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This nut calks a washer to the nut body to prevent it from backing off although it has different usage from that of the lock nut.

In addition to the loosening-proof feature, it has another special function to protect the surface of the object it is screwed into, especially the object with a weak surface such as gilt or resin products.

It is also lighter than the lock nut so that it helps weight minimization of a finished car. It is mostly used to fasten windshield wiper arms, bumper and door hinges.
Hexagon Nuts, With Conical Spring Washer
Hexagon Nuts, With Wave Spring Washer