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. All HR riveted series chains (sizes 80HR – 120H) contain ballized plates to provide increased bearing area and press fits. 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 Precision Roller ChainHeavy Riveted StandardSeries: HR Series1-1/2 in Pitch0.437 in Pin Diameter4.01 in Pin Length7/8 in Roller Diameter1.425 in Plate Height0.219 in Plate Thickness80 Links2 Strands68000 lb Tensile Strength10 ft Coil Overall LengthCarbon SteelHot Dip Lubricated