Main Bearing Set (0.25 mm / 0.10" Undersize) for Mazda 323 1.6L B6 Engines // AN5277SA

High-precision Main Bearing Set specifically designed for Mazda 323 (BG series) models equipped with the 1.6L B6 engine family. These are 0.25 mm Undersize (First Repair Size) bearings, cross-referenced as AN5277SA, engineered for professional engine overhauls where the crankshaft main journals have been ground. Manufactured from premium, high-fatigue resistant materials to ensure smooth crankshaft rotation and maintain precise oil clearance under high-revving engine operations. Precision-made to meet or exceed OEM specifications, these bearings are essential for restoring the structural reliability of the rotating assembly during a professional rebuild.