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USS Flat Washers
Dimensions of USS - ANSI B18.21.1 Flat Washer Type A Wide
SIZE
ID (A)
OD (B)
THICKNESS (C)
Basic
Max
Min
3/16
0.188
0.250
0.265
0.245
0.562
0.577
0.557
0.047
0.065
0.036
1/4
0.312
0.327
0.307
0.734
0.749
0.727
0.080
0.051
5/16
0.375
0.390
0.370
0.875
0.905
0.868
0.083
0.104
0.064
3/8
0.438
0.453
0.433
1.000
1.030
0.993
7/16
0.500
0.515
0.495
1.250
1.280
1.243
1/2
1.375
1.405
1.368
0.109
0.132
0.086
9/16
0.625
0.640
0.620
1.469
1.499
1.462
5/8
0.688
0.718
0.681
1.750
1.780
1.743
0.134
0.160
0.108
3/4
0.750
0.812
0.842
0.805
2.000
2.030
1.993
0.148
0.177
0.122
7/8
0.938
0.968
0.931
2.250
2.280
2.243
0.165
0.019
0.136
1
1.062
1.092
1.055
2.500
2.530
2.493
0.192
1 1/8
1.125
2.750
2.780
2.743
1 1/4
3.000
3.030
2.993
1 3/8
1.500
1.545
1.490
3.250
3.295
3.240
0.180
0.213
0.153
1 1/2
1.625
1.670
1.615
3.500
3.545
3.490
1 5/8
1.795
1.740
3.750
3.795
3.740
1 3/4
1.875
1.920
1.862
4.000
4.045
3.990
1 7/8
2.045
1.990
4.250
4.295
4.240
2
2.125
2.170
2.115
4.500
4.545
4.490
2 1/4
2.375
2.420
2.365
4.750
4.795
4.740
0.220
0.248
0.193
2 1/2
2.625
2.670
2.615
5.000
5.045
4.990
0.238
0.280
0.210
2 3/4
2.875
2.940
2.865
5.250
5.315
5.240
0.259
0.310
0.228
3
3.125
3.190
3.115
5.500
5.565
5.490
0.284
0.249
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