Composition 4 material stress relieved per specification mil-b-857a ships
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.)
Classification: Copper screws, nuts, bolts, rivets, and other fasteners not threaded
NSN 4140-01-363-9422
NSN 5855-01-470-1910
NSN 5835-01-371-8759
NSN 5998-01-628-7653
NSN 5930-01-054-4710
NSN 5935-01-439-8988
NSN 6620-01-304-8055
NSN 5965-01-556-9520
NSN 5950-00-186-4962
NSN 6685-00-405-4991
NSN 5950-01-266-3735
NSN 6150-00-214-2682