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 6220-00-476-6031
NSN 6320-01-564-0893
NSN 5835-00-602-4750
NSN 6145-01-420-6132
NSN 5945-01-016-0997
NSN 5945-00-804-3421
NSN 5910-00-900-1427
NSN 6135-01-449-2144
NSN 6650-01-111-2036
NSN 5855-01-068-3683
NSN 6645-00-003-0337
NSN 5910-00-456-0824