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 4140-01-634-0330
NSN 6620-01-633-8443
NSN 6150-01-469-6796
NSN 6650-01-246-0213
NSN 5965-01-422-9770
NSN 5975-00-203-8416
NSN 5935-01-141-5045
NSN 6150-01-463-4674
NSN 6620-00-168-0308
NSN 6645-01-028-2186
NSN 6620-01-217-3216
NSN 5965-01-030-0108