King Engine Bearings MB5889Sx0.25 SI-Series Main Bearing Set Undersize - 0.25mm

The King Engine Bearings MB5889Sx0.25 is a complete main bearing set in the SI-Series line, sized at 0.25mm undersize to accommodate crankshafts that have been reground during engine rebuilding. King's SI-Series main bearings are engineered for OE-replacement and standard engine rebuilding applications, delivering reliable, precise fitment for gasoline and diesel engines with factory or reground crankshafts.

Key Features:

• 0.25mm Undersize: Designed for use with crankshaft journals that have been machined 0.25mm under standard diameter during a rebuild
• SI-Series Construction: Bimetal design engineered for OE-equivalent performance and durability in street and daily-driven applications
• Precision Tolerances: King's industry-leading wall thickness tolerances ensure consistent oil clearance and proper bearing crush for reliable seating
• Quality Materials: Steel-backed construction with a precision overlay for long service life and resistance to fatigue under normal operating loads
• Stamped for Traceability: Individual shells are stamped with a production number, allowing full traceability from raw material through final inspection
• ISO / TS 16949 Certified Manufacturing: Produced under stringent quality control procedures at King's certified manufacturing facility

King Engine Bearings has specialized exclusively in engine bearings since 1960, producing a comprehensive line of main bearings, rod bearings, camshaft bearings, and thrust washers for automotive, light truck, heavy-duty, marine, and other internal combustion engine applications. The SI-Series is the go-to choice for engine rebuilders seeking a reliable, correctly sized OE-replacement main bearing set at an undersize dimension.