ACL Bearings 5M1957H-.25 Race Series Main Bearing Set Oversized - 0.25mm

ACL Race Series performance engine bearings are manufactured to exacting tolerances, with micron tolerance machining supported by precision measurement systems that deliver consistent accuracy to key characteristics like wall thickness and crush. This 0.25mm oversized main bearing set features F780 tri-metal bearing material with identical upper and lower halves, designed for Honda and Acura engines including D16, D17, H22, F23, B18, B20, B21, and ZC applications.

Key Features:

• Tri-metal copper alloy construction that provides high strength and excellent seizure resistance
• High strength overlay plate with reduced thickness for improved durability and 3/4 grooving on main bearings for optimum oil supply
• Ensures reliable fit and helps maintain consistent clearances
• Increased crush and elimination of flash plating for better fitment and improved heat transfer
• Increased eccentricity to improve shape adaptation and compensate for bore distortion at high speed operation
• Oversize chamfers where applicable for improved oil flow

ACL Race Series performance bearings are engineered for extreme endurance under harsh conditions, designed to withstand high RPMs and big boost where fatigue, stress wear, and failure factors are minimized. Improvements of material, dynamic thickness, heat conduction, oil grooves and oil distribution make ACL one of the leading bearing manufacturers.

Specifications:

• Bearing Size: 0.25mm Oversized
• Bearing Material: F780 Tri-Metal
• Bearing Half Type: Identical Halves
• Max Shaft Size: 55mm (2.165")
• Max Tunnel Size: 59.02mm (2.324")
• Overall Length: 20mm (0.787")