Bend the tab of these metric lock washers against the flats of a hex nut or bolt head to prevent the fastener and washer from turning and loosening due to vibration, wear, or changes in temperature.

Teeth on the outside edge of the washer bite into the screw head and joint for a tight grip.

Choose these washers for their adherence to strict military standards for material and construction.

Internal teeth dig into the screw head while the smooth outside edge won't snag objects. Use with fasteners that have small heads, such as fillister and cheese head screws.

Choose these washers for their adherence to strict military standards for material and construction.

The combination of internal and external teeth boosts gripping power to maintain a tight hold and provide more vibration resistance than other tooth lock washers. Use with fasteners that have heads large enough to make contact with the external teeth, such as pan, button, and binding head screws.

Use the angled edges to hold and align tie-down straps.

Repair sagging, cracked plaster with these washers. The holes allow plaster to flow through to form a secure bond between the washer and the wall.