9/16" x 31/32" Zinc Plated Grade 2 Steel Split Lock Washers

Diameter: 9/16"
Diameter 2: 31/32"
Thickness: 5/32"
Material: Steel
Finish: Zinc
Hardness: Grade 2
Style: Medium Split
Type: Lock Washer
Application: Nuts and Bolts

Box of 20.

The purpose for a lock washer is to prevent threaded fasteners from loosening by creating friction between the fastener and the mounting surface.