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 6620-01-378-5579
NSN 5930-01-234-9649
NSN 6685-01-495-9071
NSN 5910-01-212-9281
NSN 6320-01-352-5653
NSN 5998-00-884-0791
NSN 5895-01-363-4033
NSN 5965-01-109-2917
NSN 5975-01-123-4562
NSN 5935-00-081-3869
NSN 5920-00-833-7245
NSN 6685-01-391-6790