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 4140-01-431-0751
NSN 7035-00-753-0695
NSN 5985-00-922-1272
NSN 7035-01-553-5036
NSN 6610-01-361-8965
NSN 6650-01-519-5552
NSN 6105-00-495-2981
NSN 6610-01-576-5309
NSN 6150-00-666-3635
NSN 6130-01-322-6772
NSN 5925-01-326-2666
NSN 5945-00-618-4761