ACL Bearings 5M1959HC-.025 Race Series Main Bearing Set .025mm Oversized CT-1 Coated

The ACL Bearings 5M1959HC-.025 is a high-performance main bearing set designed for Acura B17A1, B18A1, B18B1, B18C1, B18C5 VTEC engines and Honda K20A2, K20A3, K24A engines. This 0.025mm oversize bearing is equivalent to a Honda green bearing with an extra 0.025mm of thickness, making it ideal for precision engine builds and performance applications.

CT-1 Calico Coating Technology:

These bearings combine ACL's tough Race Series lining and overlay metallurgy with Calico's renowned CT-1 dry film lubricant coating that helps reduce friction and abrasive wear. The CT-1 coating provides a dry film lubricant that protects against intermediate oil starvation, offering critical protection during cold starts and demanding driving conditions. CT-1 coated bearings have shown oil temperature reductions as much as 15°F to 20°F.

Key Features:

• Race Series construction with unique combination of design, metallurgy and engineering for high-performance trimetal engine bearings
• CT-1 coating thickness of 0.00025" to 0.00030" (6 to 7.5 microns)
• 3/4 grooved design optimizes bearing load carrying surface area and oil flow to connecting rod bearings
• Manufactured to exacting tolerances with micron tolerance machining for consistent wall thickness and crush
• Provides intermittent dry lubrication and is not affected by dust or dirt
• Enlarged ID chamfers on bearing edges to accommodate large fillet radius on performance crankshafts

K Series Parts has used ACL main bearings in almost every K-series motor they have built and highly recommends them for any K20 and K24 motor build. These bearings are engineered to withstand higher RPM conditions and provide the dependability required for both high-performance builds and engine rebuilds.