Steel Single/Double Sprocket Roller Product Features: Welding the steel sprocket to the steel tube gives it the capacity to transmit high torque and meet the requirements for heavy duty transportation. The precision ball bearing is pressed tightly into the steel bearing housing for maximum durability. The environmental working conditions are broad. They can be used in both high and low temperature applications. The covering on the outside of the sprocket protects the bearings by providing excellent resistance to dust. Temperature range: -20°C – +80°C. Specifications: Bearing Unit Bearing housing Steel, zinc plated Precision ball bearing 6001/6202/6204 Ground Sleeve Polyamide, black Drive Element Sprocket Steel 2311/2321 Series Load Capacity 2311 Series Internal Thread