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 6685-00-925-0110
NSN 6320-01-454-1965
NSN 5985-01-106-4628
NSN 2925-01-197-7864
NSN 5920-01-437-9645
NSN 5905-00-967-1653
NSN 5930-01-411-1014
NSN 2925-00-404-6461
NSN 5915-01-605-3326
NSN 6620-01-629-4045
NSN 4140-00-075-2000
NSN 5990-01-044-4767