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 6105-00-533-3142
NSN 6645-01-459-9586
NSN 6320-01-544-6447
NSN 5950-01-456-6255
NSN 6650-00-229-3790
NSN 7035-01-211-5636
NSN 6645-00-140-5173
NSN 5895-01-510-9431
NSN 5895-00-462-1916
NSN 4140-00-626-1277
NSN 6240-01-337-2509
NSN 5895-00-427-9617