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.

A hardened steel structural washer is manufactured in accordance with ASTM Standard F436.
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F436 STRUCTURAL FLAT WASHER, HDG (INCH)

1/4 F436 STRUCTURAL WASHER GALVANIZED
Web Price $292.95
F436 STRUCTURAL FLAT WASHER, HDG (INCH)

5/16 F436 STRUCTURAL WASHER GALVANIZED
Web Price $267.75
F436 STRUCTURAL FLAT WASHER, HDG (INCH)

3/8 F436 STRUCTURAL WASHER GALVANIZED
Web Price $309.25
F436 STRUCTURAL FLAT WASHER, HDG (INCH)

7/16 F436 STRUCTURAL WASHER GALVANIZED
Web Price $246.12
F436 STRUCTURAL FLAT WASHER, HDG (INCH)

1/2 F436 STRUCTURAL WASHER GALVANIZED
Web Price $244.86
Diameter N/A 1/4 N/A 5/16 N/A 3/8 N/A 7/16 N/A 1/2
Length N/A
Material N/A Hardened Steel
Finish N/A Galvanized
Package Quantity N/A 10000 N/A 8000 N/A 7000 N/A 4000 N/A 2000