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 6130-00-390-9718
NSN 5905-01-237-4777
NSN 6105-01-516-9936
NSN 6145-01-241-0321
NSN 5910-01-201-2946
NSN 6145-00-181-9622
NSN 6685-01-533-2415
NSN 5835-00-315-3797
NSN 6220-01-185-5545
NSN 5996-01-423-8452
NSN 5985-01-629-5372
NSN 7035-00-235-3529