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 6620-00-583-2687
NSN 6645-01-076-4655
NSN 6220-00-935-1460
NSN 6610-01-308-6148
NSN 5996-01-167-9234
NSN 4140-00-928-3640
NSN 5960-00-313-3143
NSN 6610-01-521-0582
NSN 5975-00-479-8050
NSN 5935-01-537-3647
NSN 5915-00-220-3696
NSN 6145-00-793-7816