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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 |