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 1-3/4 inches, an outside diameter of 3-3/4 inches, a hub projection of 1-1/4 inches, and a grease fitting. This tire coupling hub conforms to AGMA class 5 specifications for balance quality and is designed for use with wrapped elastomer pin type tire couplings in industrial equipment. The maximum rated torque capacity is 475 ft-lbs.