No other part numbers with same form, fit, and function found.
A locking device with two keys spaced approximately 180 degrees center to center and protruding from the seating surface of the ring. When installed the keys mate with companion keyways in the external threads of screw thread inserts, locked-in studs, or similar type items, and cut through sufficient threads of the parent material tapped hole to provide a positive lock between the threaded bodies.
NSN 6650-01-187-5937
NSN 6150-01-230-8613
NSN 6110-00-123-7953
NSN 6610-01-425-1523
NSN 5945-00-959-4528
NSN 6135-01-450-3781
NSN 5998-01-068-4352
NSN 6135-00-553-7995
NSN 6620-01-210-7069
NSN 4140-01-554-3726
NSN 4140-00-857-3202
NSN 5915-00-409-5066