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 5996-01-440-0634
NSN 6610-01-492-6515
NSN 5985-01-246-3417
NSN 6105-01-109-6256
NSN 6240-01-215-3512
NSN 5965-00-463-3929
NSN 6130-01-138-6082
NSN 5960-01-325-2241
NSN 5999-01-275-1231
NSN 6135-01-364-0667
NSN 5895-01-592-3237
NSN 6145-00-444-9679