ACL Bearings 5M8133-STD Standard Size Main Bearing Set

The ACL Bearings 5M8133-STD is a precision-engineered main bearing set designed to deliver reliable performance and durability for engine rebuilds and performance applications. ACL Bearings has been a trusted name in engine bearing manufacturing for over 70 years, supplying both OEM and aftermarket applications worldwide.

Construction and Materials:

• Tri-metal construction featuring copper alloy with lead, tin, and nickel for superior strength and seizure resistance
• Hardened steel backing for improved support and bearing retention in the housing
• Precision-manufactured to exact tolerances for consistent clearances and reliable fit
• Elimination of flash plating on bearing backs improves heat transfer and maximizes grip

Design Features:

• Standard size (STD) bearing thickness provides nominal clearance based on OEM specifications
• Increased crush factor enhances bearing retention and stability during operation
• Enlarged inner diameter chamfers accommodate performance crankshaft fillet radii
• Optimized groove design for proper oil flow and distribution to connecting rod bearings

ACL main bearing sets are manufactured using ISO-certified processes and state-of-the-art tooling equipment, ensuring each bearing meets exacting quality standards. Suitable for stock replacement, performance rebuilds, and demanding applications where reliability is critical.