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A Keps nut, (also called a K-nut or washer nut), is a nut with an attached, free-spinning washer.
It is used to make assembly more convenient. Common washer types are star-type lock washers, conical, and flat washers.
'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.
References
Keps nut Wikipedia(Text) CC BY-SA