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 5855-01-337-0245
NSN 5985-01-646-1855
NSN 5985-00-151-4538
NSN 5950-01-177-9546
NSN 6135-00-010-5275
NSN 5920-01-558-9365
NSN 5920-01-441-8316
NSN 7035-01-227-2546
NSN 5996-00-126-6139
NSN 7035-00-756-4374
NSN 6320-00-139-1090
NSN 5855-01-312-5160