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 6135-00-422-3967
NSN 6145-01-160-7658
NSN 5999-01-461-4337
NSN 5920-00-016-8255
NSN 4140-00-214-0554
NSN 2925-01-068-3844
NSN 5965-01-331-1644
NSN 6685-01-481-3322
NSN 6610-01-527-8006
NSN 6650-01-297-1652
NSN 5960-01-252-8821
NSN 5910-00-824-0188