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 6150-01-043-1751
NSN 4140-01-057-2915
NSN 5999-01-549-0285
NSN 5920-01-365-5878
NSN 6645-01-524-7027
NSN 5996-00-493-7965
NSN 6145-01-499-4107
NSN 5999-01-464-3219
NSN 5905-00-104-8096
NSN 6620-00-373-9349
NSN 6620-01-560-4497
NSN 6135-00-877-1659