Big-end bearings, code 50601, are essential load-bearing components connecting the connecting rod to the crankshaft in the MAN L21/31 engine. These precision bearings are designed to withstand high dynamic loads, rotational speeds, and continuous lubrication demands while ensuring smooth crankshaft motion. Their accurate fit and advanced bearing materials reduce friction and wear, protect the crankshaft journals, and play a key role in maintaining engine reliability, efficiency, and long service life under heavy-duty marine and stationary operating conditions.