Description:Couplings are a key component in the planetary assemblies of Cat drive train systems. Cat designs and manufactures its transmissions and final drive components to endure high torque and impact loads along with frequent direction and gear changes. The result is a drive train that lasts longer and works harder over the life of the machine.Attributes:• Material: Hardened Steel• External Spline Number of Teeth: 138• Internal Spline Number of Teeth: 98Application:Cat couplings are used in the planetary assemblies of Cat transmissions. Consult your owner’s manual or contact your local Cat Dealer for more information.