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 4140-01-491-0683
NSN 5855-00-149-0766
NSN 6220-00-169-2567
NSN 6145-01-377-5130
NSN 5925-00-097-7490
NSN 5990-01-425-2175
NSN 5930-00-079-1304
NSN 6645-00-819-5045
NSN 5950-00-580-6170
NSN 5960-00-627-8574
NSN 5935-01-195-9881
NSN 5920-01-415-5020