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 5910-01-596-4412
NSN 5960-00-626-3644
NSN 5895-01-583-5399
NSN 5960-00-376-0277
NSN 6610-01-139-2809
NSN 6130-01-430-0261
NSN 5945-01-623-5308
NSN 6240-01-553-7914
NSN 5910-00-111-3343
NSN 6110-00-506-2352
NSN 5905-00-810-9539
NSN 7035-01-556-2554