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 6685-00-462-4989
NSN 6620-01-392-7191
NSN 6220-01-281-5464
NSN 5925-01-599-3113
NSN 6320-00-857-4073
NSN 5990-00-202-5127
NSN 5996-01-335-0584
NSN 5985-01-311-4813
NSN 5985-00-019-3612
NSN 5999-01-192-5292
NSN 6645-00-574-9712
NSN 6610-01-436-2809