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 5905-00-470-4372
NSN 5950-01-289-3340
NSN 6150-00-273-9014
NSN 5835-01-647-0775
NSN 5920-01-162-4553
NSN 5835-00-880-6477
NSN 6650-00-269-5000
NSN 6220-01-483-8529
NSN 5855-00-179-8588
NSN 5965-00-973-9974
NSN 6105-01-033-3649
NSN 6130-01-568-9099