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 6320-00-553-8427
NSN 6645-00-580-9605
NSN 5950-01-158-2606
NSN 6610-01-520-6889
NSN 5990-00-809-5286
NSN 6145-00-419-9943
NSN 5975-01-003-8937
NSN 5930-01-165-8930
NSN 5835-00-612-1621
NSN 6145-01-566-2732
NSN 6650-00-221-9425
NSN 6220-00-538-1074