Full definition
A pulley manufactured from gray cast iron, the most common material for industrial V-belt and flat belt pulleys due to its excellent machinability, inherent vibration damping (10x better than steel), good wear resistance, and cost-effectiveness. Standard grades: GG25 (EN-GJL-250) with 250 MPa tensile strength, or GG30 for higher-duty applications. Cast iron pulleys are produced by sand casting with subsequent machining of bore, grooves, and mounting surfaces. Limitations: brittle fracture under impact or sudden shock loads, and a maximum recommended peripheral speed of approximately 33 m/s for solid designs (higher for balanced, safety-factor-verified designs). Not suitable for applications with severe shock, extreme cold (brittle transition), or very large diameters (>1000 mm, where welded steel is preferred). Per ISO 4183, DIN 2211, and material specification EN 1561. Surface finish in grooves: Ra 1.6-3.2 μm. Most economical choice for standard industrial drives up to medium-heavy duty.