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 6105-01-044-5907
NSN 5975-01-184-2736
NSN 6145-01-540-2031
NSN 6650-00-866-9947
NSN 5935-00-564-3618
NSN 6610-00-415-8151
NSN 6650-00-424-7239
NSN 5945-00-961-3137
NSN 4140-00-182-1454
NSN 6135-01-156-4627
NSN 6685-01-254-3490
NSN 6145-00-653-2448