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 6220-01-020-2550
NSN 6645-01-120-4988
NSN 5985-01-444-8788
NSN 5985-01-562-1921
NSN 6610-01-550-0628
NSN 6135-01-159-9705
NSN 6135-01-628-2903
NSN 5999-01-091-5370
NSN 6610-00-194-0676
NSN 4140-00-760-8920
NSN 6650-00-346-8672
NSN 6685-00-425-7410