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 5920-00-391-6252
NSN 5930-00-199-9608
NSN 4140-01-654-4336
NSN 6150-01-308-2338
NSN 5999-01-014-3470
NSN 5985-01-155-2042
NSN 6105-01-485-9902
NSN 6145-00-338-5645
NSN 5920-01-369-0108
NSN 5925-01-307-5497
NSN 5990-01-472-2447
NSN 5960-01-411-5899