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Internal-/External-Tooth Lock Washers
The combination of internal and external teeth boosts gripping power to maintain a tight hold and provide more vibration resistance than other tooth lock washers. Use with fasteners that have heads large enough to make contact with the external teeth, such as pan, button, and binding head screws.
Black-oxide steel washers are mildly corrosion resistant in dry environments. Zinc-plated steel washers are corrosion resistant in wet environments.
410 stainless steel washers have excellent wear resistance.
For technical drawings and 3-D models, click on a part number.
| For Screw Size  | ID | OD | Thick. | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Black-Oxide Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 6 | 0.142" | 0.506" | 0.023"-0.027" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| No. 8 | 0.168" | 0.506" | 0.023"-0.027" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| No. 10 | 0.195" | 0.601" | 0.027"-0.031" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 1/4" | 0.256" | 0.760" | 0.033"-0.037" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 5/16" | 0.320" | 0.898" | 0.033"-0.037" | Rockwell C40 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 3/8" | 0.384" | 0.985" | 0.037"-0.041" | Rockwell C40 | ASME B18.21.1 | 25 | 000000000 | 00000 |
| 7/16" | 0.448" | 1.070" | 0.043"-0.047" | Rockwell C40 | ASME B18.21.1 | 25 | 000000000 | 00000 |
| 1/2" | 0.512" | 1.260" | 0.048"-0.052" | Rockwell C40 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 5/8" | 0.640" | 1.620" | 0.060"-0.064" | Rockwell C40 | ASME B18.21.1 | 10 | 000000000 | 00000 |
Zinc-Plated Steel | ||||||||
| No. 4 | 0.116" | 0.478" | 0.016"-0.018" | Rockwell C40 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| No. 6 | 0.142" | 0.506" | 0.023"-0.027" | Rockwell C40 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.506" | 0.023"-0.027" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| No. 10 | 0.195" | 0.601" | 0.027"-0.031" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 1/4" | 0.256" | 0.760" | 0.033"-0.037" | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 5/16" | 0.320" | 0.898" | 0.033"-0.037" | Rockwell C40 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 3/8" | 0.384" | 0.985" | 0.037"-0.041" | Rockwell C40 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 7/16" | 0.448" | 1.070" | 0.043"-0.047" | Rockwell C40 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 1/2" | 0.512" | 1.260" | 0.048"-0.052" | Rockwell C40 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 5/8" | 0.640" | 1.620" | 0.060"-0.064" | Rockwell C40 | ASME B18.21.1 | 5 | 000000000 | 00000 |
| M3 | 3.200mm | 12.000mm | 1.400mm-1.700mm | Not Rated | __ | 50 | 000000000 | 00000 |
| M4 | 4.300mm | 15.000mm | 1.900mm-2.300mm | Not Rated | __ | 50 | 000000000 | 00000 |
| M4 | 4.300mm | 18.000mm | 2.200mm-2.600mm | Not Rated | __ | 25 | 000000000 | 0000 |
| M5 | 5.300mm | 18.000mm | 2.200mm-2.600mm | Not Rated | __ | 25 | 000000000 | 00000 |
| M6 | 6.500mm | 18.000mm | 2.200mm-2.600mm | Not Rated | __ | 25 | 000000000 | 00000 |
| M8 | 8.500mm | 22.000mm | 2.700mm-3.300mm | Not Rated | __ | 25 | 000000000 | 00000 |
| M10 | 10.500mm | 26.000mm | 2.700mm-3.300mm | Not Rated | __ | 10 | 000000000 | 00000 |
| M12 | 12.500mm | 30.000mm | 3.200mm-4.000mm | Not Rated | __ | 10 | 000000000 | 00000 |
| M16 | 16.500mm | 35.000mm | 3.800mm-4.600mm | Not Rated | __ | 5 | 000000000 | 00000 |
410 Stainless Steel | ||||||||
| No. 4 | 0.115" | 0.475" | 0.016"-0.021" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.510" | 0.023"-0.028" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.610" | 0.028"-0.034" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.610" | 0.028"-0.034" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.760" | 0.032"-0.040" | Not Rated | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 5/16" | 0.320" | 0.900" | 0.032"-0.040" | Not Rated | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.985" | 0.037"-0.045" | Not Rated | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 1/2" | 0.512" | 1.260" | 0.047"-0.055" | Not Rated | ASME B18.21.1 | 10 | 000000000 | 0000 |