A nut, flat on top and bottom having 6 flat sides. For items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see locknut, electrical conduit. See also locknut, tube fitting. For items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)
NSN 5990-00-395-5703
NSN 5999-01-434-7847
NSN 5935-01-578-2356
NSN 5996-01-268-1625
NSN 6610-01-633-8931
NSN 6110-00-530-3779
NSN 6645-00-240-7162
NSN 6685-01-252-9470
NSN 5999-00-613-6907
NSN 5999-01-031-1285
NSN 5985-00-126-6575
NSN 6610-00-684-1666