5120-00-024-0348 (5137)
NSN 5120-00-024-0348 (NIIN 00-024-0348) is a valve seat ring inse driver head in Federal Supply Class 5120, Hand Tools, Nonedged, Nonpowered. Manufacturer part number 5137 (Hall-Toledo Inc, CAGE 00256); also referenced as RD23 (Eaton Aerospace, LLC).
NIIN assigned January 1963; DEMIL A (none required).