Milwaukee 42-90-0020 Coupler

**Milwaukee parts change not only by model# but also by serial number. Milwaukee’s site lets youlook up your tool’s parts diagram.Milwaukee CouplerModel Number: 42-90-0020The Milwaukee 42-90-0020 is a genuine OEM Coupler for compatible Milwaukee power tools a precision-machined mechanical coupling component that connects two rotating or reciprocating shaft sections, transmitting torque or reciprocating motion from the drive element to the driven element at the coupler’s position in the tool’s mechanism. Couplers in Milwaukee tools serve the critical function of maintaining the mechanical linkage between power transmission components the coupler must transmit the rated torque or force loads of tool operation without slipping, flexing beyond the design specification, or developing play that changes the positional relationship between the coupled components. When a coupler wears from sustained operational loads, cracks from shock loading or impact damage, or develops excessive play at its interface contacts, the mechanical linkage it maintains degrades and the tool’s performance and precision are compromised.Using a genuine Milwaukee OEM coupler ensures the correct coupling geometry, bore dimensions, keyway or flat specifications, and material for the specific Milwaukee tool model and mechanism position a coupler with incorrect dimensions would not maintain the precise shaft alignment and torque transmission geometry that the Milwaukee tool’s mechanism requires for proper operation. Always verify your specific Milwaukee tool model number and serial number at milwaukeetool.com before ordering coupler service components, as coupler specifications are unique to each tool model and mechanism design.FeaturesGenuine Milwaukee OEM coupler for compatible Milwaukee power toolsMaintains mechanical linkage for torque and motion transmission between shaft sectionsReplace when coupler wears, cracks, or develops play at interface contactsCorrect bore and coupling geometry critical for shaft alignment and torque transmissionVerify tool model and serial number at milwaukeetool.com before orderingSpecificationsType: CouplerCompatible Tools: Milwaukee Power Tools (verify model and serial number)Includes(1) Milwaukee 42-90-0020 Coupler