Flat washers distribute the load of a fastener over a wider surface area, helping protect the material and prevent damage as the fastener is tightened.

Nominal Size: 1/2"
Inside Diameter: 9/16"
Outside Diameter: 1-3/8"
Thickness: 7/64"
Material: Steel
Finish: Yellow Zinc
Thread Type: USS
Hardness: Grade 8
Type: Flat Washer
A flat washer is a thin, usually round, plate with a hole in the middle that is normally used to distribute the load of a threaded fastener. USS flat washers have a large, wider body. SAE flat washers are machined to a tighter specification and have a smaller outside diameter.