Woodruff Keys

A Woodruff key, also known as a half-moon key or a Woodruff keyseat, is a type of fastener used to secure rotating machine parts to a shaft. It is named after its inventor, William Woodruff. Woodruff keys are commonly used in applications where the transmitted torque between the shaft and the component (such as a gear, pulley, or sprocket) needs to be precise and secure. Here are the key features and characteristics of a Woodruff key fastener: Shape: A Woodruff key is typically shaped like a half-moon or semicircular disc with a flat side and a curved side. Keyseat: The shaft is machined with a specific keyseat or keyway that matches the shape and dimensions of the Woodruff key. This keyseat prevents the key from rotating along the shaft. Keyed Component: The component (e.g., gear or pulley) that needs to be attached to the shaft has a matching keyway that allows the Woodruff key to fit into it. Positioning: The Woodruff key is inserted into the keyway on the shaft, and the component is slid onto the shaft over the key. The key prevents the component from rotating independently of the shaft. Secure Attachment: When the component is in place, the Woodruff key acts as a mechanical stop, ensuring that the component and the shaft rotate together, transmitting torque from the shaft to the component. Common Applications: Woodruff keys are often used in automotive applications, industrial machinery, and other mechanical systems where precise alignment and secure torque transmission are essential. Woodruff keys are designed to provide a secure and accurate connection between the shaft and the component while allowing for easy disassembly and reassembly when needed. They are commonly used when a component must be mounted at a specific angle or when a fixed position is required on the shaft.