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 6110-00-161-4115
NSN 6130-01-124-5025
NSN 6105-00-230-0178
NSN 6610-00-731-9532
NSN 5950-01-391-5647
NSN 5935-00-081-4171
NSN 6110-01-068-4998
NSN 5960-01-044-3798
NSN 5895-01-430-5452
NSN 5945-00-342-4653
NSN 5965-01-545-2617
NSN 5835-00-764-4388