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 6620-00-172-9222
NSN 6240-01-206-4809
NSN 6130-00-222-5291
NSN 6105-01-089-4100
NSN 6150-01-624-7440
NSN 6240-01-277-3762
NSN 5935-01-612-0031
NSN 5835-01-020-2262
NSN 6110-00-976-3361
NSN 6620-01-340-9425
NSN 5950-01-534-7890
NSN 5965-01-452-1249