ACL Bearings 1B481H-STD Race Series H-Series Rod Bearing Set Standard Size

The ACL Bearings 1B481H-STD is a high-performance Race Series connecting rod bearing set engineered for demanding race engine applications. Part of ACL's acclaimed H-Series lineup, these bearings deliver exceptional durability and reliability under extreme operating conditions.

Advanced Trimetal Construction:

• Trimetal design featuring lead, tin, copper, and nickel for superior strength and seizure resistance
• Hardened steel backing maintains crush integrity under high loads and temperatures
• High-strength overlay with reduced thickness for improved fatigue properties
• Bearing material designation F781 for consistent performance

Precision Engineering Features:

• Standard (STD) size bearing set includes upper and lower bearing halves
• Manufactured to exacting tolerances for reliable fit and consistent oil clearances
• Maximum shaft size: 2.125 inches (53.975mm)
• Maximum tunnel size: 2.251 inches (57.163mm)
• Maximum wall thickness at crown: 0.062 inches (1.582mm)
• Overall bearing length: 0.847 inches (21.52mm)
• Vertical oil clearance range: 0.0004-0.0026 inches

Race-Ready Design:

• Large chamfers accommodate larger crankshaft fillets commonly found in performance builds
• Increased crush and tighter wall tolerances ensure superior bearing retention
• Enhanced heat transfer design for improved thermal management
• Optimized eccentricity compensates for bore distortion at high RPM

ACL Race Series bearings are recognized throughout the motorsports world as a premier brand, with proven performance in record-setting engines across multiple racing disciplines. Each bearing set is manufactured with meticulous attention to wall thickness accuracy and dimensional precision, ensuring your high-performance engine has the foundation it needs to perform reliably at the limit.