King Engine Bearings MB624XA0.5 Main Bearing Set Undersize - 0.50mm

The King Engine Bearings MB624XA0.5 is a main bearing set in a +0.50mm undersize dimension, designed for use with crankshafts that have been re-ground to a 0.50mm undersize specification. This bearing set is engineered to restore precise oil clearances during engine rebuilds where standard-size bearings are no longer suitable.

King Engine Bearings are manufactured to exacting tolerances, with wall thickness held to ±0.0001" — significantly tighter than industry-standard tolerances — ensuring consistent fitment and reliable performance across the full bearing set.

Key Features:

• +0.50mm undersize for use with re-ground crankshafts
• Precision wall thickness tolerance of ±0.0001" for consistent oil clearance
• High-quality bi-metal construction on a steel backing for strength and embedability
• Designed for proper oil wedge formation and stable hydrodynamic lubrication
• Engineered to reduce bearing and housing distortion during operation
• Manufactured by a dedicated engine bearing specialist with decades of engineering expertise

King Engine Bearings focuses exclusively on engine bearings, allowing them to refine materials, designs, and manufacturing processes to a degree that general parts manufacturers cannot match. The MB624XA0.5 main bearing set is an ideal solution for engine rebuilders working with re-ground crankshafts who require a precise, reliable, and durable main bearing.