5/16" x 11/16" Zinc Grade 2 External Tooth Lock Washers (100 pcs)

Diameter: 5/16"
Diameter 2: 11/16"
Thickness: 1/16"
Material: Steel
Finish: Zinc
Hardness: Grade 2
Nominal Size: 5/16"
Style: External Tooth
Type: Lock Washer
Application: Round|pan|or binding head

Box of 100.

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