Mercury - Flange-yoke - 52504. The Mercury Flange-Yoke - 52504 is a precision-engineered OEM replacement component, built to deliver dependable power transmission between your marine engine and drive system. Designed to meet Mercury's exacting standards, this flange-yoke ensures optimal alignment and durability under demanding marine conditions.. Key Features. Genuine Mercury OEM Part - Ensures proper fit, performance, and longevity. High-Torque Transfer - Engineered to handle high load and rota