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 5990-00-339-2084
NSN 5945-01-110-0303
NSN 5935-01-338-5492
NSN 5945-01-419-1027
NSN 5960-01-168-1063
NSN 5855-00-885-8452
NSN 6645-00-258-8547
NSN 7035-01-453-4242
NSN 5965-00-246-4767
NSN 5905-00-277-7439
NSN 5999-00-690-7597
NSN 6105-01-462-1657