KEY - WOODRUFF (Mitsubishi MB1016821)

A damaged woodruff key can cause the driven component to slip or lose timing entirely. During inspection, a worn or sheared key often reveals itself through unusual play or misalignment. The woodruff key type provides a positive mechanical lock between a shaft and a hub, preventing rotational movement. This aftermarket replacement part references Mitsubishi as the OE maker and carries the cross-reference number MB1016821. A common failure consequence is sudden power loss or erratic operation when the key fails under load. Keeping a woodruff key in sound condition helps maintain consistent torque transmission between connected parts. Verify the serial number or application, then call (562) 693-7748.

Part number variants: MB1016821, mb1016821