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 5990-01-272-4091
NSN 5855-01-656-6808
NSN 5915-00-772-7518
NSN 5960-01-052-9577
NSN 5895-00-006-2884
NSN 5920-01-463-8286
NSN 5998-01-360-5898
NSN 5975-01-318-5946
NSN 6105-01-534-9701
NSN 7035-01-094-2365
NSN 6110-01-602-6714
NSN 5910-00-720-1431