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 6240-01-359-7230
NSN 7035-01-220-6392
NSN 6145-01-414-2195
NSN 2925-01-476-3224
NSN 6650-01-256-4610
NSN 6150-01-209-9038
NSN 6685-01-178-4717
NSN 5905-01-493-7855
NSN 5999-01-157-9813
NSN 5915-01-535-6666
NSN 5920-00-015-7824
NSN 5895-01-514-9142