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Washer Type Washer Type |
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| Flat | Tooth Lock |
Specifications Met Specifications Met |
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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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About Washers
More
Mil. Spec. Washers
Choose these washers for their adherence to strict military standards for material and construction.
Cadmium- and zinc yellow-chromate plated steel washers are corrosion resistant 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. | |
Cadmium-Plated Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
MS27183 | ||||||||
| No. 1 | 0.078" | 0.188" | 0.016"-0.025" | Rockwell B40 | MS27183-1 | 100 | 000000000 | 00000 |
| No. 2 | 0.094" | 0.250" | 0.016"-0.025" | Rockwell B40 | MS27183-2; ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 3 | 0.125" | 0.250" | 0.017"-0.028" | Rockwell B40 | MS27183-3 | 100 | 000000000 | 0000 |
| No. 4 | 0.125" | 0.312" | 0.025"-0.040" | Rockwell B40 | MS27183-4; ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 4 | 0.125" | 0.375" | 0.025"-0.040" | Rockwell B40 | MS27183-44 | 100 | 000000000 | 0000 |
| No. 5 | 0.141" | 0.281" | 0.025"-0.040" | Rockwell B40 | MS27183-45 | 100 | 000000000 | 0000 |
| No. 6 | 0.156" | 0.250" | 0.013"-0.020" | Rockwell B40 | MS27183-43 | 100 | 000000000 | 0000 |
| No. 6 | 0.156" | 0.312" | 0.027"-0.048" | Rockwell B40 | MS27183-5 | 100 | 000000000 | 0000 |
| No. 6 | 0.156" | 0.375" | 0.036"-0.065" | Rockwell B40 | MS27183-6; ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.188" | 0.375" | 0.036"-0.065" | Rockwell B40 | MS27183-7 | 100 | 000000000 | 0000 |
| No. 8 | 0.188" | 0.438" | 0.036"-0.065" | Rockwell B40 | MS27183-41; ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.188" | 0.500" | 0.051"-0.080" | Rockwell B40 | MS27183-46 | 100 | 000000000 | 0000 |
| No. 10 | 0.219" | 0.365" | 0.025"-0.040" | Rockwell B40 | MS27183-47 | 100 | 000000000 | 0000 |
| No. 10 | 0.219" | 0.438" | 0.036"-0.065" | Rockwell B40 | MS27183-8 | 100 | 000000000 | 0000 |
| No. 10 | 0.219" | 0.500" | 0.036"-0.065" | Rockwell B40 | MS27183-42; ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 12 | 0.250" | 0.562" | 0.025"-0.040" | Rockwell B40 | MS27183-49 | 100 | 000000000 | 0000 |
| No. 12 | 0.250" | 0.562" | 0.051"-0.080" | Rockwell B40 | MS27183-9; ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 12 | 0.250" | 0.625" | 0.025"-0.040" | Rockwell B40 | MS27183-50 | 100 | 000000000 | 0000 |
| No. 12 | 0.250" | 0.938" | 0.051"-0.080" | Rockwell B40 | MS27183-48 | 25 | 000000000 | 0000 |
| No. 12 | 0.250" | 1.000" | 0.051"-0.080" | Rockwell B40 | MS27183-51 | 25 | 000000000 | 0000 |
| 1/4" | 0.281" | 0.625" | 0.051"-0.080" | Rockwell B40 | MS27183-10; ASME B18.21.1 | 100 | 000000000 | 0000 |
| 1/4" | 0.281" | 0.734" | 0.051"-0.080" | Rockwell B40 | MS27183-52 | 100 | 000000000 | 00000 |
| 1/4" | 0.312" | 0.500" | 0.027"-0.048" | Rockwell B40 | MS27183-54 | 50 | 000000000 | 00000 |
| 1/4" | 0.312" | 0.875" | 0.051"-0.075" | Rockwell B40 | MS27183-53 | 25 | 000000000 | 0000 |
| 1/4" | 0.313" | 0.734" | 0.051"-0.080" | Rockwell B40 | MS27183-11; ASME B18.21.1 | 50 | 000000000 | 0000 |
| 5/16" | 0.344" | 0.688" | 0.051"-0.080" | Rockwell B40 | MS27183-12; ASME B18.21.1 | 100 | 000000000 | 00000 |
| 5/16" | 0.375" | 0.625" | 0.027"-0.048" | Rockwell B40 | MS27183-56 | 50 | 000000000 | 0000 |
| 5/16" | 0.375" | 0.734" | 0.064"-0.094" | Rockwell B40 | MS27183-55 | 50 | 000000000 | 00000 |
| 5/16" | 0.375" | 0.875" | 0.064"-0.104" | Rockwell B40 | MS27183-13; ASME B18.21.1 | 50 | 000000000 | 0000 |
| 3/8" | 0.406" | 0.812" | 0.051"-0.080" | Rockwell B40 | MS27183-14; ASME B18.21.1 | 50 | 000000000 | 0000 |
| 3/8" | 0.406" | 0.875" | 0.051"-0.070" | Rockwell B40 | MS27183-57 | 50 | 000000000 | 0000 |
| 3/8" | 0.412" | 0.625" | 0.025"-0.040" | Rockwell B40 | MS27183-58 | 50 | 000000000 | 0000 |
| 3/8" | 0.438" | 0.875" | 0.051"-0.080" | Rockwell B40 | MS27183-60 | 50 | 000000000 | 00000 |
| 3/8" | 0.438" | 1.365" | 0.064"-0.104" | Rockwell B40 | MS27183-59 | 10 | 000000000 | 00000 |
| 3/8" | 0.438" | 1.625" | 0.051"-0.104" | Rockwell B40 | MS27183-61 | 10 | 000000000 | 00000 |
| 7/16" | 0.438" | 1.000" | 0.064"-0.104" | Rockwell B40 | MS27183-15 | 50 | 000000000 | 00000 |
| 7/16" | 0.469" | 0.734" | 0.051"-0.080" | Rockwell B40 | MS27183-62 | 50 | 000000000 | 00000 |
| 7/16" | 0.469" | 0.922" | 0.051"-0.080" | Rockwell B40 | MS27183-16; ASME B18.21.1 | 50 | 000000000 | 0000 |
| 7/16" | 0.500" | 1.250" | 0.064"-0.104" | Rockwell B40 | MS27183-17; ASME B18.21.1 | 50 | 000000000 | 00000 |
| 1/2" | 0.531" | 1.062" | 0.074"-0.121" | Rockwell B40 | MS27183-18; ASME B18.21.1 | 25 | 000000000 | 0000 |
| 1/2" | 0.562" | 1.375" | 0.086"-0.132" | Rockwell B40 | MS27183-19; ASME B18.21.1 | 10 | 000000000 | 0000 |
| 9/16" | 0.594" | 1.156" | 0.074"-0.121" | Rockwell B40 | MS27183-20; ASME B18.21.1 | 25 | 000000000 | 00000 |
| 5/8" | 0.656" | 1.312" | 0.074"-0.121" | Rockwell B40 | MS27183-21; ASME B18.21.1 | 25 | 000000000 | 00000 |
| 5/8" | 0.656" | 2.125" | 0.080"-0.115" | Rockwell B40 | MS27183-63 | 5 | 000000000 | 00000 |
| 5/8" | 0.688" | 1.750" | 0.108"-0.160" | Rockwell B40 | MS27183-22; ASME B18.21.1 | 10 | 000000000 | 00000 |
| 3/4" | 0.812" | 1.469" | 0.108"-0.160" | Rockwell B40 | MS27183-23; ASME B18.21.1 | 10 | 000000000 | 00000 |
| 3/4" | 0.812" | 2.000" | 0.122"-0.177" | Rockwell B40 | MS27183-24; ASME B18.21.1 | 5 | 000000000 | 00000 |
| 7/8" | 0.938" | 1.750" | 0.108"-0.160" | Rockwell B40 | MS27183-25; ASME B18.21.1 | 10 | 000000000 | 00000 |
| 7/8" | 0.938" | 2.250" | 0.136"-0.192" | Rockwell B40 | MS27183-26; ASME B18.21.1 | 5 | 000000000 | 00000 |
| 1" | 1.062" | 2.000" | 0.108"-0.160" | Rockwell B40 | MS27183-27; ASME B18.21.1 | 10 | 000000000 | 00000 |
| 1" | 1.062" | 2.500" | 0.136"-0.192" | Rockwell B40 | MS27183-28; ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1 1/8" | 1.250" | 2.750" | 0.136"-0.192" | Rockwell B40 | MS27183-29; ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1 1/4" | 1.375" | 3.000" | 0.136"-0.192" | Rockwell B40 | MS27183-30; ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1 3/8" | 1.500" | 3.250" | 0.153"-0.213" | Rockwell B40 | MS27183-31; ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1 1/2" | 1.625" | 3.500" | 0.153"-0.213" | Rockwell B40 | MS27183-32; ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1 5/8" | 1.750" | 3.750" | 0.153"-0.213" | Rockwell B40 | MS27183-33; ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1 3/4" | 1.875" | 4.000" | 0.153"-0.213" | Rockwell B40 | MS27183-34; ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1 7/8" | 2.000" | 4.250" | 0.153"-0.213" | Rockwell B40 | MS27183-35; ASME B18.21.1 | 1 | 000000000 | 00000 |
| 2" | 2.125" | 4.500" | 0.153"-0.213" | Rockwell B40 | MS27183-36; ASME B18.21.1 | 1 | 000000000 | 00000 |
MS20002 | ||||||||
| 1/4" | 0.260" | 0.531" | 0.052"-0.072" | Rockwell C26 | MS20002-4 | 25 | 000000000 | 0000 |
| 5/16" | 0.324" | 0.593" | 0.052"-0.072" | Rockwell C26 | MS20002-5 | 25 | 000000000 | 0000 |
| 3/8" | 0.385" | 0.687" | 0.052"-0.072" | Rockwell C26 | MS20002-6 | 25 | 000000000 | 0000 |
| 7/16" | 0.451" | 0.781" | 0.052"-0.072" | Rockwell C26 | MS20002-7 | 25 | 000000000 | 0000 |
| 1/2" | 0.515" | 0.875" | 0.052"-0.072" | Rockwell C26 | MS20002-8 | 25 | 000000000 | 00000 |
| 9/16" | 0.579" | 0.968" | 0.052"-0.072" | Rockwell C26 | MS20002-9 | 25 | 000000000 | 00000 |
| 5/8" | 0.643" | 1.062" | 0.052"-0.072" | Rockwell C26 | MS20002-10 | 10 | 000000000 | 00000 |
| 3/4" | 0.770" | 1.250" | 0.052"-0.072" | Rockwell C26 | MS20002-12 | 10 | 000000000 | 00000 |
| 7/8" | 0.897" | 1.437" | 0.052"-0.072" | Rockwell C26 | MS20002-14 | 10 | 000000000 | 00000 |
| 1" | 1.025" | 1.625" | 0.052"-0.072" | Rockwell C26 | MS20002-16 | 5 | 000000000 | 00000 |
NAS1149 | ||||||||
| No. 2 | 0.099" | 0.250" | 0.029"-0.035" | Not Rated | NAS1149-FN232P | 100 | 000000000 | 0000 |
| No. 4 | 0.125" | 0.312" | 0.014"-0.018" | Not Rated | NAS1149-FN416P | 100 | 000000000 | 0000 |
| No. 4 | 0.125" | 0.312" | 0.029"-0.035" | Not Rated | NAS1149-FN432P; ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 6 | 0.149" | 0.375" | 0.014"-0.018" | Not Rated | NAS1149-FN616P | 100 | 000000000 | 0000 |
| No. 6 | 0.149" | 0.375" | 0.029"-0.035" | Not Rated | NAS1149-FN632P | 100 | 000000000 | 0000 |
| No. 8 | 0.174" | 0.375" | 0.014"-0.018" | Not Rated | NAS1149-FN816P | 100 | 000000000 | 0000 |
| No. 8 | 0.174" | 0.375" | 0.029"-0.035" | Not Rated | NAS1149-FN832P | 100 | 000000000 | 0000 |
| No. 10 | 0.203" | 0.438" | 0.029"-0.035" | Not Rated | NAS1149-F0332P | 100 | 000000000 | 0000 |
| No. 10 | 0.203" | 0.438" | 0.059"-0.067" | Not Rated | NAS1149-F0363P | 100 | 000000000 | 0000 |
| 1/4" | 0.265" | 0.500" | 0.029"-0.035" | Not Rated | NAS1149-F0432P | 100 | 000000000 | 0000 |
| 1/4" | 0.265" | 0.500" | 0.059"-0.067" | Not Rated | NAS1149-F0463P | 100 | 000000000 | 0000 |
| 5/16" | 0.328" | 0.562" | 0.029"-0.035" | Not Rated | NAS1149-F0532P | 100 | 000000000 | 0000 |
| 5/16" | 0.328" | 0.562" | 0.059"-0.067" | Not Rated | NAS1149-F0563P | 100 | 000000000 | 0000 |
| 3/8" | 0.390" | 0.625" | 0.029"-0.035" | Not Rated | NAS1149-F0632P | 100 | 000000000 | 0000 |
| 3/8" | 0.390" | 0.625" | 0.059"-0.067" | Not Rated | NAS1149-F0663P | 100 | 000000000 | 0000 |
| 7/16" | 0.453" | 0.750" | 0.029"-0.035" | Not Rated | NAS1149-F0732P | 100 | 000000000 | 0000 |
| 7/16" | 0.453" | 0.750" | 0.059"-0.067" | Not Rated | NAS1149-F0763P | 100 | 000000000 | 0000 |
| 1/2" | 0.515" | 0.875" | 0.029"-0.035" | Not Rated | NAS1149-F0832P | 100 | 000000000 | 0000 |
| 1/2" | 0.515" | 0.875" | 0.059"-0.067" | Not Rated | NAS1149-F0863P | 100 | 000000000 | 00000 |
| 9/16" | 0.578" | 1.062" | 0.059"-0.067" | Not Rated | NAS1149-F0963P | 50 | 000000000 | 0000 |
| 5/8" | 0.640" | 1.188" | 0.029"-0.035" | Not Rated | NAS1149-F1032P | 50 | 000000000 | 0000 |
| 5/8" | 0.640" | 1.188" | 0.059"-0.067" | Not Rated | NAS1149-F1063P | 50 | 000000000 | 00000 |
AN970/NASM970 | ||||||||
| No. 10 | 0.203" | 0.875" | 0.053"-0.073" | Rockwell B40 | AN970-3; NASM970 | 100 | 000000000 | 0000 |
| 1/4" | 0.265" | 1.125" | 0.053"-0.073" | Rockwell B40 | AN970-4; NASM970 | 50 | 000000000 | 0000 |
| 5/16" | 0.328" | 1.375" | 0.053"-0.073" | Rockwell B40 | AN970-5; NASM970 | 50 | 000000000 | 00000 |
| 3/8" | 0.390" | 1.625" | 0.053"-0.073" | Rockwell B40 | AN970-6; NASM970 | 25 | 000000000 | 0000 |
| 7/16" | 0.453" | 1.812" | 0.099"-0.119" | Rockwell B40 | AN970-7; NASM970 | 10 | 000000000 | 0000 |
| 1/2" | 0.515" | 2.000" | 0.099"-0.119" | Rockwell B40 | AN970-8; NASM970 | 10 | 000000000 | 0000 |
| 9/16" | 0.578" | 2.188" | 0.115"-0.135" | Rockwell B40 | AN970-9; NASM970 | 5 | 000000000 | 0000 |
| 5/8" | 0.640" | 2.375" | 0.115"-0.135" | Rockwell B40 | AN970-10; NASM970 | 5 | 000000000 | 0000 |
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.
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 |