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 6645-01-592-7563
NSN 6130-01-127-0725
NSN 6240-01-089-3827
NSN 6220-01-465-5401
NSN 6130-00-528-1266
NSN 5998-01-622-4809
NSN 5998-00-192-7188
NSN 6645-01-368-8284
NSN 6685-01-499-1995
NSN 6620-01-498-4780
NSN 5910-01-084-5951
NSN 6610-01-618-2158