All HR series chains are designed with a wide waist contour and a heavy side plate to improve stress distribution, increase fatigue strength and reduce vibration. This special ballizing process is after heat treatment which is a key to achieving the maximum residual compressive stress. This improves fatigue life and increases working load capacities.Drives Silver Shield CR Precision Roller ChainHeavy Riveted StandardSeries: HR Series3/4 in Pitch0.234 in Pin Diameter1.14 in Pin Length0.469 in Roller Diameter0.709 in Plate Height1/8 in Plate Thickness1 Strands8500 lb Tensile Strength10 ft Coil Overall LengthCarbon SteelZinc-Aluminum