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 5945-01-631-5431
NSN 6320-00-674-1361
NSN 5999-00-937-6118
NSN 5835-00-257-2852
NSN 6105-00-592-7242
NSN 6220-01-318-0054
NSN 5920-00-261-9848
NSN 5965-01-519-1214
NSN 5945-00-066-2860
NSN 6145-01-293-1093
NSN 5985-01-309-9268
NSN 5910-00-269-4613