The TB Wood's Tire Coupling Hub is a 4-bolt angular tire coupling hub made of cast iron for industrial power transmission applications. It has a bore size of 1-3/16 inches, an outside diameter of 3-1/2 inches, a hub projection of 1-5/8 inches, and a grease fitting. This tire coupling hub conforms to AGMA class 5 specifications for balance quality and is designed for a maximum speed of 650 RPM. The coupling hub can be used to connect shafts in engine or motor applications.