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 6645-01-212-9474
NSN 7035-01-561-8738
NSN 5965-01-564-8876
NSN 5965-01-236-9988
NSN 5905-00-521-9750
NSN 5950-01-203-8497
NSN 5990-01-558-4536
NSN 5910-00-949-2413
NSN 6320-00-925-0558
NSN 5855-01-343-2933
NSN 5996-01-578-6162
NSN 5895-01-508-4343