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 5996-01-651-4195
NSN 6240-00-160-0786
NSN 5905-01-186-9719
NSN 5855-00-087-7833
NSN 5915-00-952-5658
NSN 5950-00-051-7946
NSN 6220-01-417-5493
NSN 6220-00-102-9683
NSN 5895-01-004-9050
NSN 5965-01-226-7077
NSN 5895-01-140-9663
NSN 6135-01-417-6539