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 6240-01-367-8749
NSN 5945-01-227-5525
NSN 5998-01-176-7298
NSN 6610-01-466-9985
NSN 6620-01-512-2016
NSN 6105-00-014-3509
NSN 2925-00-132-1280
NSN 4140-00-587-1615
NSN 6645-01-413-0515
NSN 5895-01-453-4341
NSN 5855-01-509-6872
NSN 6685-01-295-8547