ACL Bearings 5M2964HC-.25 Race Series Main Bearing Set with Calico Coating - CT-1

The ACL Race Series 5M2964HC-.25 Main Bearing Set features advanced Calico CT-1 dry film lubricant coating designed for high-performance Nissan SR20DE and SR20DET engines. This -.25mm (0.010") undersize bearing set is engineered for demanding racing and performance applications where durability and precision are critical.

Key Features:

• Calico CT-1 dry film lubricant coating provides intermittent dry lubrication during oil starvation conditions
• Tri-metal construction with high-strength overlay plate for improved fatigue resistance
• Hardened steel backing for enhanced bearing retention and support
• Increased eccentricity compensates for bore distortion at high RPM
• 3/4 grooved main bearings optimize load-carrying surface and oil flow to connecting rod bearings
• Elimination of flash plating improves heat transfer and housing grip
• Enlarged ID chamfers accommodate performance crankshafts with large fillet radius

Technical Specifications:

• Bearing Size: -.25mm (0.010" undersize)
• Material: F780 tri-metal construction
• CT-1 coating thickness: 0.00025-0.00030" (6-7.5 microns)
• Maximum shaft size: 54.98mm (2.1646")
• Maximum tunnel size: 58.968mm (2.3216")
• Maximum wall at crown: 1.975mm (0.0778")
• Maximum overall length: 19.1mm (0.752")

The CT-1 coating provides critical protection during cold starts, rough terrain conditions, and other situations where intermittent oil starvation can occur. This advanced coating technology is specifically engineered to withstand extreme conditions in high-performance engines, giving professional engine builders confidence in increased embedability, strength, and durability.