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Metric Internal-Tooth Lock Washers
Internal teeth dig into the screw head while the smooth outside edge won't snag objects. These washers provide greater vibration resistance than split lock washers. Use with fasteners that have small heads, such as fillister and cheese head screws.
Black-oxide steel washers are mildly corrosion resistant in dry environments.
Zinc-plated steel washers resist corrosion in wet environments.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
| For Screw Size  | ID, mm | OD, mm | Thick., mm | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Black-Oxide Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| M2 | 2.2 | 4.5 | 0.2-0.4 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 00000 |
| M2.5 | 2.7 | 5.5 | 0.2-0.5 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 0000 |
| M2.6 | 2.8 | 5.5 | 0.3-0.5 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 0000 |
| M3 | 3.2 | 6.0 | 0.3-0.5 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 0000 |
| M3.5 | 3.7 | 7.0 | 0.4-0.6 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 0000 |
| M4 | 4.3 | 8.0 | 0.4-0.6 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 0000 |
| M5 | 5.3 | 10.0 | 0.5-0.7 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 0000 |
| M6 | 6.4 | 11.0 | 0.6-0.8 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 0000 |
| M8 | 8.4 | 15.0 | 0.7-0.9 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 0000 |
| M10 | 10.5 | 18.0 | 0.8-1.0 | Rockwell C35 | DIN 6797 | 50 | 000000000 | 0000 |
| M12 | 13.0 | 20.5 | 0.9-1.2 | Rockwell C35 | DIN 6797 | 50 | 000000000 | 0000 |
| M14 | 15.0 | 24.0 | 0.9-1.2 | Rockwell C35 | DIN 6797 | 25 | 000000000 | 0000 |
| M16 | 17.0 | 26.0 | 1.0-1.4 | Rockwell C35 | DIN 6797 | 25 | 000000000 | 0000 |
| M18 | 19.0 | 30.0 | 1.2-1.5 | Rockwell C35 | DIN 6797 | 10 | 000000000 | 0000 |
| M20 | 21.0 | 33.0 | 1.2-1.5 | Rockwell C35 | DIN 6797 | 10 | 000000000 | 00000 |
Zinc-Plated Steel | ||||||||
| M2 | 2.2 | 4.5 | 0.2-0.4 | Rockwell C42 | DIN 6797 | 100 | 000000000 | 0000 |
| M2.5 | 2.7 | 5.5 | 0.2-0.5 | Rockwell C42 | DIN 6797 | 100 | 000000000 | 0000 |
| M3 | 3.2 | 6.0 | 0.3-0.5 | Rockwell C42 | DIN 6797 | 100 | 000000000 | 0000 |
| M3.5 | 3.7 | 7.0 | 0.4-0.6 | Rockwell C42 | DIN 6797 | 100 | 000000000 | 0000 |
| M4 | 4.3 | 8.0 | 0.4-0.6 | Rockwell C42 | DIN 6797 | 100 | 000000000 | 0000 |
| M5 | 5.3 | 10.0 | 0.5-0.7 | Rockwell C42 | DIN 6797 | 100 | 000000000 | 0000 |
| M6 | 6.4 | 11.0 | 0.6-0.8 | Rockwell C42 | DIN 6797 | 100 | 000000000 | 0000 |
| M7 | 7.4 | 12.5 | 0.7-0.9 | Rockwell C42 | DIN 6797 | 100 | 000000000 | 0000 |
| M8 | 8.4 | 15.0 | 0.7-0.9 | Rockwell C42 | DIN 6797 | 100 | 000000000 | 0000 |
| M10 | 10.5 | 18.0 | 0.8-1.0 | Rockwell C42 | DIN 6797 | 50 | 000000000 | 0000 |
| M12 | 13.0 | 20.5 | 0.9-1.2 | Rockwell C42 | DIN 6797 | 50 | 000000000 | 00000 |
| M14 | 15.0 | 24.0 | 0.9-1.2 | Rockwell C42 | DIN 6797 | 25 | 000000000 | 0000 |
| M16 | 17.0 | 26.0 | 1.0-1.4 | Rockwell C42 | DIN 6797 | 25 | 000000000 | 0000 |
| M18 | 19.0 | 30.0 | 1.2-1.5 | Rockwell C42 | DIN 6797 | 10 | 000000000 | 0000 |
| M20 | 21.0 | 33.0 | 1.2-1.5 | Rockwell C42 | DIN 6797 | 10 | 000000000 | 00000 |
| M24 | 25.0 | 38.0 | 1.3-1.6 | Rockwell C42 | DIN 6797 | 10 | 000000000 | 00000 |
18-8 Stainless Steel | ||||||||
| M2 | 2.2 | 4.5 | 0.2-0.4 | Not Rated | DIN 6797 | 100 | 000000000 | 0000 |
| M2.3 | 2.5 | 5.0 | 0.2-0.4 | Not Rated | DIN 6797 | 100 | 000000000 | 0000 |
| M2.5 | 2.7 | 5.5 | 0.2-0.5 | Not Rated | DIN 6797 | 100 | 000000000 | 0000 |
| M3 | 3.2 | 6.0 | 0.3-0.5 | Not Rated | DIN 6797 | 100 | 000000000 | 0000 |
| M3.5 | 3.7 | 7.0 | 0.4-0.6 | Not Rated | DIN 6797 | 100 | 000000000 | 0000 |
| M4 | 4.3 | 8.0 | 0.4-0.6 | Not Rated | DIN 6797 | 100 | 000000000 | 0000 |
| M5 | 5.3 | 10.0 | 0.5-0.7 | Not Rated | DIN 6797 | 100 | 000000000 | 0000 |
| M6 | 6.4 | 11.0 | 0.6-0.8 | Not Rated | DIN 6797 | 100 | 000000000 | 0000 |
| M7 | 7.4 | 12.5 | 0.7-0.9 | Not Rated | DIN 6797 | 50 | 000000000 | 00000 |
| M8 | 8.4 | 15.0 | 0.7-0.9 | Not Rated | DIN 6797 | 100 | 000000000 | 0000 |
| M10 | 10.5 | 18.0 | 0.8-1.0 | Not Rated | DIN 6797 | 50 | 000000000 | 0000 |
| M12 | 13.0 | 20.5 | 0.9-1.2 | Not Rated | DIN 6797 | 50 | 000000000 | 0000 |
| M14 | 15.0 | 24.0 | 0.9-1.2 | Not Rated | DIN 6797 | 25 | 000000000 | 0000 |
| M16 | 17.0 | 26.0 | 1.0-1.4 | Not Rated | DIN 6797 | 25 | 000000000 | 0000 |
| M18 | 19.0 | 30.0 | 1.2-1.5 | Not Rated | DIN 6797 | 10 | 000000000 | 0000 |
| M20 | 21.0 | 33.0 | 1.2-1.5 | Not Rated | DIN 6797 | 10 | 000000000 | 0000 |
| M22 | 23.0 | 36.0 | 1.3-1.6 | Not Rated | DIN 6797 | 10 | 000000000 | 0000 |
| M24 | 25.0 | 38.0 | 1.3-1.6 | Not Rated | DIN 6797 | 10 | 000000000 | 00000 |
Metric External-Tooth Lock Washers
Teeth on the outside edge of these washers bite into the screw head and joint for a tight grip. Use with fasteners that have heads large enough to make contact with the teeth, such as pan, button, and binding head screws.
Zinc-plated steel washers are corrosion resistant in wet environments.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
316 stainless steel washers have excellent resistance to chemicals and salt water. They may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID, mm | OD, mm | Thick., mm | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| M2 | 2.3 | 4.5 | 0.2-0.4 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 00000 |
| M2.5 | 2.8 | 5.5 | 0.3-0.5 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 0000 |
| M3 | 3.2 | 6.0 | 0.3-0.5 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 0000 |
| M3.5 | 3.9 | 7.0 | 0.9-1.2 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 0000 |
| M4 | 4.3 | 8.0 | 0.4-0.6 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 0000 |
| M5 | 5.3 | 10.0 | 0.5-0.7 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 0000 |
| M6 | 6.4 | 11.0 | 0.6-0.8 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 0000 |
| M7 | 7.4 | 12.5 | 0.7-0.9 | Rockwell C35 | DIN 6797 | 25 | 000000000 | 0000 |
| M8 | 8.4 | 15.0 | 0.7-0.9 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 0000 |
| M10 | 10.5 | 18.0 | 0.8-1.0 | Rockwell C35 | DIN 6797 | 50 | 000000000 | 0000 |
| M12 | 13.0 | 20.5 | 0.9-1.2 | Rockwell C35 | DIN 6797 | 25 | 000000000 | 0000 |
| M14 | 15.0 | 24.0 | 0.9-1.2 | Rockwell C35 | DIN 6797 | 25 | 000000000 | 0000 |
| M16 | 17.3 | 26.0 | 1.0-1.4 | Rockwell C35 | DIN 6797 | 25 | 000000000 | 0000 |
| M18 | 19.0 | 30.0 | 1.2-1.6 | Rockwell C35 | DIN 6797 | 5 | 000000000 | 0000 |
| M20 | 21.0 | 33.0 | 1.2-1.6 | Rockwell C35 | DIN 6797 | 5 | 000000000 | 0000 |
| M22 | 23.0 | 36.0 | 1.3-1.7 | Rockwell C35 | DIN 6797 | 5 | 000000000 | 0000 |
| M24 | 25.0 | 38.0 | 1.3-1.7 | Rockwell C35 | DIN 6797 | 5 | 000000000 | 0000 |
| M30 | 31.0 | 48.0 | 1.4-1.8 | Rockwell C35 | DIN 6797 | 5 | 000000000 | 0000 |
18-8 Stainless Steel | ||||||||
| M2 | 2.3 | 4.5 | 0.2-0.4 | __ | DIN 6797 | 100 | 000000000 | 0000 |
| M2.5 | 2.8 | 5.5 | 0.3-0.5 | __ | DIN 6797 | 100 | 000000000 | 0000 |
| M3 | 3.2 | 6.0 | 0.3-0.5 | __ | DIN 6797 | 100 | 000000000 | 0000 |
| M3.5 | 3.9 | 7.0 | 0.4-0.6 | __ | DIN 6797 | 100 | 000000000 | 0000 |
| M4 | 4.3 | 8.0 | 0.4-0.6 | __ | DIN 6797 | 100 | 000000000 | 0000 |
| M5 | 5.3 | 10.0 | 0.5-0.7 | __ | DIN 6797 | 100 | 000000000 | 0000 |
| M6 | 6.4 | 11.0 | 0.6-0.8 | __ | DIN 6797 | 100 | 000000000 | 0000 |
| M7 | 7.4 | 12.5 | 0.7-0.9 | __ | DIN 6797 | 100 | 000000000 | 0000 |
| M8 | 8.4 | 15.0 | 0.7-0.9 | __ | DIN 6797 | 100 | 000000000 | 0000 |
| M10 | 10.5 | 18.0 | 0.8-1.0 | __ | DIN 6797 | 100 | 000000000 | 0000 |
| M12 | 13.0 | 20.5 | 0.9-1.2 | __ | DIN 6797 | 50 | 000000000 | 0000 |
| M14 | 15.0 | 24.0 | 0.9-1.2 | __ | DIN 6797 | 50 | 000000000 | 00000 |
| M16 | 17.3 | 26.0 | 1.0-1.4 | __ | DIN 6797 | 50 | 000000000 | 00000 |
| M18 | 19.0 | 30.0 | 1.2-1.6 | __ | DIN 6797 | 10 | 000000000 | 0000 |
| M20 | 21.0 | 33.0 | 1.2-1.6 | __ | DIN 6797 | 10 | 000000000 | 0000 |
| M22 | 23.0 | 36.0 | 1.3-1.7 | __ | DIN 6797 | 10 | 000000000 | 0000 |
| M24 | 25.0 | 38.0 | 1.3-1.7 | __ | DIN 6797 | 10 | 000000000 | 0000 |
| M30 | 31.0 | 48.0 | 1.4-1.8 | __ | DIN 6797 | 10 | 000000000 | 00000 |
316 Stainless Steel | ||||||||
| M3 | 3.2 | 6.0 | 0.3-0.5 | __ | DIN 6797 | 5 | 000000000 | 0000 |
| M4 | 4.3 | 8.0 | 0.4-0.6 | __ | DIN 6797 | 5 | 000000000 | 0000 |
| M5 | 5.3 | 10.0 | 0.5-0.7 | __ | DIN 6797 | 5 | 000000000 | 0000 |
| M6 | 6.4 | 11.0 | 0.6-0.8 | __ | DIN 6797 | 5 | 000000000 | 0000 |
| M8 | 8.4 | 15.0 | 0.7-0.9 | __ | DIN 6797 | 5 | 000000000 | 00000 |
| M10 | 10.5 | 18.0 | 0.8-1.0 | __ | DIN 6797 | 1 | 000000000 | 0000 |
| M12 | 13.0 | 20.5 | 0.9-1.2 | __ | DIN 6797 | 1 | 000000000 | 00000 |
| M14 | 15.0 | 24.0 | 0.9-1.2 | __ | DIN 6797 | 1 | 000000000 | 00000 |
| M16 | 17.3 | 26.0 | 1.0-1.4 | __ | DIN 6797 | 1 | 000000000 | 00000 |
| M20 | 21.0 | 33.0 | 1.2-1.6 | __ | DIN 6797 | 1 | 000000000 | 00000 |