King Engine Bearings MB5641SI0.25 SI-Series Main Bearing Set Oversize - 0.25mm

The King Engine Bearings MB5641SI0.25 is a precision-engineered SI-Series main bearing set featuring 0.25mm oversize dimensions for engine rebuilding applications. This complete bearing set is designed for aftermarket gasoline or diesel engine rebuilding and performance engines using factory crankshafts.

SI-Series Construction and Materials:

• Bi-metal aluminum construction with 2.5-3% silicon content for enhanced strength
• Steel backing with aluminum bearing alloy bonding layer
• Lead-free design for environmental safety and user protection
• Precision tolerance control of ±0.0001 inch for optimal performance

Key Features:

• Recommended for OE replacement applications and medium-load engines
• Optimized for nodular cast iron crankshafts with improved surface finish compatibility
• Enhanced oil clearance design reduces wear and extends engine life
• Superior embeddability helps protect crankshaft journals from contamination
• Reduces operating noise, vibration, and excess oil flow

King Engine Bearings has specialized in manufacturing premium engine bearings since 1960, utilizing proprietary manufacturing processes and rigorous quality control. Each bearing passes multiple inspection checkpoints to ensure the highest quality standards trusted by professionals in automotive, marine, aviation, and racing applications.