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 6650-01-258-5871
NSN 5855-01-369-5037
NSN 6220-01-519-9305
NSN 5985-00-804-7897
NSN 7035-00-803-3056
NSN 5999-01-261-6757
NSN 6645-01-557-8134
NSN 5999-00-492-2922
NSN 5895-01-452-6232
NSN 5855-01-551-7923
NSN 5905-01-507-5412
NSN 6650-00-890-0480