Cover oversized holes and the ends of tubes and pipe with these cup-shaped washers.

Flat and oval head screws sit flush within these washers for a neat, finished appearance.

Plastic washers are good electrical insulators.

These washers have a flat bottom and high walls to protect metal screw heads from electrical current.

To keep 90° countersunk screws from loosening in vibration applications, the teeth on these washers bite further into the screw head and joint than standard external-tooth lock washers for a more secure hold.