As a screw is tightened, these washers flatten to add tension to the joint, counteracting fatigue around the joint from small amounts of vibration. This makes them a common choice to prevent fasteners from loosening. However, they resist the least amount of vibration compared to other locking washers.

These washers are compatible with fasteners that have right-hand threads to prevent loosening. The uneven split ends bite into fasteners for a tight grip, but they won’t work with hardened surfaces. These washers hold better than curved or wave washers. They are not reusable after tightening.

K500 nickel washers (also known as Monel) have excellent resistance to salt water and some acids. They may be mildly magnetic.

Washers that meet ASME B18.21.1 adhere to strict dimensional standards.

For technical drawings and 3-D models, click on a part number.