King Engine Bearings MB637CA0.5 Trimetal Main Bearing Set 0.5mm Undersize

The King Engine Bearings MB637CA0.5 is a complete trimetal main bearing set designed for the BMW S85B50A V10 engine, offered in a 0.5mm undersize for use with reground or undersized crankshafts. King Engine Bearings is a globally recognized OEM and performance bearing supplier known for precision manufacturing and tight tolerances.

This set features King's trimetal construction, which layers a steel backing, an intermediate copper-lead or aluminum alloy lining, and a precision electrodeposited overlay for superior surface conformability, embed-dability, and fatigue strength. This design is well-suited for the high-revving, high-output demands of the S85B50A — a naturally aspirated 5.0L V10 producing over 500 horsepower at the top of its RPM range.

Key Features:

• Complete main bearing set for BMW S85B50A V10 engine
• Trimetal construction: steel backing with precision overlay for durability and conformability
• 0.5mm (0.020") undersize — designed for use with reground crankshafts
• Tight OEM-spec tolerances for proper oil clearance and film thickness
• High fatigue strength suitable for performance and high-RPM applications
• King CA (performance) series designation
• Manufactured to stringent quality control standards

The CA series from King Engine Bearings is engineered for performance-oriented builds and demanding operating conditions, making the MB637CA0.5 an excellent choice for engine rebuilds on the S85B50A found in the BMW E60 M5 and E63/E64 M6. Always verify crankshaft journal sizing and oil clearance specifications prior to installation.