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 5975-00-955-2224
NSN 5855-01-618-9749
NSN 6650-00-754-2276
NSN 6650-01-327-6334
NSN 5920-00-964-4538
NSN 5985-01-086-5503
NSN 6685-01-175-3431
NSN 2925-00-152-1825
NSN 5985-01-658-3358
NSN 5925-01-507-5272
NSN 5935-01-325-9033
NSN 6135-01-447-5083