Nominal Size: 1/2"
Inside Diameter: 1/2"
Outside Diameter: 7/8"
Thickness: 5/64"
Material: Stainless Steel
Hardness: 18-8
Style: External Tooth
Type: Lock Washer
Application: Round|pan|or binding head
Diameter 3: 5/8"
Box of 10.
The purpose for a lock washer is to prevent threaded fasteners from loosening by creating friction between the fastener and the mounting surface.