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 5998-00-809-6255
NSN 5975-01-524-4458
NSN 5925-01-611-9080
NSN 5915-01-563-4161
NSN 5965-01-083-7000
NSN 6135-01-417-6539
NSN 5985-01-158-5645
NSN 5990-00-258-0228
NSN 5930-01-273-3151
NSN 6650-00-764-4136
NSN 6240-01-484-6712
NSN 5935-01-457-6203