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 5999-01-110-6838
NSN 6320-00-242-3300
NSN 5960-01-017-0989
NSN 5960-01-017-5449
NSN 6220-01-448-5438
NSN 5905-00-805-9924
NSN 6620-00-998-6191
NSN 5945-00-269-5375
NSN 5998-00-400-0233
NSN 5920-00-773-1282
NSN 5935-01-519-9349
NSN 6320-00-646-3311