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 5920-01-602-9407
NSN 5999-01-362-1151
NSN 5855-01-360-3597
NSN 5975-00-398-9716
NSN 6620-00-170-5296
NSN 6110-01-187-6703
NSN 6685-00-927-2199
NSN 5945-00-338-3733
NSN 5910-01-561-0328
NSN 6240-00-972-9098
NSN 6645-01-018-4815
NSN 4140-01-512-6230