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 5999-01-273-8816
NSN 6240-00-269-9477
NSN 5960-01-195-7590
NSN 6145-01-468-5377
NSN 5950-01-641-6918
NSN 5990-00-345-8967
NSN 6320-00-403-6003
NSN 6110-01-400-4207
NSN 6610-01-441-5062
NSN 6135-01-092-4734
NSN 5965-01-646-1122
NSN 6240-01-391-8915