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 6105-00-171-6521
NSN 5996-00-265-6573
NSN 6135-01-050-3194
NSN 5999-01-041-1540
NSN 6220-01-457-8632
NSN 6320-00-788-5297
NSN 6610-00-872-1795
NSN 6645-01-413-3506
NSN 5996-00-810-9486
NSN 5915-01-152-1907
NSN 5990-01-012-0613
NSN 5996-01-056-9046