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 5905-01-322-5490
NSN 6105-01-576-9724
NSN 6145-01-235-6764
NSN 6240-01-112-7577
NSN 5950-01-262-6171
NSN 5920-01-023-0040
NSN 6135-00-377-9165
NSN 5990-01-506-7695
NSN 5895-00-151-3934
NSN 6130-00-556-2027
NSN 5905-01-004-9961
NSN 6645-01-047-3026