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 5985-01-489-5251
NSN 5990-01-033-7817
NSN 5998-01-430-7248
NSN 5855-00-411-8688
NSN 5945-01-181-5586
NSN 5920-01-542-5306
NSN 5996-00-279-1510
NSN 4140-01-064-5528
NSN 5895-01-205-6194
NSN 5910-00-660-8010
NSN 5905-01-521-6299
NSN 6610-01-593-0135