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 5915-00-840-1717
NSN 6240-00-910-3297
NSN 2925-01-430-4206
NSN 6650-00-955-2802
NSN 5990-01-407-6615
NSN 5965-00-405-3793
NSN 5930-00-518-4790
NSN 5920-01-463-9238
NSN 5910-00-470-9479
NSN 5905-01-632-4734
NSN 5998-00-471-1603
NSN 4140-00-053-9499