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.)
Dept. of the Navy NSN 5945-00-754-5875
NSN 7035-01-463-9855
NSN 5930-01-367-0448
NSN 5990-01-503-0194
NSN 6105-01-281-7714
NSN 6620-01-185-9134
NSN 6220-01-500-1857
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NSN 5930-00-186-9934