SD.20.B

Medium size single row four-point contact ball slewing bearings are indeed capable of operating at circumferential speeds up to 4 m/s. These types of bearings are designed to support axial, radial, and moment loads simultaneously while allowing rotational movement. The maximum operating speed depends on various factors including bearing size, design, lubrication, and application conditions. For medium size single row four-point contact ball slewing bearings, 4 m/s is within the typical operational range. It's important to ensure proper lubrication and maintenance to achieve optimal performance and longevity at these speeds. Additionally, specific application requirements and environmental conditions should always be considered when selecting and operating slewing bearings to ensure safe and efficient performance.