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 6650-01-412-1040
NSN 5855-01-386-7323
NSN 5990-01-154-7296
NSN 5925-00-983-0214
NSN 5935-00-914-6686
NSN 6220-01-261-6521
NSN 6105-01-427-8439
NSN 6135-01-443-7716
NSN 5960-01-013-2587
NSN 6650-01-487-9454
NSN 6150-01-162-6348
NSN 5935-00-216-7435