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 5915-01-513-2531
NSN 6240-01-650-2640
NSN 5930-01-451-1043
NSN 6145-01-113-2337
NSN 5965-01-215-0993
NSN 6240-00-319-0173
NSN 6620-01-468-6017
NSN 6110-01-394-9891
NSN 7035-00-003-7518
NSN 6130-00-689-7616
NSN 5925-00-246-0582
NSN 5998-01-381-6724