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 2925-01-615-9859
NSN 2925-01-341-7423
NSN 5915-01-391-6285
NSN 5910-01-432-2825
NSN 5999-01-071-1884
NSN 5855-01-290-3248
NSN 5930-01-133-8879
NSN 6685-01-012-6449
NSN 5920-01-118-5688
NSN 5915-01-055-5643
NSN 5965-01-615-1270
NSN 5950-01-290-3309