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 5999-00-321-5585
NSN 6685-01-082-5490
NSN 5998-01-228-0104
NSN 5855-00-832-9341
NSN 5975-01-068-4125
NSN 5910-01-446-7833
NSN 6135-01-338-2281
NSN 4140-01-384-2858
NSN 6130-01-339-0074
NSN 6240-00-771-2263
NSN 5930-01-314-1970
NSN 6135-00-269-5843