Description:Damper hub used to connect the damper adapter to the pump drive shaft and to decrease the vibration of the rapidly rotating pump drive shaft.Attributes:• Hardened steel damper hub• End 1 Internal Spline Number of Teeth: 20• End 2 Internal Spline Number of Teeth: 48• Outside Diameter: 124 mm (4.8818 in)• Width: 64.5 mm (2.539 in)Application:Consult your owner's manual or contact your local Cat Dealer for more information.