As a screw is tightened, these metric washers flatten to add tension to the joint, counteracting fatigue around the joint from small amounts of vibration.

Compared to standard split lock washers, these are thicker and have larger outside diameters.

Also known as high-collar lock washers, these metric washers have smaller outside diameters than standard split lock washers to fit neatly under socket head cap screws.

As a screw is tightened, these washers flatten to add tension to the joint and prevent loosening from small amounts of vibration.