Product Description
**Milwaukee parts change not only by model# but also by serial number. To look up your tools parts break down on Milwaukee's website please click here:
Milwaukee Rev Female Coupling
Model Number: 42-90-0170
The Milwaukee 42-90-0170 is a genuine OEM Rev Female Coupling replacement component for compatible Milwaukee power tools — a precision-machined coupling component used in the reversing mechanism, spindle, or output interface of Milwaukee tools where a female coupling interface is part of the drive train or reversing system. Female coupling components in Milwaukee tool drive trains transmit rotational torque between adjoining drive components while providing the mechanical engagement geometry for directional control in reversing tools or the positive drive engagement needed for secure power transmission through the coupling interface. When a female coupling wears, develops excessive clearance, becomes damaged from impact loading, or fails from metal fatigue under torque cycling, the drive train loses the precise engagement needed for accurate torque transmission, and the coupling must be replaced to restore the tool's correct operational characteristics.
Using a genuine Milwaukee OEM replacement coupling ensures the correct dimensional tolerances, material specification, and geometry for proper engagement with mating drive components in the specific tool assembly. Coupling dimensions in precision drive train applications must match their mating components within close tolerances to provide the positive engagement and minimal backlash needed for accurate tool operation — aftermarket couplings with incorrect tolerances produce excessive clearance that causes drive train slop, noise, and accelerated wear in both the coupling and its mating components. Always verify your specific Milwaukee tool's model number and serial number at milwaukeetool.com or by reference to the service parts diagram for your tool before ordering, as coupling specifications are unique to each tool model and production revision.
Features
- Genuine Milwaukee OEM coupling — correct dimensions and tolerances for tool drive train
- Restores precise engagement and minimal backlash in reversing mechanism or drive interface
- Replace when coupling shows wear, damage, or clearance affecting drive train accuracy
- Specifications are model and serial number specific — verify before ordering
- Consult milwaukeetool.com parts lookup or service diagram for correct part number
Specifications
- Type: Rev Female Coupling
- Compatible Tools: Milwaukee Power Tools (verify model and serial number)
Includes
- (1) Milwaukee 42-90-0170 Rev Female Coupling
