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 6220-01-027-4223
NSN 2925-00-294-2213
NSN 5920-01-347-3608
NSN 5945-01-235-1267
NSN 6320-01-513-9166
NSN 6105-00-148-8279
NSN 6150-00-485-6309
NSN 5950-01-488-5526
NSN 6135-00-935-8769
NSN 6105-01-093-9893
NSN 5960-00-679-8153
NSN 6620-01-658-2480