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 4140-01-079-6886
NSN 6320-00-481-7291
NSN 5925-01-566-1871
NSN 5950-00-560-7470
NSN 5998-01-560-7982
NSN 5930-00-263-7854
NSN 5910-00-903-0534
NSN 6610-00-290-0758
NSN 6645-01-515-1978
NSN 6135-00-471-5356
NSN 6650-01-542-1858
NSN 7035-00-281-4082