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 6220-00-907-7572
NSN 5990-01-116-2181
NSN 5990-00-277-3763
NSN 6650-01-314-8454
NSN 5996-01-093-9259
NSN 6685-00-817-5694
NSN 5895-00-424-0850
NSN 5920-00-081-9156
NSN 5935-01-163-7573
NSN 5855-00-560-0110
NSN 5930-01-505-0811
NSN 5905-01-607-4752