Crankshaft

A crank is a mechanical component that converts reciprocating linear motion into rotary motion, or vice versa. Typically forged from steel or ductile iron, it consists of a crank arm, crankpin, and main bearing journals. Precision machining ensures proper balance and alignment. Common applications include engine crankshafts, pedal mechanisms, piston-driven pumps, and manual winches. The crank's geometry determines stroke length and torque output. Heat-treated surfaces provide wear resistance at bearing interfaces. Reliable and robust, the crank is fundamental to power transmission in internal combustion engines and reciprocating machinery.