King Engine Bearings MB5256AM0.75 AM-Series Crankshaft Main Bearing Set

The King Engine Bearings MB5256AM0.75 is a crankshaft main bearing set engineered for OE replacement applications. Part of King's AM-Series, this set is constructed using a bi-metal, aluminum-based material equivalent to SAE-783 — the softest bi-metal in King's product range — making it ideally suited for passenger car engines operating under low to medium loads.

Key Features:

• AM-Series bi-metal construction — aluminum-based material (SAE-783 equivalent) provides excellent conformability and embeddability
• Superior embeddability — helps absorb macro-particles to reduce crankshaft journal scratching and bearing overlay damage
• Lead-free formulation — environmentally friendly and user-safe bearing material
• Tight tolerance control — manufactured to ±0.0001 in. for precise crankshaft fitment
• 0.75mm undersize — designed for use with reground crankshafts at the 0.75mm undersize specification
• 5 pairs included — complete main bearing set for full engine rebuild
• OE replacement grade — designed to meet or exceed original equipment standards

King Engine Bearings has been a specialist bearing manufacturer since 1960, supplying bearings across automotive, marine, aviation, and standby power industries. Every bearing passes multiple rigorous quality control checkpoints during production to ensure consistent performance and reliability. The MB5256AM0.75 is an ideal choice for engine rebuilders seeking a dependable, quality main bearing set at the 0.75mm undersize specification.