A crankshaft assembly (crank shaft assly) is a complete engine component that includes the crankshaft along with connected parts such as main bearings, crank pins, counterweights, and sometimes the flywheel and timing gears, forming a ready-to-install unit for internal combustion engines. This assembly converts the reciprocating motion of pistons into rotational motion to drive the vehicle or machinery while ensuring balance, smooth operation, and efficient power transfer. In India, crankshaft assemblies are supplied for automotive, diesel, marine, and industrial engines, manufactured to precise tolerances with high-strength materials to guarantee durability, reliability, and long service life under demanding operating conditions.