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 4140-01-454-7119
NSN 5905-00-337-0447
NSN 6150-01-457-8519
NSN 5999-01-310-8176
NSN 6650-01-292-9734
NSN 6150-01-462-5362
NSN 6610-01-250-2811
NSN 6150-00-710-7191
NSN 6320-00-422-9006
NSN 6150-00-169-4232
NSN 6110-01-485-0276
NSN 6110-00-294-7648