Nominal Size: 5/16"
Inside Diameter: 5/16"
Outside Diameter: 45/64"
Thickness: 1/16"
Material: Stainless Steel
Hardness: 18-8
Style: Internal Tooth
Type: Lock Washer
Application: Smaller head screws
Box of 16.
The purpose for a lock washer is to prevent threaded fasteners from loosening by creating friction between the fastener and the mounting surface.
