ACL Bearings 5M1643P-.50 Race Series Main Bearing Set 0.50mm Undersize

The ACL Bearings 5M1643P-.50 is a high-performance race series main bearing set designed for demanding motorsports applications. This bearing set features 0.50mm undersize dimensions for use with reground crankshafts that have been machined 0.50mm undersize.

Race Series Performance Features:

• Tri-metal construction with high-strength overlay plate and reduced thickness for improved fatigue resistance
• Hardened steel backing on all bearings improves support and retention in the housing
• Elimination of flash plating on bearing backs maximizes heat transfer and housing grip
• Increased eccentricity compensates for bore distortion at high RPM and assists hydrodynamic oil film formation
• Enhanced crush design for superior bearing retention under extreme conditions
• Engineered oil distribution and guides for optimal lubrication under high-stress operation

ACL Race Series bearings are trusted by professional engine builders and racers worldwide, from drift racing to drag racing competitions. These bearings deliver the metallurgical quality and engineering precision required for high-RPM, high-boost applications where standard bearings cannot survive.