ACL Bearings 5M1959H-.25 H-Series Main Bearing Set for Honda B-Series, 0.25 mm Undersize

The ACL Bearings 5M1959H-.25 H-Series Main Bearing Set is designed for Honda B-Series engines requiring main bearings with a 0.25 mm undersize specification. This matched bearing set supports proper crankshaft-to-bearing clearance and is suited for engine rebuilds, performance applications, and precision bottom-end assembly where dependable fitment is essential.
Manufactured under the ACL Bearings H-Series line, these main bearings are engineered to provide durable support for the crankshaft under demanding operating conditions. The 5M1959H-.25 part number identifies the 0.25 mm undersize configuration, making accurate crankshaft measurement and proper machine-work verification important before installation. Always compare the bearing specification with the engine builder’s clearances and the crankshaft journal measurements.
This kit is intended for Honda B-Series applications and is supplied as a main bearing set for complete engine assembly needs. Its performance-focused design makes it a practical choice for replacement or upgraded internal engine components. Follow the engine manufacturer’s service procedures during installation, including correct bearing placement, lubrication, torque sequence, and clearance inspection.
ACL Bearings part number 5M1959H-.25 offers a reliable solution for builders seeking H-Series main bearing performance in a precisely specified undersize configuration. The component is not air restricted and does not require truck freight, helping simplify handling and application planning for professional shops and experienced enthusiasts.

Features:

• Brand: ACL Bearings

• Part Number: 5M1959H-.25

• Bearing Type: H-Series main bearing set

• Application: Honda B-Series engines

• Undersize Specification: 0.25 mm undersize

• Kit Contents: Main bearing set

• Installation Requirement: Verify crankshaft journal measurements and bearing clearances before installation

• Shipping Classification: Not air restricted and not truck freight only