Milwaukee 06-42-2000 404 Woodruff Key

**Milwaukee parts change not only by model# but also by serial number. Milwaukee’s site lets youlook up your tool’s parts diagram.Milwaukee No. 404 Woodruff KeyModel Number: 06-42-2000The 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.FeaturesGenuine Milwaukee OEM No. 404 Woodruff key for compatible Milwaukee toolsSemi-circular key locks gears, pulleys, fans, and sprockets to the shaft in rotational alignmentEnsures motor torque is transferred directly to the driven component without slippageStandard ANSI No. 404 dimensional specification for correct keyway fitVerify catalog number and serial number on Milwaukee’s website before orderingSpecificationsKey Type: WoodruffANSI Designation: No. 404Includes(1) Milwaukee 06-42-2000 No. 404 Woodruff Key