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 6620-01-094-6549
NSN 6645-00-192-1152
NSN 5925-00-729-7750
NSN 6145-01-634-0388
NSN 6240-01-104-5085
NSN 5999-00-401-0404
NSN 6110-01-545-0816
NSN 6220-00-554-5937
NSN 5920-01-619-0958
NSN 6320-00-977-3930
NSN 2925-00-698-4882
NSN 6135-00-519-1325