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 4140-00-851-2552
NSN 4140-00-609-2841
NSN 5996-00-661-1151
NSN 5975-01-217-3421
NSN 5915-01-484-1820
NSN 5965-00-043-0897
NSN 4140-01-381-0099
NSN 5935-00-944-8691
NSN 5920-01-652-2866
NSN 5996-01-435-4390
NSN 6620-01-145-1278
NSN 5855-01-258-6180