Eccentric Shafts & Crank Shafts

Crankshafts are manufactured through advanced forging and machining processes that ensure dimensional accuracy and reliable performance under extreme loads. The forging process shapes high-strength metals — such as carbon steel or stainless steel — into the precise crank throws and journals that define a crankshaft's geometry. After forging, machining operations bring the component to exact customer-specified tolerances and surface finishes, making the crankshaft ready for demanding applications in automotive engines and piston-driven machinery.

Three widely recognized forging methods are open-die forging, which shapes metal between flat dies with minimal restriction; closed-die (impression-die) forging, which uses precision-shaped dies to achieve tighter geometries; and cold forging, which forms metal at room temperature to achieve very tight dimensional tolerances. Krupa Services applies advanced forging techniques alongside precision machining to produce eccentric shafts and crankshafts engineered for high-load industrial applications.

An eccentric shaft is a rotating shaft in which the axis of rotation is offset from the geometric center of one or more of its circular features. This offset creates a controlled, repetitive motion used to drive mechanisms such as crushers, compressors, and reciprocating machinery. Eccentric shafts are widely used in automotive, mining, and industrial equipment to convert rotational motion into linear or oscillating force.

An eccentric shaft features a cylindrical section whose center is offset from the shaft's rotational axis, producing a cam-like motion ideal for crushers and compressors. A crankshaft converts rotational motion into linear reciprocating motion through its crank throws and journals, and is most commonly found in internal combustion engines and piston-driven machinery. Both are precision-forged components requiring tight dimensional control.

Eccentric and crank shafts can be manufactured from a variety of metals depending on application requirements. Common materials include carbon steel, stainless steel, brass, copper, and aluminum. Steel and stainless steel are preferred for high-strength, high-torque applications such as automotive and mining equipment, while aluminum offers a lightweight alternative for less demanding or weight-sensitive applications.

Yes. Krupa Services offers full customization of eccentric and crank shafts based on customer-supplied specifications. This includes material selection, dimensional tolerances, surface finishes, and geometry. Whether you require prototypes for component development or high-volume production runs, the engineering team can work with you to deliver components that meet your exact technical and performance requirements.

Eccentric shafts and crankshafts are critical components across multiple industries. They are used in automotive transmission systems, mining and crushing equipment, construction machinery, agricultural equipment such as tractors and harvesters, industrial machinery, and off-highway vehicles. Their ability to convert rotational motion into precise oscillating or reciprocating force makes them indispensable in any application requiring controlled mechanical movement.