King Engine Bearings MB 572AM0.5 Bi-Metal Main Bearing Set 0.5mm Oversize

The King Engine Bearings MB 572AM0.5 is a bi-metal aluminum main bearing set designed for Mazda engines including the VB, VC, MA, NA, UB, and VA engine families. This 0.5mm oversize bearing set is engineered for engine rebuilds requiring a first undersize grind on the crankshaft main journals.

Constructed from King's AM-Series bi-metal aluminum material — equivalent to SAE-783 — these bearings are well-suited for low to medium load engine applications. The aluminum alloy construction provides excellent embedability, allowing micro-contaminants in the oil stream to be absorbed into the bearing surface rather than scoring the crankshaft journals.

Key Features:

• AM-Series Bi-Metal Construction: Standard aluminum-based alloy equivalent to SAE-783, ideal for low to medium load engines
• Bull's Eye Tolerance™ Technology: King's proprietary precision manufacturing process combining highly accurate machining, overplating, and computerized wall thickness monitoring for consistent, tight tolerances
• Superior Embedability: Aluminum alloy surface absorbs macro-particles, reducing crankshaft journal scratching and protecting bearing integrity
• Lead-Free Formula: Environmentally responsible and user-safe bearing material
• 0.5mm Oversize: Engineered for crankshafts ground 0.5mm undersize during engine rebuild
• Precision Tolerance Control: Manufactured to ±0.0001 inch for consistent oil clearance and reliable performance
• OEM-Quality Replacement: Direct-fit replacement suitable for street and marine applications

King Engine Bearings has been a specialist manufacturer since 1960, producing bearings exclusively for automotive, marine, aviation, and performance applications. The MB 572AM0.5 main bearing set is a dependable solution for Mazda engine rebuilds where precise crankshaft clearance and long-term durability are essential.