Keps nut

"K-lock nut" redirects here. For k-nut, see jet nut.

A Keps nut, (also called a k-lock nut^[1] or washer nut), is a nut with an attached, free-spinning washer.

Keps nuts

It is used to make assembly more convenient. Common washer types are star-type lock washers, conical, and flat washers.^[1]

'Keps' trademark

Keps is a trademark of ITW Shakeproof. The name comes from "kep" in ShaKEProof, and the "s" is because usually more than one are purchased.^[2]