ASME B18.22.1 Plain Washer Type A USS
Bolt Size, In. 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 Outside Dia., In. 0.734 0.875 1.000 1.250 1.375 1.469 1.750 2.000 2.250 2.500 Inside Dia., In. 0.312 0.375 0.438 0.500 0.562 0.625 0.688 0.812 0.938 1.062 Thickness min 0.065 0.083 0.083 0.083 0.109 0.109 0.134 0.148 0.165 0.165
Bolt Size, In. 1 1/8 1 1/4 1 3/8 1 1/2 1 5/8 1 3/4 1 7/8 2 2 1/4 2 1/2 2 3/4 3 Outside Dia., In. 2.750 3.000 3.250 3.500 3.750 4.000 4.250 4.500 4.750 5 5.25 5.5 Inside Dia., In. 1.250 1.375 1.500 1.625 1.750 1.875 2.000 2.125 2.375 2.625 2.875 3.125 Thickness min 0.165 0.165 0.180 0.180 0.180 0.180 0.180 0.180 0.220 0.238 0.259 0.284