DIN 6797 (J):1988 Internal Tooth Lock Washer has teeth around the inner hole and is suitable for joints with small screw heads or limited outer clearance. After tightening, the internal teeth bite into the contact surface and help improve resistance to loosening.
The product can be used in electrical components, instrument assembly, small machinery, terminal connections, and thin-sheet fixing. The internal-tooth design usually has less visual impact on the outside edge, making it suitable where a clean outer appearance or small-head fastener compatibility is required.
Material and surface treatment can be chosen according to thread size, conductivity requirement, and working environment, supporting stable contact while meeting rust-protection and maintenance needs.

Dimensions unit: mm
|
Specification |
2.2 |
2.7 |
3.2 |
3.7 |
4.3 |
5.3 |
6.4 |
7.4 |
8.4 |
10.5 |
||
|
d |
Min.=Nominal |
2.2 |
2.7 |
3.2 |
3.7 |
4.3 |
5.3 |
6.4 |
7.4 |
8.4 |
10.5 |
|
|
Max. |
2.34 |
2.84 |
3.38 |
3.88 |
4.48 |
5.48 |
6.62 |
7.62 |
8.62 |
10.77 |
||
|
dc |
Max.=Nominal |
4.5 |
5.5 |
6 |
7 |
8 |
10 |
11 |
12.5 |
15 |
18 |
|
|
Min. |
4.2 |
5.2 |
5.7 |
6.64 |
7.64 |
9.64 |
10.57 |
12.07 |
14.57 |
17.57 |
||
|
t |
0.3 |
0.4 |
0.4 |
0.5 |
0.5 |
0.6 |
0.7 |
0.8 |
0.8 |
0.9 |
||
|
Number of teeth |
6 |
6 |
6 |
6 |
8 |
8 |
8 |
8 |
8 |
9 |
||
|
Weight per thousand pieces kg |
0.04 |
0.045 |
0.045 |
0.085 |
0.1 |
0.2 |
0.25 |
0.35 |
0.55 |
0.9 |
||
|
Applicable thread |
M2 |
M2.5 |
M3 |
M3.5 |
M4 |
M5 |
M6 |
M7 |
M8 |
M10 |
||
|
Specification |
13 |
15 |
17 |
19 |
21 |
23 |
25 |
28 |
31 |
||
|
d |
Min.=Nominal |
13 |
15 |
17 |
19 |
21 |
23 |
25 |
28 |
31 |
|
|
Max. |
13.27 |
15.27 |
17.27 |
19.33 |
21.33 |
23.33 |
25.33 |
28.33 |
31.39 |
||
|
dc |
Max.=Nominal |
20.5 |
24 |
26 |
30 |
33 |
36 |
38 |
44 |
48 |
|
|
Min. |
19.98 |
23.48 |
25.48 |
29.48 |
32.38 |
35.38 |
37.38 |
43.38 |
47.38 |
||
|
t |
1 |
1 |
1.2 |
1.4 |
1.4 |
1.5 |
1.5 |
1.6 |
1.6 |
||
|
Number of teeth |
10 |
10 |
12 |
12 |
12 |
14 |
14 |
14 |
14 |
||
|
Weight per thousand pieces kg |
1.2 |
1.9 |
2.4 |
3.7 |
4.1 |
6 |
6.5 |
8.5 |
9.5 |
||
|
Applicable thread |
M12 |
M14 |
M16 |
M18 |
M20 |
M22 |
M24 |
M27 |
M30 |
||
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 6797 (J):1988 Internal Tooth J Washer 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 6797 (J):1988 Internal Tooth J Washer 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 6797 (J):1988 Internal Tooth J Washer 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