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 6240-00-786-6170
NSN 5910-00-388-6737
NSN 5990-01-641-5782
NSN 5990-00-928-5655
NSN 5920-01-430-5001
NSN 5996-00-874-9163
NSN 5998-01-222-5763
NSN 5855-01-294-2804
NSN 5998-00-611-9438
NSN 6645-01-193-5214
NSN 5925-01-421-4473
NSN 6650-01-600-4843