The BEPCO 20230B (also known as 20/2-30B) is a high-quality aftermarket main bearing set designed for various Massey Ferguson tractor models. This set features a 0.51mm (0.020 inch) undersize, ensuring a precise fit for crankshaft refurbishment. Manufactured by BEPCO, a trusted brand for agricultural machinery parts, it provides a reliable replacement for original equipment. This main bearing set is a direct equivalent to several OEM part numbers, including 742137M91 and 742137V91, ensuring compatibility and performance across a wide range of Massey Ferguson equipment.