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 6620-00-526-7917
NSN 6145-00-420-6491
NSN 4140-00-557-7001
NSN 6610-01-276-7766
NSN 6150-00-268-3659
NSN 6620-01-032-3937
NSN 5895-01-569-4457
NSN 5835-01-522-9881
NSN 5895-00-954-2865
NSN 6240-01-107-4079
NSN 6620-00-022-8056
NSN 6130-01-415-1423