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 1/2 in. Drill Chuck
Model Number: 42-66-0785
The Milwaukee 42-66-0785 is a genuine OEM 1/2 in. Chuck for compatible Milwaukee corded or cordless drills — a replacement chuck assembly that restores the drill's bit retention and concentricity when the original chuck develops runout from wear, loses jaw clamping force, develops slipping jaws that cannot retain bits under load, or is damaged from physical impact. The chuck is the drill's primary bit retention and concentricity-defining component — the three-jaw geometry must grip the bit shank uniformly for the zero-runout condition that produces accurate, clean holes without the wobble and oversized holes that runout causes. Milwaukee's chuck design specifies the correct jaw geometry, cam mechanism, and bore taper for the specific drill model's spindle thread specification.
Replacing the chuck is the economical service approach when the chuck is the only worn or damaged component — a drill body, motor, and gearbox in good condition can provide many additional years of service with a fresh OEM chuck rather than requiring complete tool replacement. Using a genuine Milwaukee OEM chuck ensures the correct spindle thread specification, chuck capacity, and jaw engagement geometry for the specific Milwaukee drill model — a chuck with incorrect spindle thread will not mount correctly on the drill spindle, and incorrect jaw geometry produces inadequate clamping force or runout that defeats the purpose of the replacement. Always verify your specific Milwaukee drill model number and serial number at milwaukeetool.com before ordering chuck service components.
Features
- Genuine Milwaukee OEM chuck — correct spindle thread and jaw geometry for model
- Restores zero-runout bit retention for accurate holes and reliable bit clamping
- Economical chuck-only replacement vs. complete tool replacement
- Replace when jaws slip, runout develops, or clamping force is inadequate
- Verify Milwaukee drill model and serial number before ordering
Specifications
- Chuck Size: 1/2 in.
- Type: Keyed or Keyless (verify model specification)
- Compatible Tools: Milwaukee Drills (verify model and serial number)
Includes
- (1) Milwaukee 42-66-0785 1/2 in. Drill Chuck
