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 6220-00-660-5539
NSN 5998-01-141-7486
NSN 5895-01-113-7725
NSN 6240-01-531-1012
NSN 5990-01-118-8624
NSN 6240-00-456-2578
NSN 5960-01-502-6270
NSN 6685-00-334-0621
NSN 5960-01-424-1781
NSN 6145-01-232-0528
NSN 6135-01-448-9474
NSN 5998-01-577-0438