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USS Flat Washers Extra Thick

USS Flat Washers Extra Thick


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USS Flat Washers Extra Thick

USS pattern flat washers extra thick are manufactured from medium carbon steel to meet ASTM F844. Zinc plated material will meet or exceed ASTM B633 SC1 Type 2. Hot-Dip Galvanized material will meet or exceed ASTM A153.

USS Flat Washers Extra Thick
Bolt Size Outside Diameter Inside Diameter Thickness Approximate
Number per
50 Pounds
Nominal Max Min Nominal Max Min Max Min
1/4 3/4 0.749 0.727 5/16 0.327 0.307 .080 .064 6600
5/16 7/8 0.905 0.868 3/8 0.390 0.370 .093 .079 4200
3/8 1 1.030 0.993 7/16 0.453 0.433 .093 .079 3250
7/16 1-1/4 1.280 1.243 1/2 0.515 0.495 .106 .090 1750
1/2 1-3/8 1.405 1.368 9/16 0.577 0.557 .146 .122 1100
9/16 1-1/2 1.499 1.462 5/8 0.640 0.620 .146 .122 950
5/8 1-3/4 1.780 1.743 21/32 0.687 0.649 .160 .136 550
3/4 2 2.030 1.993 13/16 0.842 0.805 .160 .136 450
7/8 2-1/4 2.280 2.243 15/16 0.968 0.931 .160 .136 375
1 2-1/2 2.530 2.493 1-1/16 1.092 1.055 .160 .136 300