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 6110-01-621-5719
NSN 4140-01-426-2109
NSN 5835-01-069-7825
NSN 6150-01-441-1628
NSN 6645-01-220-2838
NSN 5905-01-400-0963
NSN 7035-01-419-4317
NSN 5996-00-913-0991
NSN 5999-01-343-2921
NSN 5996-01-641-0124
NSN 5920-00-050-0714
NSN 6220-00-842-2483