5/8" x 1-3/32" Zinc Plated Grade 5 Steel Split Lock Washers

Diameter: 5/8"
Diameter 2: 1-3/32"
Thickness: 3/16"
Material: Steel
Finish: Zinc
Hardness: Grade 5
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.