ACL Bearings 5M2009P-.25 High Performance Main Bearing Set Undersize - 0.25mm

The ACL Bearings 5M2009P-.25 is a complete high-performance main bearing set engineered for engines requiring a 0.25mm (0.010") undersize crankshaft journal fit. Featuring ACL's proven Duraglide tri-metal construction, these bearings deliver a premium blend of high strength, excellent seizure resistance, and reliable durability suited for both performance rebuilds and demanding street applications.

Key Features:

• Tri-Metal (Duraglide) Construction: Multi-layer copper/lead alloy design provides superior strength and outstanding resistance to seizure under high-load conditions
• Micron-Tolerance Manufacturing: Precision machined to exacting wall thickness specifications, ensuring consistent oil clearances and reliable crankshaft fitment
• Increased Crush: Enhanced radial contact pressure improves bearing retention in the housing and promotes more effective heat dissipation
• Extended Oil Grooves: Full 180? grooved upper shells with matching partial groove in lowers help maintain consistent oil supply to the crankshaft journals
• Enlarged I.D. Chamfers: Accommodate larger fillet radii commonly found on performance and reground crankshafts
• No Flash Plating: Eliminates the risk of overlay movement on bearing backs, maximizing bearing-to-housing contact and heat transfer
• 0.25mm Undersize: Designed for crankshafts that have been ground 0.25mm (0.010") undersize ? verify crankshaft journal dimensions before installation

ACL's main bearing sets are manufactured using precision measurement systems that deliver consistent accuracy to critical characteristics including wall thickness and crush height. This set is sold as a complete main bearing set and is well-suited for engine rebuilds, performance builds, and applications where the crankshaft has been reground to the 0.25mm undersize specification.