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 5965-01-560-8572
NSN 5950-01-213-6034
NSN 5925-00-275-0380
NSN 5915-00-323-1262
NSN 5950-00-910-5840
NSN 6685-00-168-1688
NSN 5925-01-200-2714
NSN 5895-00-198-5537
NSN 5945-00-005-0325
NSN 6650-01-004-1261
NSN 6135-01-388-2761
NSN 6135-01-354-3337