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 6620-00-127-0816
NSN 5975-01-347-0481
NSN 5965-01-487-4479
NSN 6105-01-510-5312
NSN 5996-01-187-5535
NSN 5975-00-338-6242
NSN 5996-00-898-2654
NSN 6610-00-080-2985
NSN 5930-00-943-0134
NSN 6685-01-127-2683
NSN 6145-00-251-2192
NSN 6150-00-866-6496