USS Washers

Bolt Size Outside Diameter Inside Diameter Thickness Approximate Number per 50 Pounds
Nominal Max Min Nominal Max Min American Standard (Gauge) Max Min
3/16 9/16 0.577 0.557 1/4 0.265 0.245 18 (3/64) .065 .036 18050
1/4 3/4 0.749 0.727 5/16 0.327 0.307 16 (1/16) .080 .051 7450
5/16 7/8 0.905 0.868 3/8 0.390 0.370 14 (5/64) .104 .064 4350
3/8 1 1.030 0.993 7/16 0.453 0.433 14 (5/64) .104 .064 3350
7/16 1-1/4 1.280 1.243 1/2 0.515 0.495 14 (5/64) .104 .064 2050
1/2 1-3/8 1.405 1.368 9/16 0.577 0.557 12 (7/64) .132 .086 1300
9/16 1-1/2 1.499 1.462 5/8 0.640 0.620 21 (7/64) .132 .086 1100
5/8 1-3/4 1.780 1.743 11/16 0.718 0.681 10 (9/64) .160 .108 650
3/4 2 2.030 1.993 13/16 0.842 0.805 9 (5/32) .177 .122 455
7/8 2-1/4 2.280 2.243 15/16 0.968 0.931 8 (11/64) .192 .136 325
1 2-1/2 2.530 2.493 1-1/16 1.092 1.055 8 (11/64) .192 .136 265
1-1/8 2-3/4 2.780 2.743 1-1/4 1.280 1.243 8 (11/64) .192 .136 225
1-1/4 3 3.030 2.993 1-3/8 1.405 1.368 8 (11/64) .192 .136 190
1-3/8 3-1/4 3.295 3.240 1-1/2 1.545 1.490 7 (3/16) .213 .153 150
1-1/2 3-1/2 3.545 3.490 1-5/8 1.670 1.615 7 (3/16) .213 .153 130
1-5/8 3-3/4 3.795 3.740 1-3/4 1.795 1.740 7 (3/16) .213 .153 115
1-3/4 4 4.045 3.990 1-7/8 1.920 1.865 7 (3/16) .213 .153 100
1-7/8 4-1/4 4.295 4.240 2 2.045 1.990 7 (3/16) .213 .153 90
2 4-1/2 4.545 4.490 2-1/8 2.170 2.115 7 (3/16) .213 .153 79
2-1/4 4-3/4 4.795 4.740 2-3/8 2.420 2.365 5 (7/32) .248 .193 60
2-1/2 5 5.045 4.990 2-5/8 2.670 2.615 4 (15/64) .280 .210 52
2-3/4 5-1/4 5.315 5.240 2-7/8 2.940 2.865 3 (1/4) .310 .228 45
3 5-1/2 5.565 5.490 3-1/8 3.190 3.115 2 (5/32) .327 .249 43