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 5990-01-139-6042
NSN 5990-01-164-8673
NSN 6110-01-406-4818
NSN 5855-00-760-3870
NSN 6105-01-234-8596
NSN 5920-01-478-0659
NSN 6685-01-459-1979
NSN 6610-01-323-7045
NSN 5930-01-421-2417
NSN 5920-00-889-7826
NSN 6135-01-175-7311
NSN 5998-01-034-1244