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 6645-01-299-3198
NSN 6650-00-118-5600
NSN 6135-01-426-8282
NSN 5999-00-005-7098
NSN 6645-00-409-2168
NSN 6135-01-513-3581
NSN 5996-00-151-4462
NSN 5975-00-510-6815
NSN 5855-01-534-7940
NSN 2925-00-113-6146
NSN 6240-00-146-9322
NSN 6150-00-399-1431