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 5998-00-891-9674
NSN 5999-01-208-8928
NSN 5835-01-205-6614
NSN 6130-01-415-0944
NSN 5960-00-423-7842
NSN 6320-00-070-4544
NSN 6240-01-492-9733
NSN 5855-01-018-1247
NSN 6105-01-360-8792
NSN 6320-01-207-0636
NSN 6620-01-566-3456
NSN 4140-00-038-7577