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Alma Bolt Company & Prime Fasteners 1-800-526-2200

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Specifications & Dimensions of USS & SAE Flat Washers

Outside Diameter
Inside Diameter
Thickness
Bolt Size
Nominal
Max
Min
Nominal
Max
Min
AmericanStand. Ga.
Max
Min
Approximate Weight per 50 Pounds
3/16
9/16
0.593
0.531
1/4
0.281
0.250
18 (3/64)
0.065
0.036
18050
1/4
3/4
0.781
0.719
5/16
0.343
0.312
16 (1/16)
0.080
0.051
7450
5/16
7/8
0.906
0.844
3/8
0.406
0.375
14 (5/64)
0.104
0.064
4350
3/8
1
1.031
0.969
7/16
0.469
0.438
14 (5/64)
0.104
0.064
3350
7/16
1 1/4
1.281
1.219
1/2
0.531
0.5
14 (5/64)
0.104
0.064
2050
1/2
1 3/8
1.406
1.344
9/16
0.593
0.562
12 (7/64)
0.132
0.086
1300
9/16
1 1/2
1.531
1.469
5/8
0.656
0.625
12 (7/64)
0.132
0.108
1100
5/8
1 3/4
1.781
1.719
11/16
0.719
0.688
10 (9/64)
0.160
0.122
650
3/4
2
2.031
1.969
13/16
0.843
0.812
9 (5/32)
0.177
0.136
455
7/8
2 1/4
2.281
2.219
15/16
0.969
0.938
8 (11/64)
0.192
0.136
325
1
2 1/2
2.531
2.469
1 1/16
1.094
1.063
8 (11/64)
0.192
0.136
265
1 1/8
2 3/4
2.781
2.719
1 1/4
1.281
1.250
8 (11/64)
0.192
0.136
225
1 1/4
3
3.031
2.969
1 3/8
1.406
1.375
8 (11/64)
0.192
0.136
190
1 3/8
3 1/4
3.281
3.219
1 1/2
1.531
1.500
7 (3/16)
0.192
0.153
150
1 1/2
3 1/2
3.531
3.469
1 5/8
1.656
1.625
7 (3/16)
0.213
0.153
130
1 5/8
3 3/4
3.813
3.687
1 3/4
1.813
1.750
7 (3/16)
0.213
0.153
115
1 3/4
4
4.063
3.937
1 7/8
1.938
1.875
7 (3/16)
0.213
0.153
100
1 7/8
4 1/4
4.313
4.187
2
2.063
2
7 (3/16)
0.213
0.153
90
2
4 1/2
4.563
4.437
2 1/8
2.188
2.125
7 (3/16)
0.213
0.153
79
2 1/4
4 3/4
4.813
4.687
2 3/8
2.438
2.375
5 (7/32)
0.248
0.193
60
2 1/2
5
5.063
4.937
2 5/8
2.688
2.625
4 (15/64)
0.28
0.21
52
2 3/4
5 1/4
5.313
5.187
2 7/8
2.938
2.875
3 (1/4)
0.31
0.228
45
3
5 1/2
5.563
5.437
3 1/8
3.188
3.125
2 (5/32)
0.327
0.249
43

 

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