Clevite MS-1812A-.25MM High Performance Main Bearing Set (0.25mm Undersize)

The Clevite MS-1812A-.25MM is a high-performance engine crankshaft main bearing set designed for demanding applications. This undersize bearing set (0.25mm) is engineered to provide optimal lubrication and durability in performance and racing engines.

Key Features:

• TriMetal bearing construction for exceptional strength and durability
• Optimized 180-degree upper shell grooving design for improved oil film thickness
• High crush design for maximum bearing retention
• Reduced overlay thickness to prevent overlay fatigue
• Enlarged chamfers for greater crankshaft fillet clearance
• Non-flash plated back for improved seating characteristics

Advanced Engineering:

Clevite main bearings utilize an optimized grooving design that balances connecting rod oil supply with maximum load capacity. The 180-degree groove in the upper main shell provides adequate oil flow to connecting rod bearings while the ungrooved lower shell develops the thickest possible oil film for superior load-carrying capacity and extended bearing life.

Performance Series Options:

Clevite offers multiple bearing series to match specific engine requirements. P-Series bearings feature maximum eccentricity and full grooving for high oil flow applications. H-Series bearings provide medium eccentricity with standard 180-degree grooving, ideal for medium to high RPM engines with oversize crankshaft fillets. K-Series bearings incorporate TriArmor moly/graphite coating technology for enhanced protection during start-up and high-load conditions. V-Series bearings utilize lead-indium overlay for superior conformability, while M-Series micro bearings offer extreme conformability for engines experiencing severe crankshaft deflection.

This undersize bearing set is precision-manufactured to restore proper clearances on reground crankshafts, ensuring optimal performance and longevity in rebuilt performance engines.