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 5999-00-556-6313
NSN 5975-01-395-8467
NSN 5935-01-176-0934
NSN 5925-01-071-6671
NSN 6610-01-255-4544
NSN 7035-01-107-2811
NSN 6220-01-185-5545
NSN 6220-00-134-1299
NSN 4140-01-420-6508
NSN 5895-01-109-1801
NSN 6145-00-613-8489
NSN 5945-01-512-9376