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 5990-01-184-2550
NSN 6135-00-377-9165
NSN 5855-01-096-0872
NSN 6645-01-203-7398
NSN 5999-00-415-1845
NSN 6320-01-067-0474
NSN 6240-01-061-5122
NSN 5905-01-496-0209
NSN 5910-01-067-3909
NSN 5960-01-549-4826
NSN 6650-01-348-5448
NSN 6105-01-435-8017