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 5998-01-644-6492
NSN 5965-00-989-9345
NSN 5930-01-549-5708
NSN 6685-01-507-6736
NSN 6130-00-909-2101
NSN 6145-01-035-9813
NSN 6130-00-815-2293
NSN 5915-00-254-3436
NSN 5990-00-008-1828
NSN 6220-01-576-8405
NSN 5855-01-531-7529
NSN 6240-01-003-5797