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 6110-00-402-7637
NSN 4140-00-849-2930
NSN 6150-01-357-7865
NSN 5925-01-508-9339
NSN 5925-01-612-8995
NSN 5945-01-618-4704
NSN 6240-01-344-1105
NSN 6645-01-225-0453
NSN 6685-01-474-7608
NSN 6130-01-576-9618
NSN 6685-01-387-5489
NSN 5999-00-636-6891