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 6650-01-468-4681
NSN 5905-00-247-9308
NSN 6105-01-224-5813
NSN 5975-00-193-1696
NSN 6620-01-642-7219
NSN 5950-01-253-4300
NSN 4140-01-428-7650
NSN 6110-01-472-1963
NSN 6240-01-177-8954
NSN 6645-00-515-6148
NSN 6645-01-367-2581
NSN 5925-01-072-9189