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 6150-01-449-6562
NSN 5975-01-522-8315
NSN 5905-01-372-3650
NSN 6610-00-526-4394
NSN 5935-00-737-0626
NSN 5990-01-609-4793
NSN 5920-00-443-1907
NSN 5965-01-196-7760
NSN 5998-01-417-3149
NSN 6320-01-365-2701
NSN 5920-01-299-5294
NSN 6135-01-215-1245