Product Description
**Milwaukee parts change not only by model# but also by serial number. To look up your tools parts break down on Milwaukees website please click here:
Milwaukee No. 404 Woodruff Key
Model Number: 06-42-2000
The Milwaukee 06-42-2000 is a genuine OEM No. 404 Woodruff Key for use in compatible Milwaukee tools. A Woodruff key is a semi-circular, flat-sided precision key that fits into a corresponding semi-circular keyway machined into a shaft — with the mating component such as a gear, pulley, fan, or sprocket featuring a rectangular keyway slot that the key also engages. When assembled, the Woodruff key locks the component to the shaft in rotational alignment, ensuring that the shaft and the component rotate together as a single unit and that motor torque is transferred directly without slippage. The No. 404 designation identifies this as a standard ANSI Woodruff key with specific width, diameter, and height dimensions — larger than the No. 202, suited for higher-torque shaft and component interfaces within the tool drivetrain. A missing, sheared, or worn Woodruff key allows the component to rotate independently of the shaft — resulting in loss of drive, irregular performance, or complete drivetrain failure — requiring replacement to restore secure shaft-to-component coupling and reliable drivetrain operation.
Using a genuine Milwaukee OEM Woodruff key ensures the correct No. 404 dimensional specification, material hardness, and keyway fit for the shaft and component it serves. Non-OEM keys may not match the original ANSI dimensional tolerances, leading to excessive play in the keyway or improper load transfer under torque. Always verify your catalog number and serial number on Milwaukee's website before ordering to confirm this is the correct Woodruff key for your specific unit.
Features
- Genuine Milwaukee OEM No. 404 Woodruff key for compatible Milwaukee tools
- Semi-circular key locks gears, pulleys, fans, and sprockets to the shaft in rotational alignment
- Ensures motor torque is transferred directly to the driven component without slippage
- Standard ANSI No. 404 dimensional specification for correct keyway fit
- Verify catalog number and serial number on Milwaukee's website before ordering
Specifications
- Key Type: Woodruff
- ANSI Designation: No. 404
Includes
- (1) Milwaukee 06-42-2000 No. 404 Woodruff Key
