King Engine Bearings MB 612AM0.25 AM-Series Main Bearing Set 0.25mm Undersize

The King Engine Bearings MB 612AM0.25 is an OE-replacement crankshaft main bearing set designed for Volvo 5-cylinder engines including the B5252, B5254F/T, and B5234F/T families. This set is supplied in a 0.25mm undersize to accommodate crankshafts that have been reground to the first standard undersize, making it an essential component for engine rebuilds requiring crankshaft refurbishment.

Key Features:

• AM-Series Bi-Metal Construction: Features King's standard aluminum-based bearing material, the softest bi-metal in King's lineup, equivalent to SAE-783 specification
• Lead-Free Material: Environmentally responsible, lead-free composite that meets modern safety and sustainability standards
• OE Replacement Grade: Engineered to meet or exceed original equipment specifications for reliable street and daily-driver use
• Low-to-Medium Load Rating: Ideal for passenger car engines operating under typical street or marine duty cycles
• Complete Set: Includes 6 pairs of main bearing shells to fully service the crankshaft main journals
• 0.25mm Undersize: Designed for use with crankshafts ground 0.25mm (approximately 0.010") under standard journal diameter

King Engine Bearings manufactures exclusively engine bearings, allowing them to apply focused engineering and tight quality tolerances across their entire product range. The AM-Series is the recommended choice for OE-style replacements in low-to-medium load passenger car applications, offering a dependable, cost-effective solution for engine rebuilders and professional mechanics.