Lock washers add spring tension or bite beneath a fastener head or nut, helping resist loosening from vibration.
Nominal Size: 4mm
Inside Diameter: 4mm
Outside Diameter: 9mm
Thickness: 0.6mm
Material: Steel
Finish: Zinc
Hardness: Class 8
Style: Wave Spring
Type: Lock Washer
Specifications: DIN 137B
The purpose for a lock washer is to prevent threaded fasteners from loosening by creating friction between the fastener and the mounting surface.
