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 5990-00-304-7038
NSN 5998-01-323-5244
NSN 6620-01-443-3526
NSN 5990-01-579-2711
NSN 6145-00-521-0001
NSN 6220-01-451-3056
NSN 5855-01-509-6872
NSN 6650-01-305-0027
NSN 5910-01-344-5556
NSN 6320-00-636-0922
NSN 7035-01-082-0311
NSN 6135-00-575-8942