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 5925-01-334-2930
NSN 5996-01-425-2696
NSN 6145-00-104-7789
NSN 5895-01-447-8993
NSN 6220-01-392-1429
NSN 6240-00-153-8929
NSN 5925-01-235-0710
NSN 5935-00-682-0773
NSN 5960-01-467-7516
NSN 5999-01-451-5707
NSN 5945-00-799-0454
NSN 5910-00-943-1437