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 6650-00-922-3328
NSN 6645-01-658-5624
NSN 6130-00-396-1118
NSN 7035-01-496-3563
NSN 6645-01-519-2220
NSN 6650-01-646-1643
NSN 6145-01-542-1222
NSN 5910-01-600-2613
NSN 6220-01-461-0304
NSN 6610-01-433-2219
NSN 5920-01-646-1676
NSN 5935-01-608-5461