4820-00-545-1793 (6768096)
NSN 4820-00-545-1793 (NIIN 00-545-1793) is a valve seat in Federal Supply Class 4820, Valves, Nonpowered — a replaceable item designed to provide a stationary seating surface for a mating, moveable item such as a valve disk or the like. Manufacturer part number 6768096 (Allison Transmission Inc, CAGE 73342); also referenced as 7708199 (U S Army Tank Automotive Command).
Key specs: 60 rockwell c nominal overall hardness; full characteristics table below. NIIN assigned January 1963; DEMIL A (none required); export Schedule B 8481.90.9090.