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 6650-00-575-7487
NSN 5945-00-372-3586
NSN 5915-00-194-4876
NSN 7035-01-227-2546
NSN 6620-01-356-2374
NSN 6320-01-029-4220
NSN 5996-00-468-1874
NSN 5835-00-518-4507
NSN 7035-01-433-3547
NSN 5998-01-381-1641
NSN 5990-01-616-9342
NSN 6645-00-492-9487