(under subclass 87) Subject matter wherein the nut is provided with openings structured to cooperate with an element used to secure the nut to a fastened position.
(1) Note. The openings on the nut usually take the form of slots cut or formed laterally through the nut to allow a cotter pin to be passed through the nut and cooperating lateral hole in the end of bolt to secure the nut in a locked position.
