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 6150-01-482-9032
NSN 5925-00-373-0936
NSN 5910-01-440-1334
NSN 5835-01-495-0595
NSN 5895-00-091-9154
NSN 5935-01-050-7487
NSN 7035-00-529-3128
NSN 6220-01-579-0349
NSN 6320-00-894-1644
NSN 6135-00-416-2898
NSN 5965-01-250-3214
NSN 5965-00-080-2045