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 6145-00-365-0121
NSN 4140-01-018-2984
NSN 6110-00-715-0960
NSN 5999-00-460-6023
NSN 7035-00-295-0451
NSN 5999-00-226-0109
NSN 6620-00-189-2381
NSN 6685-00-263-4545
NSN 5915-00-890-5557
NSN 6110-00-238-9636
NSN 5915-01-400-6125
NSN 2925-01-599-1901