5/16 x 3/8 x 7/8 Black Chrome Grade 2 USS Flat Washers (10 pcs.)

Diameter: 3/8 Diameter 2: 7/8 Thickness: 5/64 Material: Steel Finish: Black Chrome Thread Type: USS Hardness: Grade 2 Nominal Size: 5/16 Type: Flat Washer Box of 10. 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.