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 5945-01-217-2419
NSN 6150-01-459-1842
NSN 5855-01-609-1869
NSN 6145-01-126-2978
NSN 5999-01-077-1529
NSN 5999-01-418-8503
NSN 6645-00-007-5305
NSN 5895-00-493-0042
NSN 5920-01-145-3077
NSN 6220-01-435-8699
NSN 5920-01-489-7090
NSN 6130-01-247-3566