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 5999-00-279-1580
NSN 6320-01-501-7935
NSN 5945-00-365-6582
NSN 6105-01-366-7436
NSN 6610-01-264-4888
NSN 5905-01-598-3009
NSN 6650-00-976-2507
NSN 5999-00-793-0259
NSN 5910-00-986-0555
NSN 6320-01-054-3046
NSN 5835-00-269-2232
NSN 6320-00-194-4252