Heidelberg Bearing INA HF3520 Heidelberg Bearing INA HF3520 is a high-quality bearing component designed for Heidelberg offset machinery. We provide professional, experienced mechanical maintenance solutions and spare parts replacement for various Heidelberg models including SM/CD 102, XL105, SM/CD/CD 74, XL75, SM/PM52, and MO. High-Quality Component: Specifically engineered for Heidelberg offset machinery. Stock Availability: Most Heidelberg Bearings are available in stock.