ACL Bearings 5M8017-.25 Main Bearing Set Undersize - 0.25mm

The ACL Bearings 5M8017-.25 Main Bearing Set is engineered for precision engine rebuilds requiring 0.25mm undersize bearings. These undersize bearings feature extra material thickness on the inside surface and are specifically designed for crankshafts that have been machined or ground undersize, ensuring proper clearances during engine overhaul.

Key Features:

• 0.25mm undersize specification for European-style crankshaft grinding requirements
• Manufactured to exacting tolerances with micron-level precision machining for consistent wall thickness and crush characteristics
• Aluminum-silicon bimetal construction providing ideal physical and metallurgy advantages over ordinary bearings
• Trimetal construction with hardened steel backs for enhanced strength, fatigue resistance, and improved bearing retention
• No flash plating for improved heat transfer and maximum grip between bearing and housing

ACL specializes in manufacturing high-quality engine bearings and has been a leading brand in the automotive parts market for over 70 years. ACL Race Series bearings are standard components in race engines that have set records and won championships from drift racing to NASCAR competitions. Always verify crankshaft journal measurements and check bearing clearances with plastigage before final assembly.