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 5920-00-303-5290
NSN 5996-00-247-3808
NSN 5925-00-309-2404
NSN 6650-00-942-4365
NSN 6135-00-377-9165
NSN 6240-01-618-1881
NSN 6130-01-233-1616
NSN 6145-00-141-8095
NSN 6685-00-269-6444
NSN 6135-01-633-8502
NSN 5945-00-661-0506
NSN 6685-00-869-9276