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, THRU HARDENED, ZINC YELLOW CR+6 (IMPORT) (INCH)

1/4 USS FLAT WASHER GRADE 8 YELLOW ZINC PLATED
Web Price $255.94
USS FLAT WASHER, THRU HARDENED, ZINC YELLOW CR+6 (IMPORT) (INCH)

1/4 USS FLAT WASHER GRADE 8 YELLOW ZINC PLATED
Web Price $8.43
USS FLAT WASHER, THRU HARDENED, ZINC YELLOW CR+6 (IMPORT) (INCH)

5/16 USS FLAT WASHER GRADE 8 YELLOW ZINC PLATED
Web Price $247.38
USS FLAT WASHER, THRU HARDENED, ZINC YELLOW CR+6 (IMPORT) (INCH)

5/16 USS FLAT WASHER GRADE 8 YELLOW ZINC PLATED
Web Price $12.26
USS FLAT WASHER, THRU HARDENED, ZINC YELLOW CR+6 (IMPORT) (INCH)

3/8 USS FLAT WASHER GRADE 8 YELLOW ZINC PLATED
Web Price $230.42
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 Yellow Zinc Plated
Package Quantity N/A 6000 N/A 100 N/A 4000 N/A 100 N/A 3000