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Tooth Location Tooth Location |
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 | Internal |
 | Internal/External |
 | External |
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Finish Finish |
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ID ID |
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OD OD |
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Container Features Container Features |
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Minimum Thickness Minimum Thickness |
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Maximum Thickness Maximum Thickness |
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Hardness Hardness |
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Specifications Met Specifications Met |
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About Washers
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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.
316 stainless steel washers have excellent resistance to chemicals and salt water. They may be mildly magnetic.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
400 series stainless steel washers have excellent wear resistance, but aren’t as corrosion resistant as other stainless steel washers. They may be mildly magnetic.
Zinc-plated steel washers are corrosion resistant in wet environments.
Bronze washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.
Washers that meet ASME B18.21.1 adhere to strict dimensional standards. The zinc-plated steel washers also meet standards for material properties.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thickness | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
316 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 4 | 0.115" | 0.270" | 0.012"-0.018" | Not Rated | ASME B18.21.1 | 5 | 000000000 | 00000 |
| No. 6 | 0.141" | 0.295" | 0.016"-0.022" | Not Rated | ASME B18.21.1 | 5 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.340" | 0.018"-0.023" | Not Rated | ASME B18.21.1 | 5 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.381" | 0.018"-0.024" | Not Rated | ASME B18.21.1 | 5 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.478" | 0.023"-0.028" | Not Rated | ASME B18.21.1 | 5 | 000000000 | 0000 |
| 5/16" | 0.320" | 0.610" | 0.028"-0.034" | Not Rated | ASME B18.21.1 | 5 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.692" | 0.032"-0.040" | Not Rated | ASME B18.21.1 | 5 | 000000000 | 0000 |
18-8 Stainless Steel | ||||||||
| No. 4 | 0.115" | 0.270" | 0.012"-0.018" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.295" | 0.016"-0.022" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.340" | 0.018"-0.023" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.381" | 0.018"-0.024" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.478" | 0.023"-0.028" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 5/16" | 0.320" | 0.610" | 0.028"-0.034" | Not Rated | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.692" | 0.032"-0.040" | Not Rated | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 1/2" | 0.512" | 0.900" | 0.037"-0.045" | Rockwell C40 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 9/16" | 0.576" | 0.985" | 0.037"-0.045" | Rockwell C40 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 5/8" | 0.640" | 1.071" | 0.042"-0.050" | Rockwell C40 | ASME B18.21.1 | 10 | 000000000 | 00000 |
| 3/4" | 0.769" | 1.245" | 0.047"-0.055" | Rockwell C40 | ASME B18.21.1 | 5 | 000000000 | 0000 |
400 Series Stainless Steel | ||||||||
| No. 2 | 0.089" | 0.200" | 0.010"-0.016" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 3 | 0.102" | 0.232" | 0.010"-0.016" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 4 | 0.115" | 0.270" | 0.012"-0.018" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 5 | 0.129" | 0.280" | 0.014"-0.020" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.295" | 0.016"-0.022" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.340" | 0.018"-0.023" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.381" | 0.018"-0.024" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 12 | 0.221" | 0.410" | 0.020"-0.027" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.478" | 0.023"-0.028" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 5/16" | 0.320" | 0.610" | 0.028"-0.034" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.692" | 0.032"-0.040" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 7/16" | 0.448" | 0.789" | 0.032"-0.040" | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 1/2" | 0.512" | 0.900" | 0.037"-0.045" | Rockwell C34 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 9/16" | 0.576" | 0.985" | 0.037"-0.045" | Rockwell C34 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 5/8" | 0.640" | 1.071" | 0.042"-0.050" | Rockwell C34 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 3/4" | 0.769" | 1.245" | 0.047"-0.055" | Rockwell C34 | ASME B18.21.1 | 25 | 000000000 | 00000 |
Zinc-Plated Grade 8 Steel | ||||||||
| 1/4" | 0.256" | 0.536" | 0.034"-0.044" | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 5/16" | 0.320" | 0.607" | 0.040"-0.050" | Rockwell C44 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 3/8" | 0.384" | 0.747" | 0.040"-0.050" | Rockwell C44 | ASME B18.21.1 | 25 | 000000000 | 00000 |
| 1/2" | 0.512" | 0.923" | 0.054"-0.070" | Rockwell C44 | ASME B18.21.1 | 10 | 000000000 | 00000 |
| 5/8" | 0.640" | 1.134" | 0.054"-0.070" | Rockwell C44 | ASME B18.21.1 | 5 | 000000000 | 00000 |
| 3/4" | 0.768" | 1.260" | 0.073"-0.083" | Rockwell C44 | ASME B18.21.1 | 5 | 000000000 | 00000 |
Zinc-Plated Steel | ||||||||
| No. 2 | 0.089" | 0.200" | 0.010"-0.016" | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 3 | 0.102" | 0.232" | 0.010"-0.016" | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 4 | 0.115" | 0.270" | 0.012"-0.018" | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 5 | 0.129" | 0.280" | 0.014"-0.020" | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.295" | 0.016"-0.022" | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.340" | 0.018"-0.023" | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.381" | 0.018"-0.024" | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 12 | 0.221" | 0.410" | 0.020"-0.027" | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.478" | 0.023"-0.028" | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 5/16" | 0.320" | 0.610" | 0.028"-0.034" | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.692" | 0.032"-0.040" | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 7/16" | 0.448" | 0.789" | 0.032"-0.040" | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 1/2" | 0.512" | 0.900" | 0.037"-0.045" | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 9/16" | 0.576" | 0.985" | 0.037"-0.045" | Rockwell C44 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 5/8" | 0.640" | 1.071" | 0.042"-0.050" | Rockwell C44 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 3/4" | 0.769" | 1.245" | 0.047"-0.055" | Rockwell C44 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 7/8" | 0.894" | 1.410" | 0.052"-0.060" | Rockwell C44 | ASME B18.21.1 | 25 | 000000000 | 00000 |
| 1" | 1.019" | 1.637" | 0.059"-0.067" | Rockwell C44 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 1 1/8" | 1.144" | 1.830" | 0.059"-0.067" | Rockwell C44 | ASME B18.21.1 | 10 | 000000000 | 0000 |
| 1 1/4" | 1.275" | 1.975" | 0.059"-0.067" | Rockwell C44 | ASME B18.21.1 | 5 | 000000000 | 00000 |
| 1 3/8" | 1.394" | 1.950" | 0.060"-0.064" | Rockwell C44 | __ | 1 | 000000000 | 0000 |
| 1 1/2" | 1.500" | 2.515" | 0.076"-0.080" | Rockwell C44 | __ | 1 | 000000000 | 0000 |
Bronze | ||||||||
| No. 2 | 0.089" | 0.200" | 0.010"-0.016" | Rockwell B60 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 4 | 0.115" | 0.270" | 0.012"-0.018" | Rockwell B60 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.295" | 0.016"-0.022" | Rockwell B60 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.340" | 0.018"-0.023" | Rockwell B60 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.381" | 0.018"-0.024" | Rockwell B60 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.478" | 0.023"-0.028" | Rockwell B60 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| 5/16" | 0.320" | 0.610" | 0.028"-0.034" | Rockwell B60 | ASME B18.21.1 | 50 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.692" | 0.032"-0.040" | Rockwell B60 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 7/16" | 0.448" | 0.789" | 0.032"-0.040" | Rockwell B60 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 1/2" | 0.512" | 0.900" | 0.037"-0.045" | Rockwell B60 | ASME B18.21.1 | 25 | 000000000 | 00000 |
| 5/8" | 0.640" | 1.071" | 0.042"-0.050" | Rockwell B60 | ASME B18.21.1 | 5 | 000000000 | 0000 |
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.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
Black-oxide steel washers are mildly corrosion resistant in dry environments.
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. | |
18-8 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| M2 | 2.2 | 4.5 | 0.2-0.4 | __ | DIN 6797 | 100 | 000000000 | 00000 |
| M2.5 | 2.7 | 5.5 | 0.2-0.5 | __ | DIN 6797 | 100 | 000000000 | 0000 |
| M3 | 3.2 | 6.0 | 0.3-0.5 | __ | 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 |
| 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 | 50 | 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 | 25 | 000000000 | 0000 |
| M16 | 17.0 | 26.0 | 1.0-1.4 | __ | DIN 6797 | 25 | 000000000 | 0000 |
| M18 | 19.0 | 30.0 | 1.2-1.5 | __ | DIN 6797 | 10 | 000000000 | 0000 |
| M20 | 21.0 | 33.0 | 1.2-1.5 | __ | DIN 6797 | 10 | 000000000 | 0000 |
Black-Oxide Steel | ||||||||
| M2 | 2.2 | 4.5 | 0.2-0.4 | Rockwell C35 | DIN 6797 | 100 | 000000000 | 0000 |
| 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 |
Mil. Spec. Internal-Tooth Lock Washers
Choose these washers for their adherence to strict military standards for material and construction. 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.
Cadmium-plated steel washers are corrosion resistant in wet environments.
Bronze washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.
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. | |
Cadmium-Plated Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
MS-35333/NASM 35333 | ||||||||
| No. 2 | 0.089" | 0.200" | 0.010"-0.015" | Rockwell C40-50 | ASME B18.21.1; MS-35333-35; NASM 35333-35 | 25 | 000000000 | 00000 |
| No. 4 | 0.115" | 0.270" | 0.015"-0.019" | Rockwell C40-50 | ASME B18.21.1; MS-35333-36; NASM 35333-36 | 25 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.295" | 0.017"-0.021" | Rockwell C40-50 | ASME B18.21.1; MS-35333-37; NASM 35333-37 | 25 | 000000000 | 0000 |
| No. 8 | 0.168" | 0.340" | 0.018"-0.023" | Rockwell C40-50 | ASME B18.21.1; MS-35333-38; NASM 35333-38 | 25 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.381" | 0.020"-0.025" | Rockwell C40-50 | ASME B18.21.1; MS-35333-39; NASM 35333-39 | 25 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.478" | 0.023"-0.028" | Rockwell C40-50 | ASME B18.21.1; MS-35333-40; NASM 35333-40 | 25 | 000000000 | 0000 |
| 5/16" | 0.332" | 0.610" | 0.028"-0.034" | Rockwell C40-50 | ASME B18.21.1; MS-35333-41; NASM 35333-41 | 25 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.692" | 0.032"-0.040" | Rockwell C40-50 | ASME B18.21.1; MS-35333-42; NASM 35333-42 | 25 | 000000000 | 00000 |
| 7/16" | 0.448" | 0.789" | 0.032"-0.040" | Rockwell C40-50 | ASME B18.21.1; MS-35333-43; NASM 35333-43 | 25 | 000000000 | 00000 |
| 1/2" | 0.512" | 0.900" | 0.037"-0.045" | Rockwell C40-50 | ASME B18.21.1; MS-35333-44; NASM 35333-44 | 25 | 000000000 | 00000 |
| 5/8" | 0.640" | 1.071" | 0.042"-0.050" | Rockwell C40-50 | ASME B18.21.1; MS-35333-46; NASM 35333-46 | 10 | 000000000 | 0000 |
| 3/4" | 0.769" | 1.245" | 0.047"-0.055" | Rockwell C40-50 | ASME B18.21.1; MS-35333-47; NASM 35333-47 | 10 | 000000000 | 0000 |
| 7/8" | 0.894" | 1.410" | 0.052"-0.060" | Rockwell C40-50 | ASME B18.21.1; MS-35333-48; NASM 35333-48 | 10 | 000000000 | 00000 |
| 1" | 1.019" | 1.637" | 0.059"-0.067" | Rockwell C40-50 | ASME B18.21.1; MS-35333-49; NASM 35333-49 | 5 | 000000000 | 0000 |
| 1 1/4" | 1.260" | 1.950" | 0.059"-0.067" | Rockwell C40-50 | ASME B18.21.1; MS-35333-51; NASM 35333-51 | 5 | 000000000 | 0000 |
Bronze | ||||||||
MS-35333/NASM 35333 | ||||||||
| No. 2 | 0.089" | 0.200" | 0.010"-0.015" | Rockwell B90 | ASME B18.21.1; MS-35333-103; NASM 35333-103 | 25 | 000000000 | 0000 |
| No. 4 | 0.115" | 0.270" | 0.015"-0.019" | Rockwell B90 | ASME B18.21.1; MS-35333-104; NASM 35333-104 | 25 | 000000000 | 0000 |
| No. 6 | 0.141" | 0.295" | 0.017"-0.021" | Rockwell B90 | ASME B18.21.1; MS-35333-105; NASM 35333-105 | 25 | 000000000 | 00000 |
| No. 8 | 0.168" | 0.340" | 0.018"-0.023" | Rockwell B90 | ASME B18.21.1; MS-35333-106; NASM 35333-106 | 25 | 000000000 | 00000 |
| No. 10 | 0.195" | 0.381" | 0.020"-0.025" | Rockwell B90 | ASME B18.21.1; MS-35333-107; NASM 35333-107 | 25 | 000000000 | 00000 |
| 1/4" | 0.256" | 0.478" | 0.023"-0.028" | Rockwell B90 | ASME B18.21.1; MS-35333-108; NASM 35333-108 | 25 | 000000000 | 00000 |
| 5/16" | 0.332" | 0.610" | 0.028"-0.034" | Rockwell B90 | ASME B18.21.1; MS-35333-109; NASM 35333-109 | 10 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.692" | 0.032"-0.040" | Rockwell B90 | ASME B18.21.1; MS-35333-110; NASM 35333-110 | 10 | 000000000 | 0000 |
| 1/2" | 0.512" | 0.900" | 0.037"-0.045" | Rockwell B90 | ASME B18.21.1; MS-35333-113; NASM 35333-113 | 5 | 000000000 | 0000 |
| 5/8" | 0.640" | 1.071" | 0.042"-0.050" | Rockwell B90 | ASME B18.21.1; MS-35333-115; NASM 35333-115 | 1 | 000000000 | 0000 |
| 3/4" | 0.769" | 1.245" | 0.047"-0.055" | Rockwell B90 | ASME B18.21.1; MS-35333-116; NASM 35333-116 | 1 | 000000000 | 0000 |
410 Stainless Steel | ||||||||
MS-35333/NASM 35333 | ||||||||
| No. 2 | 0.089" | 0.200" | 0.010"-0.015" | Rockwell C40-50 | ASME B18.21.1; MS-35333-69; NASM 35333-69 | 25 | 000000000 | 0000 |
| No. 4 | 0.115" | 0.270" | 0.015"-0.019" | Rockwell C40-50 | ASME B18.21.1; MS-35333-70; NASM 35333-70 | 25 | 000000000 | 00000 |
| No. 6 | 0.141" | 0.295" | 0.017"-0.021" | Rockwell C40-50 | ASME B18.21.1; MS-35333-71; NASM 35333-71 | 25 | 000000000 | 00000 |
| No. 8 | 0.168" | 0.340" | 0.018"-0.023" | Rockwell C40-50 | ASME B18.21.1; MS-35333-72; NASM 35333-72 | 25 | 000000000 | 00000 |
| No. 10 | 0.195" | 0.381" | 0.020"-0.025" | Rockwell C40-50 | ASME B18.21.1; MS-35333-73; NASM 35333-73 | 25 | 000000000 | 00000 |
| 1/4" | 0.256" | 0.478" | 0.023"-0.028" | Rockwell C40-50 | ASME B18.21.1; MS-35333-74; NASM 35333-74 | 25 | 000000000 | 00000 |
| 5/16" | 0.332" | 0.610" | 0.028"-0.034" | Rockwell C40-50 | ASME B18.21.1; MS-35333-75; NASM 35333-75 | 25 | 000000000 | 0000 |
| 3/8" | 0.384" | 0.692" | 0.032"-0.040" | Rockwell C40-50 | ASME B18.21.1; MS-35333-76; NASM 35333-76 | 25 | 000000000 | 00000 |
| 7/16" | 0.448" | 0.789" | 0.032"-0.040" | Rockwell C40-50 | ASME B18.21.1; MS-35333-77; NASM 35333-77 | 25 | 000000000 | 00000 |
| 1/2" | 0.512" | 0.900" | 0.037"-0.045" | Rockwell C40-50 | ASME B18.21.1; MS-35333-78; NASM 35333-78 | 10 | 000000000 | 00000 |
| 5/8" | 0.640" | 1.071" | 0.042"-0.050" | Rockwell C40-50 | ASME B18.21.1; MS-35333-80; NASM 35333-80 | 10 | 000000000 | 00000 |
| 3/4" | 0.769" | 1.245" | 0.047"-0.055" | Rockwell C40-50 | ASME B18.21.1; MS-35333-81; NASM 35333-81 | 5 | 000000000 | 00000 |
| 7/8" | 0.894" | 1.410" | 0.052"-0.060" | Rockwell C40-50 | ASME B18.21.1; MS-35333-82; NASM 35333-82 | 5 | 000000000 | 00000 |
Internal-Tooth Lock Washers for Soft Material
Slightly domed with an oversized outside diameter, these washers distribute your fastener's load over a larger surface area than other internal-tooth lock washers to limit damage to soft material. Internal teeth dig into the screw head to prevent joints from loosening under vibration. Washers are zinc-plated steel for corrosion resistance in wet environments.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Hardness | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | |||||||
|---|---|---|---|---|---|---|---|
| No. 6 | 0.146" | 0.569" | 0.023"-0.027" | Rockwell C44 | 10 | 000000000 | 00000 |
| No. 8 | 0.168" | 0.569" | 0.023"-0.027" | Rockwell C44 | 10 | 000000000 | 00000 |
| No. 10 | 0.195" | 0.569" | 0.027"-0.031" | Rockwell C44 | 10 | 000000000 | 0000 |
| 1/4" | 0.256" | 0.698" | 0.048"-0.052" | Rockwell C44 | 5 | 000000000 | 0000 |
| 5/16" | 0.320" | 0.885" | 0.060"-0.064" | Rockwell C44 | 5 | 000000000 | 00000 |
| 3/8" | 0.384" | 1.010" | 0.060"-0.064" | Rockwell C44 | 5 | 000000000 | 0000 |
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. Washers are zinc-plated steel for corrosion resistance in wet environments.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 4 | 0.116" | 0.478" | 0.016"-0.018" | Rockwell C40 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 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 | 0000 |
| 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 | 00000 |
| 5/8" | 0.640" | 1.620" | 0.060"-0.064" | Rockwell C40 | ASME B18.21.1 | 5 | 000000000 | 0000 |
Tooth Lock Washer Assortments
 |  External Tooth |
 Internal Tooth |
Teeth bite into the joint for a tighter grip than split lock washers. Made from zinc-plated steel, these washers resist corrosion in wet environments.
| Number of Pieces | Includes | Container Type | Each | |
Inch | ||||
|---|---|---|---|---|
Zinc-Plated Steel | ||||
| 1,335 | 635 External Tooth Lock Washers (For No. 4 to 1/2" Screw Sizes) 700 Internal Tooth Lock Washers (For No. 2 to 3/8" Screw Sizes) | Plastic Box | 000000000 | 000000 |