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 5915-00-228-0114
NSN 5935-01-424-4566
NSN 5950-01-573-6434
NSN 5950-01-218-8951
NSN 6145-01-543-0124
NSN 6650-00-609-4142
NSN 6650-01-421-2370
NSN 4140-01-439-9856
NSN 4140-01-436-6811
NSN 5835-00-829-0670
NSN 5895-01-107-7766
NSN 4140-00-400-7999