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 5925-01-264-1814
NSN 5930-01-609-5662
NSN 5910-01-055-3831
NSN 6650-01-168-1659
NSN 6650-00-242-7961
NSN 6620-00-473-3692
NSN 5945-01-327-3553
NSN 5905-00-758-3494
NSN 6645-01-323-1956
NSN
NSN 5945-01-109-0492
NSN 7035-01-432-2424