Flat washers are used under bolt heads or nuts to increase the bearing area or offer greater hardness, so that the nut or bolt can be rotated without distortion of the bearing surface.

USS flat washers have a larger outer diameter than SAE flat washers.
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USS FLAT WASHER (USA), THRU HARDENED, ZINC CR+3 (INCH)

1/4 USS FLAT WASHER GRADE 8 ZINC PLATED DOMESTIC
Web Price $330.75
USS FLAT WASHER (USA), THRU HARDENED, ZINC CR+3 (INCH)

1/4 USS FLAT WASHER GRADE 8 ZINC PLATED DOMESTIC
Web Price $9.40
USS FLAT WASHER (USA), THRU HARDENED, ZINC CR+3 (INCH)

5/16 USS FLAT WASHER GRADE 8 ZINC PLATED DOMESTIC
Web Price QUOTE
USS FLAT WASHER (USA), THRU HARDENED, ZINC CR+3 (INCH)

5/16 USS FLAT WASHER GRADE 8 ZINC PLATED DOMESTIC
Web Price $14.62
USS FLAT WASHER (USA), THRU HARDENED, ZINC CR+3 (INCH)

3/8 USS FLAT WASHER GRADE 8 ZINC PLATED DOMESTIC
Web Price $299.80
Diameter N/A 1/4 N/A 1/4 N/A 5/16 N/A 5/16 N/A 3/8
Length N/A
Material N/A Grade 8
Finish N/A Zinc Plated
Package Quantity N/A 6000 N/A 100 N/A 3500 N/A 100 N/A 3000