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 6130-00-113-1994
NSN 5835-00-777-8333
NSN 6620-00-261-5396
NSN 6150-01-581-8275
NSN 5935-01-210-1860
NSN 6110-00-120-1215
NSN 6110-01-104-4299
NSN 6240-00-027-2680
NSN 6645-01-361-2829
NSN 5965-01-142-1807
NSN 5895-01-162-0218
NSN 5960-01-420-4744