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 5855-01-330-3669
NSN 6240-01-179-1189
NSN 4140-01-148-0070
NSN 6620-01-423-2612
NSN 5920-00-189-0858
NSN 5895-01-265-3103
NSN 5895-00-203-2379
NSN 5835-01-558-9444
NSN 5945-01-538-2400
NSN 6610-00-135-5026
NSN 5985-01-540-8321
NSN 6110-01-475-6272