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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.

SAE flat washers are manufactured to specifications of the Society of Automotive Engineers (SAE), and are recommended for use in automotive manufacturing applications.
SAE FLAT WASHER (USA), THRU HARDENED, ZINC CR+3 (INCH)
Unit of Measure
Items SAE FLAT WASHER (USA), THRU HARDENED, ZINC CR+3 (INCH)
25NWSA8Z/DOM
1/4 SAE FLAT WASHER GRADE 8 ZINC PLATED DOMESTIC
Web Price $350.91
SAE FLAT WASHER (USA), THRU HARDENED, ZINC CR+3 (INCH)
25NWSA8Z/DOM
1/4 SAE FLAT WASHER GRADE 8 ZINC PLATED DOMESTIC
Web Price $7.48
SAE FLAT WASHER (USA), THRU HARDENED, ZINC CR+3 (INCH)
31NWSA8Z/DOM
5/16 SAE FLAT WASHER GRADE 8 ZINC PLATED DOMESTIC
Web Price $393.36
SAE FLAT WASHER (USA), THRU HARDENED, ZINC CR+3 (INCH)
31NWSA8Z/DOM
5/16 SAE FLAT WASHER GRADE 8 ZINC PLATED DOMESTIC
Web Price $8.95
SAE FLAT WASHER (USA), THRU HARDENED, ZINC CR+3 (INCH)
37NWSA8Z/DOM
3/8 SAE FLAT WASHER GRADE 8 ZINC PLATED DOMESTIC
Web Price $321.96
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 8000 N/A 100 N/A 7500 N/A 100 N/A 5000