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 5996-00-677-7996
NSN 5930-00-165-4292
NSN 5975-01-445-7725
NSN 6145-00-084-2096
NSN 5965-00-653-4782
NSN 6240-01-206-4760
NSN 5925-00-808-9514
NSN 6645-01-005-8622
NSN 5895-01-026-1252
NSN 5925-00-493-5918
NSN 5935-01-097-2845
NSN 6145-01-080-7299