5/16 x 9/16 Black Chrome Plated Grade 2 Steel AN Washers (12 pcs.)

Diameter: 5/16 Diameter 2: 9/16 Thickness: 1/16 Material: Steel Finish: Black Chrome Thread Type: AN Hardness: Grade 2 Nominal Size: 5/16 Style: AN Type: Flat Washer Box of 12. 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.