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 6135-01-535-2307
NSN 5855-01-010-4921
NSN 6685-01-205-6258
NSN 6620-00-999-2425
NSN 6610-00-607-9459
NSN 6220-00-181-4643
NSN 5985-01-540-9259
NSN 5915-01-121-7946
NSN 5855-01-040-3881
NSN 5990-01-378-7349
NSN 5835-01-014-4574
NSN 4140-01-243-1658