King Engine Bearings MB5269AM AM-Series Main Bearing Set Standard Size Bi-Metal

The King Engine Bearings MB5269AM is a standard-size, bi-metal crankshaft main bearing set engineered for VW and Audi engines running the AKU, AQM, CR, CY, JK, JR, KY, and RA engine codes. Built on King's proven AM-Series platform, these bearings use Alecular Material — an alloy of aluminum, tin, and copper-plus on high-strength steel — equivalent to SAE-783 and designed for dependable performance in low to medium load street and marine applications.

Key Features:

• Bi-Metal Alecular Construction: Aluminum, tin, and copper-plus alloy bonded to a high-strength steel backing for durability and conformability
• Superior Embeddability: Thick Alecular layer absorbs macro-particles and contaminants, reducing crank journal scratching and protecting bearing surfaces
• Tight Tolerance Control: Wall thickness held to ±0.0001 in. for precise oil clearance and consistent fitment
• 100% Lead-Free: Environmentally friendly and user-safe construction with no hazardous lead content
• Half-Groove Design: Upper bearing shell features a half oil groove configuration for optimal lubrication
• Standard (Stock) Crankshaft Size: Direct replacement for stock, unground crankshafts

King Engine Bearings has been manufacturing precision engine bearings since 1960 and is a certified TS16949 (automotive) and AS9100 (aerospace) producer. The MB5269AM is ideal for engine rebuilders seeking a reliable, OEM-quality replacement main bearing set for VW/Audi diesel and gasoline applications.

Specifications:

• Material: Bi-Metal — Alecular Aluminum (SAE-783 equivalent)
• Groove Style: 1/2 Groove (upper shell)
• Crankshaft Undersize: Standard (Stock)
• Maximum Std Shaft Size: 59.017 mm
• Maximum Std Housing Size: 56.518 mm
• Maximum Wall Thickness: 2.499 mm
• Maximum Overall Length: 18.36 mm
• UPC: 611500395802