5365-01-112-2810 (UR-100-SP-M9)
NSN 5365-01-112-2810 (NIIN 01-112-2810) is a retaining ring in Federal Supply Class 5365, Bushings, Rings, Shims, And Spacers — a resilient metal item, circular or nearly circular, which is designed to be inserted into an internal or external groove and retained by its own spring action. Manufacturer part number UR-100-SP-M9 (Spirolox Inc, CAGE 80756); also referenced as 2587415 (Naval Ship Systems Command).
Key specs: 210000 psi minimum tensile strength; full characteristics table below. NIIN assigned April 1981; DEMIL A (none required); unit of issue EA (each), $0.73 gov standard price; export Schedule B 9606.10.0000; ships at 0.01 lb / 0.0001 cu ft.