Husqvarna 539910008 Woodruff Key No. 6

Product Description

The HUSQVARNA 539910008 is a No. 6 Woodruff key used to secure rotating components to a shaft in outdoor power equipment. Woodruff keys fit into a matching keyway on both the shaft and the mating hub, preventing relative rotation between the two parts during operation. This style of key is commonly found in lawn and garden equipment drivetrains, including blade engagement systems and engine-to-deck connections. Installation and replacement are typically performed by small-engine technicians and outdoor power equipment service professionals.

This part is suited for lawn and garden applications where a Woodruff-style keyed shaft connection is specified. It is used as a service replacement when an original key is sheared, worn, or lost during routine maintenance or blade impact events. Sheared Woodruff keys are one of the most common results of blade strike damage and are a standard item in drivetrain service procedures for walk-behind and riding mowers.

Key Features

• Woodruff key profile for positive shaft-to-hub torque transfer
• No. 6 size designation for precise keyway fitment
• Direct OEM replacement part for HUSQVARNA lawn and garden equipment
• Commonly replaced after blade strike or impact events

Compatibility

Designed as an OEM-style replacement Woodruff key for HUSQVARNA lawn and garden power equipment where a No. 6 Woodruff key is specified.

Installation Notes

Installation should be performed by a qualified small-engine or outdoor power equipment technician. Disconnect the spark plug wire and ensure the engine is fully stopped before servicing any shaft or blade components. The key must be fully seated in the shaft keyway before the mating hub or blade adapter is installed and torqued. Inspect the keyway on both the shaft and hub for damage before installing the replacement key.

Technical Specifications

• Key Type: Woodruff No. 6

Standard Information

• Brand: HUSQVARNA
• Manufacturer Part Number: 539910008