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 5990-01-574-2522
NSN 6650-00-776-5419
NSN 6620-00-246-5159
NSN 6135-00-377-9165
NSN 5950-01-579-1038
NSN 5835-01-039-9973
NSN 5915-01-182-8133
NSN 5985-00-513-3420
NSN 6685-01-349-0651
NSN 5895-00-919-0684
NSN 5835-01-566-5462
NSN 5920-01-352-3625