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USS Flat Washers

USS Flat Washers


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USS Flat Washers

USS pattern flat washers are manufactured from low carbon steel to meet ASTM F844.  Zinc plated material will meet or exceed ASTM F1941.  Hot-Dip Galvanized material will meet or exceed ASTM A153.

USS Flat Washers
 
USS Flat Washers

Bolt

Size

Outside Diameter Inside Diameter

Thickness

Approximate
Number
of STEEL
Washers 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