Federal Mogul 5107M30 Crankshaft Main Bearing Set Undersize - 0.030

The Federal Mogul 5107M30 is a complete crankshaft main bearing set ground to 0.030" undersize, designed for engine rebuilds where the crankshaft journals have been reground to restore proper bearing clearance. Sold under the Federal Mogul / Sealed Power brand, this set is engineered for both OEM-replacement and performance rebuilds.

Key Features:

• Tri-metal, copper-lead construction for superior durability, corrosion resistance, and fatigue strength
• 0.030" (0.762mm) crankshaft undersize — designed for use with crankshafts reground 0.030" below the original journal diameter
• High-strength steel backing with H-14 overlay material for unsurpassed load-carrying capability
• Engineered to maintain precise oil clearances critical to proper lubrication and long engine life
• Tested for OEM fitment accuracy and performance application demands
• Available as a complete set for full engine rebuild coverage

Federal Mogul is a longtime OEM and aftermarket supplier of engine bearings. These main bearing sets are produced to tight manufacturing tolerances to ensure consistent oil clearance and reliable crankshaft support across a wide range of applications. The 0.030" undersize designation makes this set the correct choice when crankshaft journals have been machined down by 0.030" during reconditioning.