5/16" x 7/16" Plain Steel High Collar Lock Washers (96 pcs.)

Diameter: 5/16"
Diameter 2: 7/16"
Thickness: 3/32"
Material: Steel
Finish: Plain
Style: High Collar Split
Type: Lock Washer
Application: Confined Areas

Box of 96.

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