Mil. Spec. Internal-Tooth Lock Washers

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Mil. Spec. Internal-Tooth Lock Washers

Mil. Spec. Internal-Tooth Lock Washers are critical components in preventing fastener loosening due to vibration, thermal expansion, or dynamic loads. Our selection includes split, tooth, and wedge-lock designs manufactured from high-strength materials like spring steel and stainless steel. These washers provide a reliable mechanical lock by creating tension or biting into the mating surface, ensuring long-term structural integrity in automotive, aerospace, and heavy machinery applications. Engineered to meet rigorous industrial standards, they offer exceptional performance in high-vibration environments.

For Screw Size
1 1/4" 1" 1/2" 1/4" 3/4" 3/8" 5/16" 5/8" 7/16" 7/8" No. 10 No. 2 No. 4 No. 6 No. 8
Specifications Met
ASME B18.21.1; MS35333-103; NASM35333 ASME B18.21.1; MS35333-104; NASM35333 ASME B18.21.1; MS35333-105; NASM35333 ASME B18.21.1; MS35333-106; NASM35333 ASME B18.21.1; MS35333-107; NASM35333 ASME B18.21.1; MS35333-108; NASM35333 ASME B18.21.1; MS35333-109; NASM35333 ASME B18.21.1; MS35333-110; NASM35333 ASME B18.21.1; MS35333-113; NASM35333 ASME B18.21.1; MS35333-35; NASM35333 ASME B18.21.1; MS35333-36; NASM35333 ASME B18.21.1; MS35333-37; NASM35333 ASME B18.21.1; MS35333-38; NASM35333 ASME B18.21.1; MS35333-39; NASM35333 ASME B18.21.1; MS35333-40; NASM35333 ASME B18.21.1; MS35333-41; NASM35333 ASME B18.21.1; MS35333-42; NASM35333 ASME B18.21.1; MS35333-43; NASM35333 ASME B18.21.1; MS35333-44; NASM35333 ASME B18.21.1; MS35333-46; NASM35333 ASME B18.21.1; MS35333-47; NASM35333 ASME B18.21.1; MS35333-48; NASM35333 ASME B18.21.1; MS35333-49; NASM35333 ASME B18.21.1; MS35333-51; NASM35333 ASME B18.21.1; MS35333-69; NASM35333 ASME B18.21.1; MS35333-70; NASM35333 ASME B18.21.1; MS35333-71; NASM35333 ASME B18.21.1; MS35333-72; NASM35333 ASME B18.21.1; MS35333-73; NASM35333 ASME B18.21.1; MS35333-74; NASM35333 ASME B18.21.1; MS35333-75; NASM35333 ASME B18.21.1; MS35333-76; NASM35333 ASME B18.21.1; MS35333-77; NASM35333 ASME B18.21.1; MS35333-78; NASM35333 ASME B18.21.1; MS35333-80; NASM35333 ASME B18.21.1; MS35333-81; NASM35333 ASME B18.21.1; MS35333-82; NASM35333
ID
0.089" 0.115" 0.141" 0.168" 0.195" 0.256" 0.332" 0.384" 0.448" 0.512" 0.64" 0.769" 0.894" 1.019" 1.26"
OD
0.2" 0.27" 0.295" 0.34" 0.381" 0.478" 0.61" 0.692" 0.789" 0.9" 1.071" 1.245" 1.41" 1.637" 1.95"
Material
410 Stainless Steel Bronze Cadmium-Plated Steel
Thickness
0.010-0.015" 0.015-0.019" 0.017-0.021" 0.018-0.023" 0.020-0.025" 0.023-0.028" 0.028-0.034" 0.032-0.040" 0.037-0.045" 0.042-0.050" 0.047-0.055" 0.052-0.060" 0.059-0.067"
Part Number Material For Screw Size ID OD Thickness Washer Type Hardness Specifications Met Fastener Strength Grade/Class
1321FA00005 410 Stainless Steel 1/2" 0.512" 0.9" 0.037-0.045" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-78; NASM35333 -
1321FA00037 410 Stainless Steel 1/4" 0.256" 0.478" 0.023-0.028" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-74; NASM35333 -
1321FA00007 410 Stainless Steel 3/4" 0.769" 1.245" 0.047-0.055" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-81; NASM35333 -
1321FA00003 410 Stainless Steel 3/8" 0.384" 0.692" 0.032-0.040" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-76; NASM35333 -
1321FA00002 410 Stainless Steel 5/16" 0.332" 0.61" 0.028-0.034" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-75; NASM35333 -
1321FA00006 410 Stainless Steel 5/8" 0.64" 1.071" 0.042-0.050" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-80; NASM35333 -
1321FA00004 410 Stainless Steel 7/16" 0.448" 0.789" 0.032-0.040" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-77; NASM35333 -
1321FA00008 410 Stainless Steel 7/8" 0.894" 1.41" 0.052-0.060" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-82; NASM35333 -
1321FA00036 410 Stainless Steel No. 10 0.195" 0.381" 0.020-0.025" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-73; NASM35333 -
1321FA00001 410 Stainless Steel No. 2 0.089" 0.2" 0.010-0.015" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-69; NASM35333 -
1321FA00033 410 Stainless Steel No. 4 0.115" 0.27" 0.015-0.019" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-70; NASM35333 -
1321FA00034 410 Stainless Steel No. 6 0.141" 0.295" 0.017-0.021" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-71; NASM35333 -
1321FA00035 410 Stainless Steel No. 8 0.168" 0.34" 0.018-0.023" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-72; NASM35333 -
1321FA00032 Bronze 1/2" 0.512" 0.9" 0.037-0.045" Tooth Lock Rockwell B90 ASME B18.21.1; MS35333-113; NASM35333 -
1321FA00029 Bronze 1/4" 0.256" 0.478" 0.023-0.028" Tooth Lock Rockwell B90 ASME B18.21.1; MS35333-108; NASM35333 -
1321FA00031 Bronze 3/8" 0.384" 0.692" 0.032-0.040" Tooth Lock Rockwell B90 ASME B18.21.1; MS35333-110; NASM35333 -
1321FA00030 Bronze 5/16" 0.332" 0.61" 0.028-0.034" Tooth Lock Rockwell B90 ASME B18.21.1; MS35333-109; NASM35333 -
1321FA00028 Bronze No. 10 0.195" 0.381" 0.020-0.025" Tooth Lock Rockwell B90 ASME B18.21.1; MS35333-107; NASM35333 -
1321FA00024 Bronze No. 2 0.089" 0.2" 0.010-0.015" Tooth Lock Rockwell B90 ASME B18.21.1; MS35333-103; NASM35333 -
1321FA00025 Bronze No. 4 0.115" 0.27" 0.015-0.019" Tooth Lock Rockwell B90 ASME B18.21.1; MS35333-104; NASM35333 -
1321FA00026 Bronze No. 6 0.141" 0.295" 0.017-0.021" Tooth Lock Rockwell B90 ASME B18.21.1; MS35333-105; NASM35333 -
1321FA00027 Bronze No. 8 0.168" 0.34" 0.018-0.023" Tooth Lock Rockwell B90 ASME B18.21.1; MS35333-106; NASM35333 -
1321FA00023 Cadmium-Plated Steel 1 1/4" 1.26" 1.95" 0.059-0.067" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-51; NASM35333 -
1321FA00022 Cadmium-Plated Steel 1" 1.019" 1.637" 0.059-0.067" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-49; NASM35333 -
1321FA00018 Cadmium-Plated Steel 1/2" 0.512" 0.9" 0.037-0.045" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-44; NASM35333 -
1321FA00014 Cadmium-Plated Steel 1/4" 0.256" 0.478" 0.023-0.028" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-40; NASM35333 -
1321FA00020 Cadmium-Plated Steel 3/4" 0.769" 1.245" 0.047-0.055" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-47; NASM35333 -
1321FA00016 Cadmium-Plated Steel 3/8" 0.384" 0.692" 0.032-0.040" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-42; NASM35333 -
1321FA00015 Cadmium-Plated Steel 5/16" 0.332" 0.61" 0.028-0.034" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-41; NASM35333 -
1321FA00019 Cadmium-Plated Steel 5/8" 0.64" 1.071" 0.042-0.050" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-46; NASM35333 -
1321FA00017 Cadmium-Plated Steel 7/16" 0.448" 0.789" 0.032-0.040" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-43; NASM35333 -
1321FA00021 Cadmium-Plated Steel 7/8" 0.894" 1.41" 0.052-0.060" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-48; NASM35333 -
1321FA00013 Cadmium-Plated Steel No. 10 0.195" 0.381" 0.020-0.025" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-39; NASM35333 -
1321FA00009 Cadmium-Plated Steel No. 2 0.089" 0.2" 0.010-0.015" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-35; NASM35333 -
1321FA00010 Cadmium-Plated Steel No. 4 0.115" 0.27" 0.015-0.019" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-36; NASM35333 -
1321FA00011 Cadmium-Plated Steel No. 6 0.141" 0.295" 0.017-0.021" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-37; NASM35333 -
1321FA00012 Cadmium-Plated Steel No. 8 0.168" 0.34" 0.018-0.023" Tooth Lock Rockwell C40-50 ASME B18.21.1; MS35333-38; NASM35333 -
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