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 6685-01-634-0611
NSN 5965-01-499-4380
NSN 6610-01-426-5090
NSN 5990-00-202-5127
NSN 5930-01-249-0749
NSN 6610-00-647-3830
NSN 5945-01-391-3510
NSN 6620-01-051-2045
NSN 6110-01-633-5037
NSN 2925-01-418-3296
NSN 5960-00-945-1107
NSN 5985-01-427-3734