Features:

The concave MF locknut is a free-spinning, square or hexagon locknut that starts freely from either side, and spins into place with the fingers.  One-half to a full turn with a wrench locks it securely.

When the arched surface contacts the top of the common nut or bearing surface, wrenching flattens the arch, deflecting the nut threads from their true helix and causing them to firmly grip the bolt threads.  The nut takes a permanent set and must be wrenched for further movement.

Material:

• Hot Dip Galvanized