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, PLAIN (INCH)

1 USS FLAT WASHER (LBS)
Web Price QUOTE
USS FLAT WASHER, PLAIN (INCH)

1 USS FLAT WASHER
Web Price $34.44
USS FLAT WASHER, PLAIN (INCH)

1 1/8 USS FLAT WASHER (LBS)
Web Price QUOTE
USS FLAT WASHER, PLAIN (INCH)

1 1/8 USS FLAT WASHER
Web Price $47.07
USS FLAT WASHER, PLAIN (INCH)

1 1/4 USS FLAT WASHER (LBS)
Web Price QUOTE
Diameter N/A 1 N/A 1 N/A 1 1/8 N/A 1 1/8 N/A 1 1/4
Length N/A
Material N/A Carbon Steel
Finish N/A Plain
Package Quantity N/A 50 N/A 25 N/A 50 N/A 25 N/A 50