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 5910-00-756-6432
NSN 5998-01-429-9322
NSN 5925-01-174-5403
NSN 6145-00-868-4677
NSN 5915-00-145-6181
NSN 5855-01-188-4049
NSN 6150-00-168-4921
NSN 6685-00-225-8571
NSN 5930-01-486-2551
NSN 5945-01-208-9107
NSN 5999-00-838-7506
NSN 6610-01-627-8985