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Mil. Spec. Washers
Choose these washers for their adherence to strict military standards for material and construction.
18-8 stainless steel and 321 stainless steel washers have excellent corrosion resistance in most environments. They may be mildly magnetic. Passivated 18-8 stainless steel washers have added protection against oxidation and corrosion. Black-oxide 18-8 stainless steel washers have a matte-black finish.
Cadmium- and zinc yellow-chromate plated steel washers are corrosion resistant in wet environments.
Aluminum washers are lightweight and have good corrosion resistance. 1100 aluminum washers are made of an aluminum that is commercially pure, so they have excellent corrosion resistance and electrical conductivity. However, they’re not as strong as 2024 aluminum. They are commonly used in the chemical and food processing industry. 2024 aluminum washers are easy to machine. They are stronger and resist wear better than 1100 aluminum. They are commonly used in the aircraft industry and in veterinary and orthopedic equipment. Yellow-chromate plated 2024 aluminum washers are more corrosion resistant than 2024 aluminum with no finish.
Copper and brass washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive. Because of the finish, cadmium-plated copper washers resist corrosion better than copper washers with no finish. Black-oxide brass washers have a matte-black finish. Tin-plated brass washers have a decorative finish that protects the brass and prevents oxidation.
Nickel copper washers (also known as Monel) are more corrosion resistant than stainless steel. They have excellent resistance to salt water and some acids.
For technical drawings and 3-D models, click on a part number.
| For Screw Size  | ID | OD | Thick. | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Passivated 18-8 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
MS15795/NASM15795 | ||||||||
| No. 1 | 0.078" | 0.188" | 0.016"-0.025" | Rockwell B70 | MS15795-801; NASM15795 | 500 | 000000000 | 000000 |
| No. 2 | 0.094" | 0.250" | 0.016"-0.025" | Rockwell B70 | MS15795-802; NASM15795; ASME B18.21.1 | 500 | 000000000 | 00000 |
| No. 4 | 0.125" | 0.250" | 0.017"-0.028" | Rockwell B70 | MS15795-803; NASM15795 | 500 | 000000000 | 00000 |
| No. 4 | 0.125" | 0.312" | 0.025"-0.040" | Rockwell B70 | MS15795-804; NASM15795; ASME B18.21.1 | 500 | 000000000 | 00000 |
| No. 6 | 0.156" | 0.312" | 0.027"-0.048" | Rockwell B70 | MS15795-805; NASM15795 | 250 | 000000000 | 00000 |
| No. 6 | 0.156" | 0.375" | 0.036"-0.065" | Rockwell B70 | MS15795-806; NASM15795; ASME B18.21.1 | 250 | 000000000 | 00000 |
| No. 8 | 0.188" | 0.375" | 0.036"-0.065" | Rockwell B70 | MS15795-807; NASM15795 | 250 | 000000000 | 00000 |
| No. 8 | 0.188" | 0.438" | 0.036"-0.065" | Rockwell B70 | MS15795-841; NASM15795; ASME B18.21.1 | 125 | 000000000 | 00000 |
| No. 10 | 0.219" | 0.438" | 0.036"-0.065" | Rockwell B70 | MS15795-808; NASM15795 | 250 | 000000000 | 00000 |
| No. 10 | 0.219" | 0.500" | 0.036"-0.065" | Rockwell B70 | MS15795-842; NASM15795; ASME B18.21.1 | 100 | 000000000 | 00000 |
| No. 12 | 0.250" | 0.562" | 0.051"-0.080" | Rockwell B70 | MS15795-809; NASM15795; ASME B18.21.1 | 100 | 000000000 | 00000 |
| 1/4" | 0.281" | 0.625" | 0.051"-0.080" | Rockwell B70 | MS15795-810; NASM15795; ASME B18.21.1 | 50 | 000000000 | 00000 |
| 1/4" | 0.312" | 0.734" | 0.051"-0.080" | Rockwell B70 | MS15795-811; NASM15795; ASME B18.21.1 | 25 | 000000000 | 00000 |
| 5/16" | 0.344" | 0.688" | 0.051"-0.080" | Rockwell B70 | MS15795-812; NASM15795; ASME B18.21.1 | 25 | 000000000 | 00000 |
| 5/16" | 0.375" | 0.875" | 0.064"-0.104" | Rockwell B70 | MS15795-813; NASM15795 | 25 | 000000000 | 00000 |
| 3/8" | 0.406" | 0.812" | 0.051"-0.080" | Rockwell B70 | MS15795-814; NASM15795; ASME B18.21.1 | 50 | 000000000 | 00000 |
| 3/8" | 0.438" | 1.000" | 0.064"-0.104" | Rockwell B70 | MS15795-815; NASM15795; ASME B18.21.1 | 10 | 000000000 | 00000 |
| 7/16" | 0.469" | 0.922" | 0.051"-0.080" | Rockwell B70 | MS15795-816; NASM15795; ASME B18.21.1 | 25 | 000000000 | 00000 |
| 7/16" | 0.500" | 1.250" | 0.064"-0.104" | Rockwell B70 | MS15795-817; NASM15795; ASME B18.21.1 | 10 | 000000000 | 00000 |
| 1/2" | 0.531" | 1.062" | 0.074"-0.121" | Rockwell B70 | MS15795-818; NASM15795; ASME B18.21.1 | 10 | 000000000 | 00000 |
| 1/2" | 0.562" | 1.375" | 0.086"-0.132" | Rockwell B70 | MS15795-819; NASM15795; ASME B18.21.1 | 10 | 000000000 | 00000 |
| 5/8" | 0.656" | 1.312" | 0.074"-0.121" | Rockwell B70 | MS15795-820; NASM15795; ASME B18.21.1 | 10 | 000000000 | 00000 |
| 5/8" | 0.688" | 1.750" | 0.108"-0.160" | Rockwell B70 | MS15795-821; NASM15795; ASME B18.21.1 | 5 | 000000000 | 00000 |
| 3/4" | 0.812" | 1.469" | 0.108"-0.160" | Rockwell B70 | MS15795-822; NASM15795; ASME B18.21.1 | 5 | 000000000 | 00000 |
| 3/4" | 0.812" | 2.000" | 0.122"-0.177" | Rockwell B70 | MS15795-823; NASM15795; ASME B18.21.1 | 5 | 000000000 | 00000 |
| 7/8" | 0.938" | 1.750" | 0.108"-0.160" | Rockwell B70 | MS15795-824; NASM15795; ASME B18.21.1 | 5 | 000000000 | 00000 |
| 7/8" | 0.938" | 2.250" | 0.136"-0.192" | Rockwell B70 | MS15795-825; NASM15795; ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1" | 1.062" | 2.000" | 0.108"-0.160" | Rockwell B70 | MS15795-826; NASM15795; ASME B18.21.1 | 1 | 000000000 | 0000 |
| 1" | 1.062" | 2.500" | 0.136"-0.192" | Rockwell B70 | MS15795-827; NASM15795; ASME B18.21.1 | 1 | 000000000 | 0000 |
MS14151 | ||||||||
| No. 5 | 0.154" | 0.490" | 0.017"-0.023" | Rockwell B68 | MS14151-1 | 100 | 000000000 | 00000 |
| No. 6 | 0.187" | 0.560" | 0.017"-0.023" | Rockwell B68 | MS14151-6 | 100 | 000000000 | 00000 |
| No. 8 | 0.209" | 0.620" | 0.017"-0.023" | Rockwell B68 | MS14151-2 | 100 | 000000000 | 00000 |
| 1/4" | 0.275" | 1.090" | 0.017"-0.023" | Rockwell B68 | MS14151-3 | 50 | 000000000 | 00000 |
| 5/16" | 0.338" | 1.090" | 0.017"-0.023" | Rockwell B68 | MS14151-4 | 50 | 000000000 | 00000 |
| 3/8" | 0.400" | 1.090" | 0.017"-0.023" | Rockwell B68 | MS14151-5 | 50 | 000000000 | 00000 |
MS51496 | ||||||||
| No. 0 | 0.068" | 0.130" | 0.022"-0.028" | Rockwell C20 | MS51496-P61 | 25 | 000000000 | 00000 |
| No. 0 | 0.068" | 0.161" | 0.013"-0.019" | Rockwell C20 | MS51496-P62 | 25 | 000000000 | 00000 |
| No. 1 | 0.099" | 0.140" | 0.010"-0.013" | Rockwell C20 | MS51496-P79 | 25 | 000000000 | 00000 |
| No. 1 | 0.099" | 0.161" | 0.022"-0.028" | Rockwell C20 | MS51496-P63 | 25 | 000000000 | 00000 |
| No. 3 | 0.109" | 0.219" | 0.022"-0.028" | Rockwell C20 | MS51496-P64 | 10 | 000000000 | 0000 |
| No. 4 | 0.125" | 0.180" | 0.013"-0.019" | Rockwell C20 | MS51496-P80 | 10 | 000000000 | 0000 |
| No. 4 | 0.125" | 0.180" | 0.029"-0.032" | Rockwell C20 | MS51496-P65 | 10 | 000000000 | 0000 |
| No. 4 | 0.125" | 0.255" | 0.013"-0.019" | Rockwell C20 | MS51496-P66 | 10 | 000000000 | 0000 |
| No. 4 | 0.125" | 0.255" | 0.028"-0.036" | Rockwell C20 | MS51496-P67 | 10 | 000000000 | 0000 |
| No. 6 | 0.156" | 0.284" | 0.013"-0.019" | Rockwell C20 | MS51496-P68 | 10 | 000000000 | 00000 |
| No. 6 | 0.156" | 0.284" | 0.029"-0.035" | Rockwell C20 | MS51496-P69 | 10 | 000000000 | 00000 |
| No. 8 | 0.176" | 0.284" | 0.029"-0.035" | Rockwell C20 | MS51496-P70 | 10 | 000000000 | 00000 |
| No. 8 | 0.199" | 0.315" | 0.029"-0.032" | Rockwell C20 | MS51496-P71 | 10 | 000000000 | 0000 |
| No. 10 | 0.210" | 0.365" | 0.029"-0.032" | Rockwell C20 | MS51496-P73 | 10 | 000000000 | 00000 |
| No. 10 | 0.220" | 0.400" | 0.040"-0.050" | Rockwell C20 | MS51496-P82 | 10 | 000000000 | 00000 |
| 1/4" | 0.270" | 0.460" | 0.029"-0.032" | Rockwell C20 | MS51496-P75 | 10 | 000000000 | 00000 |
| 1/4" | 0.280" | 0.375" | 0.022"-0.028" | Rockwell C20 | MS51496-P84 | 10 | 000000000 | 00000 |
| 1/4" | 0.288" | 0.440" | 0.029"-0.032" | Rockwell C20 | MS51496-P77 | 10 | 000000000 | 00000 |
| 5/16" | 0.317" | 0.525" | 0.029"-0.032" | Rockwell C20 | MS51496-P78 | 5 | 000000000 | 00000 |
| 3/8" | 0.421" | 0.630" | 0.045"-0.055" | Rockwell C20 | MS51496-P85 | 5 | 000000000 | 00000 |
| 5/8" | 0.656" | 1.062" | 0.040"-0.050" | Rockwell C20 | MS51496-P86 | 1 | 000000000 | 0000 |
| 3/4" | 0.813" | 1.125" | 0.013"-0.019" | Rockwell C20 | MS51496-P87 | 1 | 000000000 | 0000 |
MS16212 | ||||||||
| 1/4" | 0.322" | 0.760" | 0.051"-0.080" | Rockwell B68 | MS16212-11 | 50 | 000000000 | 00000 |
| 5/16" | 0.385" | 0.760" | 0.051"-0.080" | Rockwell B68 | MS16212-12 | 50 | 000000000 | 00000 |
| 3/8" | 0.447" | 0.885" | 0.064"-0.104" | Rockwell B68 | MS16212-13 | 25 | 000000000 | 00000 |
| 1/2" | 0.572" | 1.260" | 0.086"-0.132" | Rockwell B68 | MS16212-14 | 10 | 000000000 | 00000 |
| 5/8" | 0.697" | 1.510" | 0.108"-0.160" | Rockwell B68 | MS16212-15 | 5 | 000000000 | 00000 |
| 3/4" | 0.822" | 1.760" | 0.122"-0.177" | Rockwell B68 | MS16212-16 | 5 | 000000000 | 00000 |
NAS1149 | ||||||||
| No. 2 | 0.099" | 0.250" | 0.014"-0.018" | Rockwell C25 | NAS1149-CN216R | 500 | 000000000 | 00000 |
| No. 2 | 0.099" | 0.250" | 0.028"-0.036" | Rockwell B70 | NAS1149-CN232R | 500 | 000000000 | 00000 |
| No. 3 | 0.105" | 0.250" | 0.014"-0.018" | Rockwell C25 | NAS1149-CN316R | 500 | 000000000 | 00000 |
| No. 3 | 0.105" | 0.250" | 0.028"-0.036" | Rockwell B70 | NAS1149-CN332R | 500 | 000000000 | 00000 |
| No. 4 | 0.125" | 0.312" | 0.014"-0.018" | Rockwell C25 | NAS1149-CN416R | 500 | 000000000 | 00000 |
| No. 4 | 0.125" | 0.312" | 0.028"-0.036" | Rockwell B70 | NAS1149-CN432R; ASME B18.21.1 | 500 | 000000000 | 00000 |
| No. 6 | 0.149" | 0.375" | 0.014"-0.018" | Rockwell C25 | NAS1149-CN616R | 500 | 000000000 | 00000 |
| No. 6 | 0.149" | 0.375" | 0.028"-0.036" | Rockwell B70 | NAS1149-CN632R | 500 | 000000000 | 00000 |
| No. 8 | 0.174" | 0.375" | 0.014"-0.018" | Rockwell C25 | NAS1149-CN816R | 500 | 000000000 | 00000 |
| No. 8 | 0.174" | 0.375" | 0.028"-0.036" | Rockwell B70 | NAS1149-CN832R | 500 | 000000000 | 00000 |
| No. 10 | 0.203" | 0.438" | 0.028"-0.036" | Rockwell B70 | NAS1149-C0332R | 250 | 000000000 | 00000 |
| No. 10 | 0.203" | 0.438" | 0.057"-0.069" | Rockwell B70 | NAS1149-C0363R | 250 | 000000000 | 00000 |
| 1/4" | 0.265" | 0.500" | 0.028"-0.036" | Rockwell B70 | NAS1149-C0432R | 250 | 000000000 | 00000 |
| 1/4" | 0.265" | 0.500" | 0.057"-0.069" | Rockwell B70 | NAS1149-C0463R | 100 | 000000000 | 00000 |
| 5/16" | 0.328" | 0.562" | 0.028"-0.036" | Rockwell B70 | NAS1149-C0532R | 100 | 000000000 | 00000 |
| 5/16" | 0.328" | 0.562" | 0.057"-0.069" | Rockwell B70 | NAS1149-C0563R | 100 | 000000000 | 00000 |
| 3/8" | 0.390" | 0.625" | 0.028"-0.036" | Rockwell B70 | NAS1149-C0632R | 100 | 000000000 | 00000 |
| 3/8" | 0.390" | 0.625" | 0.057"-0.069" | Rockwell B70 | NAS1149-C0663R | 100 | 000000000 | 00000 |
| 7/16" | 0.453" | 0.750" | 0.028"-0.036" | Rockwell B70 | NAS1149-C0732R | 100 | 000000000 | 00000 |