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 6610-01-423-9219
NSN 6105-01-427-2336
NSN 7035-01-146-7096
NSN 6145-00-515-6931
NSN 5999-01-450-7849
NSN 6685-01-515-3179
NSN 6110-01-332-2513
NSN 5999-01-456-8592
NSN 5950-01-401-5321
NSN 6135-00-182-7008
NSN 6130-01-298-2948
NSN 5985-01-148-7866