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 5915-01-175-0190
NSN 6320-01-086-2602
NSN 6220-01-321-7088
NSN 5975-01-396-3335
NSN 5950-01-100-5649
NSN 5990-00-230-8981
NSN 5915-00-910-2873
NSN 6135-00-461-3590
NSN 5935-01-158-6291
NSN 6135-00-926-0845
NSN 5935-01-367-1819
NSN 6620-00-058-1533