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.)
Dept. of the Navy NSN 5925-01-169-8205
NSN 5920-00-201-4914
NSN 5965-00-226-2915
NSN 5945-00-542-7222
NSN 6105-01-485-1846
NSN 5930-00-456-0889
NSN 5930-00-166-0361
NSN 5960-01-370-4285
NSN 7035-00-111-4389
NSN 5996-01-461-3464
NSN 7035-00-463-7143
NSN 6610-01-139-4713