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 4140-01-091-6797
NSN 5965-01-217-0310
NSN 5935-01-055-2104
NSN 7035-01-045-7202
NSN 5905-01-476-6013
NSN 5905-00-982-0477
NSN 6645-01-312-3558
NSN 6135-01-575-8362
NSN 5998-00-349-3575
NSN 6110-01-102-4448
NSN 5930-01-295-2312
NSN 6645-01-224-0101