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 6240-00-344-8582
NSN 5930-01-474-5927
NSN 6145-00-560-5726
NSN 5930-00-653-3918
NSN 5996-01-253-8676
NSN 6150-01-188-3548
NSN 6320-01-374-9924
NSN 6610-01-250-7477
NSN 5945-01-497-8007
NSN 5925-01-656-3013
NSN 5990-01-521-7890
NSN 6135-01-468-2970