Description:Ring gears, such as part 584-4242, are commonly used in planetary gear sets of final drives.All Cat gears have unique metallurgy compositions tailored to specific applications, with special steel formulas that improve impact resistance and ensure uniformity and proper load transfer. Some Cat gears also undergo proprietary heat treat processes to improve surface, bore, and core hardness. The result is greater durability, which means longer life and better performance.Attributes:• Hardened steel ring gear• Number of Teeth: 81• Pitch Diameter: 567 mm (22.32 in)• Internal Spline Number of Teeth: 81• Inside Diameter: 563.6 mm (22.19 in)• Outside Diameter: 637 mm (25.08 in)• Width: 166.75 mm (6.56 in)Application:Consult your owner's manual or contact your local Cat Dealer for more information.