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 6645-00-071-2200
NSN 6645-01-315-6584
NSN 6130-01-408-9020
NSN 6110-01-180-2148
NSN 6240-01-054-2289
NSN 5965-01-164-7982
NSN 5935-00-216-4492
NSN 6110-00-305-2838
NSN 6150-01-030-4082
NSN 6220-00-988-5311
NSN 6110-01-344-1949
NSN 5895-01-519-2915