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 4140-01-016-3143
NSN 5999-01-281-0499
NSN 6130-01-381-4935
NSN 5895-01-143-2302
NSN 5855-00-879-0546
NSN 5999-00-390-5974
NSN 5905-01-467-2765
NSN 5996-00-518-4741
NSN 5996-01-158-2531
NSN 5915-01-159-0117
NSN 6645-01-473-1371
NSN 6320-00-164-4087