Used on a tactical police shotgun
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.)
NSN 6220-00-571-1958
NSN 6150-01-634-0575
NSN 6685-00-287-7564
NSN 6320-01-544-6447
NSN 5835-00-931-5568
NSN 5996-00-919-0682
NSN 6320-01-335-8336
NSN 6110-01-463-3395
NSN 5960-01-142-1995
NSN 6105-01-533-5232
NSN 5855-01-147-6024
NSN 5965-00-990-8669