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
NSN 5835-01-501-0526
NSN 6220-01-172-5300
NSN 5990-00-229-4647
NSN 5935-00-351-8712
NSN 6240-01-091-5185
NSN 5990-01-239-1474
NSN 5965-00-910-3233
NSN 5950-01-052-5949
NSN 6610-00-083-8377
NSN 5975-00-633-8532
NSN 6610-01-168-7943