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 5950-00-011-5058
NSN 6240-01-192-2479
NSN 5960-00-602-4257
NSN 5996-01-476-2131
NSN 5985-01-556-8013
NSN 6150-01-456-5778
NSN 5910-00-165-0629
NSN 5998-01-045-1067
NSN 6130-01-294-2759
NSN 5975-01-372-6934
NSN 5895-01-054-0102
NSN 7035-01-441-9509