King Engine Bearings MB5269XP Crankshaft Main Bearing Set XP Series pMaxBlack Tri-Metal Race

The King Engine Bearings MB5269XP is a crankshaft main bearing set from King's XP Racing series, engineered specifically for high-performance and race applications. Designed for VW/Audi engines with engine codes AKU, AQM, CR, CY, JK, JR, KY, and RA, this set delivers the metallurgical precision and load capacity demanded by serious competition engines.

pMaxBlack™ Tri-Metal Construction:

The MB5269XP features King's proprietary pMaxBlack™ overlay technology — a unique tri-metal structure engineered to outperform conventional race bearings. The pMaxBlack™ overlay contains elevated copper content and is strengthened through a nano-scaled hardening process that modifies the molecular structure, creating a fatigue-resistant black shield. The result is a 29% increase in overlay hardness (18.1 HV) and an overall 24% increase in load capacity, reaching up to 10,200 psi — significantly beyond typical high-performance bearing overlays.

The intermediate layer is similarly upgraded, with increased tin content (4.5%) raising hardness to 115 HV and an intermediate load capacity of 17,000 psi — 22% harder than a standard race bearing intermediate layer.

SecureBond™ Structural Integrity:

Each bearing shell incorporates King's SecureBond™ micro-etch adhesion process, which strengthens the bond between tri-metal layers to resist delamination under extreme load or metal-to-metal contact conditions — a critical feature at high RPM and sustained racing loads.

Key Features:

• XP series pMaxBlack™ tri-metal construction with nickel barrier
• 24% greater load capacity than conventional tri-metal race bearings
• Overlay withstands loads up to 10,200 psi
• Nano-scaled proprietary hardening process for fatigue resistance
• SecureBond™ adhesion process for superior inter-layer stability
• 0.0005″ metallurgically enhanced and hardened performance overlay
• Mains are half-grooved for uncompromised lower shell load capacity
• Enlarged, chamfered oil holes for improved lubrication
• Bull's Eye Tolerance™ — shells matched to 0.0001″ wall thickness
• Narrowed design to clear large-radius aftermarket crankshafts

Cross-Reference OEM Part Numbers: 026105561B, 026105561C, 026105591B, 052105561A, 056105561B, 026198491

Cross-Reference Supplier Part Numbers: GLYCO H084/5, KS 77152600, MAHLE 029HS19761000, NPR 60-5012-00

Best suited for high-load, long-duration race applications including circle track, off-road, and off-shore racing where steel crankshafts are used and the engine is regularly inspected and rebuilt.