King Engine Bearings MB 474AM0.25 Bi-Metal Main Bearing Set 0.25mm Oversize

The King Engine Bearings MB 474AM0.25 is a complete main bearing set designed for Mazda engines using the JE06, JE27, JE39, and JE48 engine families. This 0.25mm oversize set is engineered for use during engine rebuilds where the crankshaft has been reground to the 0.25mm undersize specification.

Material Construction:

• Bi-Metal Aluminum (AM Series) — standard aluminum-based bearing material equivalent to SAE-783
• Optimized for low to medium load engine applications, including standard street and light-duty use
• Steel backing with an aluminum-alloy overlay provides a reliable combination of strength and conformability

Key Features:

• 0.25mm oversize — designed for crankshafts reground 0.25mm under nominal journal diameter
• Precision-engineered wall thickness for consistent oil clearance
• High-quality steel backing for structural integrity and housing bore retention
• Manufactured to King Engine Bearings' exacting tolerances for reliable seating and performance

King Engine Bearings has been a specialist bearing manufacturer since 1960, producing bearings exclusively for internal combustion engines across automotive, light truck, marine, and industrial applications. Every King bearing is built to strict quality standards to ensure proper fit and long service life during engine rebuilds.