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 5998-01-148-4969
NSN 6135-01-217-8810
NSN 5999-00-230-4714
NSN 6130-00-061-7486
NSN 6220-01-427-2333
NSN 7035-00-553-6951
NSN 6105-01-112-8206
NSN 5905-01-081-6087
NSN 5930-01-469-1932
NSN 5985-00-644-9752
NSN 6145-00-192-3094
NSN 5920-01-533-3343