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 5998-01-657-4998
NSN 6220-01-091-0334
NSN 5915-01-415-3100
NSN 5985-01-546-7570
NSN 5835-01-529-3050
NSN 5935-01-099-8547
NSN 6685-01-588-2762
NSN 5925-01-440-5538
NSN 5975-01-621-2882
NSN 5910-01-509-1256
NSN 2925-01-518-3453
NSN 6610-01-158-2988