Mil. Spec. Split Lock Washers

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Mil. Spec. Split Lock Washers

Mil. Spec. Split 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 1/2" 1 1/4" 1 1/8" 1 3/8" 1" 1/2" 1/4" 3/4" 3/8" 5/16" 5/8" 7/16" 7/8" 9/16" No. 10 No. 2 No. 4 No. 6 No. 8
Specifications Met
ASME B18.21.1; MS35338-134 ASME B18.21.1; MS35338-135 ASME B18.21.1; MS35338-136 ASME B18.21.1; MS35338-137 ASME B18.21.1; MS35338-138 ASME B18.21.1; MS35338-139 ASME B18.21.1; MS35338-140 ASME B18.21.1; MS35338-141 ASME B18.21.1; MS35338-142 ASME B18.21.1; MS35338-143 ASME B18.21.1; MS35338-144 ASME B18.21.1; MS35338-145 ASME B18.21.1; MS35338-146 ASME B18.21.1; MS35338-148 ASME B18.21.1; MS35338-149 ASME B18.21.1; MS35338-150 ASME B18.21.1; MS35338-39 ASME B18.21.1; MS35338-40 ASME B18.21.1; MS35338-41 ASME B18.21.1; MS35338-42 ASME B18.21.1; MS35338-43 ASME B18.21.1; MS35338-44 ASME B18.21.1; MS35338-45 ASME B18.21.1; MS35338-46 ASME B18.21.1; MS35338-47 ASME B18.21.1; MS35338-48 ASME B18.21.1; MS35338-49 ASME B18.21.1; MS35338-50 ASME B18.21.1; MS35338-51 ASME B18.21.1; MS35338-52 ASME B18.21.1; MS35338-53 ASME B18.21.1; MS35338-54 ASME B18.21.1; MS35338-55 ASME B18.21.1; MS35338-56 ASME B18.21.1; MS35338-57
ID
0.088" 0.114" 0.141" 0.167" 0.193" 0.252" 0.314" 0.377" 0.44" 0.502" 0.564" 0.628" 0.753" 0.878" 1.003" 1.129" 1.254" 1.379" 1.504"
OD
0.172" 0.209" 0.25" 0.293" 0.334" 0.487" 0.583" 0.68" 0.776" 0.869" 0.965" 1.073" 1.265" 1.459" 1.656" 1.847" 2.036" 2.219" 2.419"
Material
Black-Oxide 18-8 Stainless Steel Black-Oxide 316 Stainless Steel Cadmium-Plated Steel Passivated 18-8 Stainless Steel Passivated 316 Stainless Steel Zinc Yellow-Chromate Plated Steel
Thickness
0.020" 0.025" 0.031" 0.040" 0.047" 0.062" 0.078" 0.094" 0.109" 0.125" 0.141" 0.156" 0.188" 0.219" 0.25" 0.281" 0.312" 0.344" 0.375"
Part Number Material For Screw Size ID OD Thickness Washer Type Hardness Specifications Met Fastener Strength Grade/Class
1309FA00044 Black-Oxide 18-8 Stainless Steel 1/2" 0.502" 0.869" 0.125" Split Lock Rockwell C35 ASME B18.21.1; MS35338-143 -
1309FA00042 Black-Oxide 18-8 Stainless Steel 3/8" 0.377" 0.68" 0.094" Split Lock Rockwell C35 ASME B18.21.1; MS35338-141 -
1309FA00041 Black-Oxide 18-8 Stainless Steel 5/16" 0.314" 0.583" 0.078" Split Lock Rockwell C35 ASME B18.21.1; MS35338-140 -
1309FA00046 Black-Oxide 18-8 Stainless Steel 5/8" 0.628" 1.073" 0.156" Split Lock Rockwell C35 ASME B18.21.1; MS35338-145 -
1309FA00043 Black-Oxide 18-8 Stainless Steel 7/16" 0.44" 0.776" 0.109" Split Lock Rockwell C35 ASME B18.21.1; MS35338-142 -
1309FA00045 Black-Oxide 18-8 Stainless Steel 9/16" 0.564" 0.965" 0.141" Split Lock Rockwell C35 ASME B18.21.1; MS35338-144 -
1309FA00064 Black-Oxide 316 Stainless Steel 1/2" 0.502" 0.869" 0.125" Split Lock Rockwell C35 ASME B18.21.1; MS35338-143 -
1309FA00040 Black-Oxide 316 Stainless Steel 1/4" 0.252" 0.487" 0.062" Split Lock Rockwell C35 ASME B18.21.1; MS35338-139 -
1309FA00065 Black-Oxide 316 Stainless Steel 3/4" 0.753" 1.265" 0.188" Split Lock Rockwell C35 ASME B18.21.1; MS35338-146 -
1309FA00063 Black-Oxide 316 Stainless Steel 3/8" 0.377" 0.68" 0.094" Split Lock Rockwell C35 ASME B18.21.1; MS35338-141 -
1309FA00039 Black-Oxide 316 Stainless Steel No. 10 0.193" 0.334" 0.047" Split Lock Rockwell C35 ASME B18.21.1; MS35338-138 -
1309FA00035 Black-Oxide 316 Stainless Steel No. 2 0.088" 0.172" 0.020" Split Lock Rockwell C35 ASME B18.21.1; MS35338-134 -
1309FA00036 Black-Oxide 316 Stainless Steel No. 4 0.114" 0.209" 0.025" Split Lock Rockwell C35 ASME B18.21.1; MS35338-135 -
1309FA00037 Black-Oxide 316 Stainless Steel No. 6 0.141" 0.25" 0.031" Split Lock Rockwell C35 ASME B18.21.1; MS35338-136 -
1309FA00038 Black-Oxide 316 Stainless Steel No. 8 0.167" 0.293" 0.040" Split Lock Rockwell C35 ASME B18.21.1; MS35338-137 -
1309FA00056 Cadmium-Plated Steel 1/2" 0.502" 0.869" 0.125" Split Lock Rockwell C38 ASME B18.21.1; MS35338-48 -
1309FA00052 Cadmium-Plated Steel 1/4" 0.252" 0.487" 0.062" Split Lock Rockwell C38 ASME B18.21.1; MS35338-44 -
1309FA00054 Cadmium-Plated Steel 3/8" 0.377" 0.68" 0.094" Split Lock Rockwell C38 ASME B18.21.1; MS35338-46 -
1309FA00053 Cadmium-Plated Steel 5/16" 0.314" 0.583" 0.078" Split Lock Rockwell C38 ASME B18.21.1; MS35338-45 -
1309FA00067 Cadmium-Plated Steel 5/8" 0.628" 1.073" 0.156" Split Lock Rockwell C38 ASME B18.21.1; MS35338-50 -
1309FA00055 Cadmium-Plated Steel 7/16" 0.44" 0.776" 0.109" Split Lock Rockwell C38 ASME B18.21.1; MS35338-47 -
1309FA00057 Cadmium-Plated Steel 9/16" 0.564" 0.965" 0.141" Split Lock Rockwell C38 ASME B18.21.1; MS35338-49 -
1309FA00051 Cadmium-Plated Steel No. 10 0.193" 0.334" 0.047" Split Lock Rockwell C38 ASME B18.21.1; MS35338-43 -
1309FA00047 Cadmium-Plated Steel No. 2 0.088" 0.172" 0.020" Split Lock Rockwell C38 ASME B18.21.1; MS35338-39 -
1309FA00048 Cadmium-Plated Steel No. 4 0.114" 0.209" 0.025" Split Lock Rockwell C38 ASME B18.21.1; MS35338-40 -
1309FA00049 Cadmium-Plated Steel No. 6 0.141" 0.25" 0.031" Split Lock Rockwell C38 ASME B18.21.1; MS35338-41 -
1309FA00050 Cadmium-Plated Steel No. 8 0.167" 0.293" 0.040" Split Lock Rockwell C38 ASME B18.21.1; MS35338-42 -
1309FA00016 Passivated 18-8 Stainless Steel 1 1/4" 1.254" 2.036" 0.312" Split Lock Rockwell C35 ASME B18.21.1; MS35338-150 -
1309FA00015 Passivated 18-8 Stainless Steel 1 1/8" 1.129" 1.847" 0.281" Split Lock Rockwell C35 ASME B18.21.1; MS35338-149 -
1309FA00014 Passivated 18-8 Stainless Steel 1" 1.003" 1.656" 0.25" Split Lock Rockwell C35 ASME B18.21.1; MS35338-148 -
1309FA00009 Passivated 18-8 Stainless Steel 1/2" 0.502" 0.869" 0.125" Split Lock Rockwell C35 ASME B18.21.1; MS35338-143 -
1309FA00011 Passivated 18-8 Stainless Steel 3/4" 0.753" 1.265" 0.188" Split Lock Rockwell C35 ASME B18.21.1; MS35338-146 -
1309FA00008 Passivated 18-8 Stainless Steel 3/8" 0.377" 0.68" 0.094" Split Lock Rockwell C35 ASME B18.21.1; MS35338-141 -
1309FA00007 Passivated 18-8 Stainless Steel 5/16" 0.314" 0.583" 0.078" Split Lock Rockwell C35 ASME B18.21.1; MS35338-140 -
1309FA00010 Passivated 18-8 Stainless Steel 5/8" 0.628" 1.073" 0.156" Split Lock Rockwell C35 ASME B18.21.1; MS35338-145 -
1309FA00012 Passivated 18-8 Stainless Steel 7/16" 0.44" 0.776" 0.109" Split Lock Rockwell C35 ASME B18.21.1; MS35338-142 -
1309FA00013 Passivated 18-8 Stainless Steel 9/16" 0.564" 0.965" 0.141" Split Lock Rockwell C35 ASME B18.21.1; MS35338-144 -
1309FA00060 Passivated 316 Stainless Steel 1/2" 0.502" 0.869" 0.125" Split Lock Rockwell C35 ASME B18.21.1; MS35338-143 -
1309FA00006 Passivated 316 Stainless Steel 1/4" 0.252" 0.487" 0.062" Split Lock Rockwell C35 ASME B18.21.1; MS35338-139 -
1309FA00062 Passivated 316 Stainless Steel 3/4" 0.753" 1.265" 0.188" Split Lock Rockwell C35 ASME B18.21.1; MS35338-146 -
1309FA00059 Passivated 316 Stainless Steel 3/8" 0.377" 0.68" 0.094" Split Lock Rockwell C35 ASME B18.21.1; MS35338-141 -
1309FA00058 Passivated 316 Stainless Steel 5/16" 0.314" 0.583" 0.078" Split Lock Rockwell C35 ASME B18.21.1; MS35338-140 -
1309FA00061 Passivated 316 Stainless Steel 5/8" 0.628" 1.073" 0.156" Split Lock Rockwell C35 ASME B18.21.1; MS35338-145 -
1309FA00005 Passivated 316 Stainless Steel No. 10 0.193" 0.334" 0.047" Split Lock Rockwell C35 ASME B18.21.1; MS35338-138 -
1309FA00001 Passivated 316 Stainless Steel No. 2 0.088" 0.172" 0.020" Split Lock Rockwell C35 ASME B18.21.1; MS35338-134 -
1309FA00002 Passivated 316 Stainless Steel No. 4 0.114" 0.209" 0.025" Split Lock Rockwell C35 ASME B18.21.1; MS35338-135 -
1309FA00003 Passivated 316 Stainless Steel No. 6 0.141" 0.25" 0.031" Split Lock Rockwell C35 ASME B18.21.1; MS35338-136 -
1309FA00004 Passivated 316 Stainless Steel No. 8 0.167" 0.293" 0.040" Split Lock Rockwell C35 ASME B18.21.1; MS35338-137 -
1309FA00034 Zinc Yellow-Chromate Plated Steel 1 1/2" 1.504" 2.419" 0.375" Split Lock Rockwell C38 ASME B18.21.1; MS35338-57 -
1309FA00032 Zinc Yellow-Chromate Plated Steel 1 1/4" 1.254" 2.036" 0.312" Split Lock Rockwell C38 ASME B18.21.1; MS35338-55 -
1309FA00031 Zinc Yellow-Chromate Plated Steel 1 1/8" 1.129" 1.847" 0.281" Split Lock Rockwell C38 ASME B18.21.1; MS35338-54 -
1309FA00033 Zinc Yellow-Chromate Plated Steel 1 3/8" 1.379" 2.219" 0.344" Split Lock Rockwell C38 ASME B18.21.1; MS35338-56 -
1309FA00030 Zinc Yellow-Chromate Plated Steel 1" 1.003" 1.656" 0.25" Split Lock Rockwell C38 ASME B18.21.1; MS35338-53 -
1309FA00026 Zinc Yellow-Chromate Plated Steel 1/2" 0.502" 0.869" 0.125" Split Lock Rockwell C38 ASME B18.21.1; MS35338-48 -
1309FA00022 Zinc Yellow-Chromate Plated Steel 1/4" 0.252" 0.487" 0.062" Split Lock Rockwell C38 ASME B18.21.1; MS35338-44 -
1309FA00066 Zinc Yellow-Chromate Plated Steel 3/4" 0.753" 1.265" 0.188" Split Lock Rockwell C38 ASME B18.21.1; MS35338-51 -
1309FA00024 Zinc Yellow-Chromate Plated Steel 3/8" 0.377" 0.68" 0.094" Split Lock Rockwell C38 ASME B18.21.1; MS35338-46 -
1309FA00023 Zinc Yellow-Chromate Plated Steel 5/16" 0.314" 0.583" 0.078" Split Lock Rockwell C38 ASME B18.21.1; MS35338-45 -
1309FA00028 Zinc Yellow-Chromate Plated Steel 5/8" 0.628" 1.073" 0.156" Split Lock Rockwell C38 ASME B18.21.1; MS35338-50 -
1309FA00025 Zinc Yellow-Chromate Plated Steel 7/16" 0.44" 0.776" 0.109" Split Lock Rockwell C38 ASME B18.21.1; MS35338-47 -
1309FA00029 Zinc Yellow-Chromate Plated Steel 7/8" 0.878" 1.459" 0.219" Split Lock Rockwell C38 ASME B18.21.1; MS35338-52 -
1309FA00027 Zinc Yellow-Chromate Plated Steel 9/16" 0.564" 0.965" 0.141" Split Lock Rockwell C38 ASME B18.21.1; MS35338-49 -
1309FA00021 Zinc Yellow-Chromate Plated Steel No. 10 0.193" 0.334" 0.047" Split Lock Rockwell C38 ASME B18.21.1; MS35338-43 -
1309FA00017 Zinc Yellow-Chromate Plated Steel No. 2 0.088" 0.172" 0.020" Split Lock Rockwell C38 ASME B18.21.1; MS35338-39 -
1309FA00018 Zinc Yellow-Chromate Plated Steel No. 4 0.114" 0.209" 0.025" Split Lock Rockwell C38 ASME B18.21.1; MS35338-40 -
1309FA00019 Zinc Yellow-Chromate Plated Steel No. 6 0.141" 0.25" 0.031" Split Lock Rockwell C38 ASME B18.21.1; MS35338-41 -
1309FA00020 Zinc Yellow-Chromate Plated Steel No. 8 0.167" 0.293" 0.040" Split Lock Rockwell C38 ASME B18.21.1; MS35338-42 -
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