ACL Bearings 5M8339-.75 Main Bearing Set Undersize - 0.75mm

The ACL Bearings 5M8339-.75 main bearing set is engineered for engines with crankshafts that have been reground 0.75mm (approximately .030") undersize. This complete bearing set provides the essential support required for proper crankshaft operation during engine rebuilds and restorations.

Key Features:

• 0.75mm (.030") undersize specification for reground crankshafts
• Premium tri-metal construction with steel backing, copper-lead intermediate layer, and protective overlay
• Hardened steel backs provide superior support and bearing retention
• Increased crush factor ensures stable bearing seating in the housing
• Precision-machined to strict tolerances for optimal oil clearance
• Enhanced load-carrying capacity for demanding conditions

ACL Bearings has manufactured precision engine bearings in Tasmania, Australia for over 70 years, supplying OEM components to major automotive manufacturers worldwide. Their advanced manufacturing processes are ISO certified, utilizing state-of-the-art tooling and design software to create bearings known for durability, innovation, and precision. Whether performing a standard rebuild or high-performance application, ACL bearings deliver the quality and reliability required for long-term engine health.

Important: Undersize bearings feature additional material thickness on the inside diameter to compensate for reduced crankshaft journal dimensions. Always verify crankshaft measurements with Plastigage or micrometers before final assembly to ensure proper bearing clearances.