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 6220-00-728-4559
NSN 5996-00-337-5158
NSN 5855-01-464-3152
NSN 6110-00-575-9795
NSN 5945-00-733-9350
NSN 5855-01-360-6650
NSN 6650-00-484-3616
NSN 6150-00-314-0728
NSN 5950-00-197-0173
NSN 6645-00-017-8252
NSN 5930-01-157-9824
NSN 6240-00-331-8732