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 6110-00-822-4411
NSN 5895-00-442-3937
NSN 5996-01-386-4165
NSN 5965-01-280-3772
NSN 5985-01-357-6127
NSN 5996-01-005-9522
NSN 5855-01-535-7127
NSN 5920-01-095-8989
NSN 4140-00-886-1710
NSN 5925-00-803-5491
NSN 5935-01-157-5733
NSN 6650-01-049-5361