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 6135-00-505-0679
NSN 5998-00-203-1232
NSN 4140-01-235-7394
NSN 5915-01-652-9160
NSN 5905-00-767-7594
NSN 6150-01-057-1807
NSN 5905-00-062-1100
NSN 6650-00-155-8431
NSN 6240-00-658-3207
NSN 5920-01-391-5666
NSN 5996-01-513-9511
NSN 5965-01-399-8454