Keps nuts, also known as K-Lock nuts or washer nuts, have an integral washer with external teeth. These teeth are designed to bite into the mating surface to provide a locking feature, helping to prevent the nut from loosening under vibrations.

Keps nuts are commonly used in applications where a secure and vibration-resistant connection is essential. The washer-like element eliminates the need for a separate washer and can provide additional stability.