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 7035-01-297-9806
NSN 5950-00-585-9598
NSN 5945-01-144-9931
NSN 6685-01-208-2132
NSN 5998-00-151-5392
NSN 5990-01-218-5160
NSN 5998-00-954-1720
NSN 6645-00-754-4108
NSN 5920-00-587-6935
NSN 6135-01-297-5565
NSN 6135-00-080-9176
NSN 6610-01-351-0072