with long-term serviceability.

Dimensions unit: inch
|
Thread size d |
M6 |
M8 |
M10 |
M12 |
M14 |
M16 |
||
|
P |
Pitch |
Coarse teeth |
1 |
1.25 |
1.5 |
1.75 |
2 |
2 |
|
Fine Teeth |
- |
- |
- |
1.5 |
1.5 |
1.5 |
||
|
da |
Max. |
6.8 |
9.2 |
11.2 |
13.7 |
15.7 |
17.7 |
|
|
dk |
Max. |
10 |
13 |
16 |
18 |
21 |
24 |
|
|
Min. |
9.78 |
12.73 |
15.73 |
17.73 |
20.67 |
23.67 |
||
|
dw |
Min. |
9.38 |
12.33 |
15.33 |
17.23 |
20.17 |
23.17 |
|
|
h |
Max. |
4.2 |
5.48 |
6.78 |
8.08 |
9.48 |
10.58 |
|
|
k |
Max.=Nominal |
6 |
8 |
10 |
12 |
14 |
16 |
|
|
Min. |
5.7 |
7.64 |
9.64 |
11.57 |
13.57 |
15.57 |
||
|
r |
Min. |
0.25 |
0.4 |
0.4 |
0.6 |
0.6 |
0.6 |
|
|
Slot number |
N8 |
N10 |
N12 |
N14 |
N16 |
N18 |
||
|
C |
7.4 |
9.84 |
11.7 |
13.54 |
15.99 |
17.18 |
||
|
t |
Max. |
3.4 |
4.48 |
5.48 |
6.48 |
7.58 |
8.58 |
|
|
Min. |
3 |
4 |
5 |
6 |
7 |
8 |
||
|
V |
Max. |
0.6 |
0.8 |
1 |
1.2 |
1.4 |
1.6 |
|
|
Thousand pieces of steel weigh ≈kg |
- |
- |
- |
- |
- |
- |
||
FAQ
A: We take every inquiry seriously. On working days, we will respond within 12 hours after receiving your inquiry.
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 34821:2005 Socket Head Cap Internal 12-Point Drive Screw Factory. We own several fastener manufacturing facilities and have an international sales department, providing full-process services from production to export.
A: Customized production is our core business. We can develop and manufacture products based on the drawings or samples you provide.
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 34821:2005 Socket Head Cap Internal 12-Point Drive Screw Wholesale.
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.
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.
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.
About Us
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 34821:2005 Socket Head Cap Internal 12-Point Drive 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 deliveryNEWS