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 6145-00-815-6959
NSN 5990-01-351-4621
NSN 6610-00-186-9180
NSN 5975-01-445-4404
NSN 5975-01-598-5935
NSN 5990-00-195-9460
NSN 5975-01-066-5394
NSN 6220-01-340-9522
NSN 5930-01-541-2537
NSN 6610-01-580-0766
NSN 5925-01-183-8337
NSN 5855-01-175-0284