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. Chuck with 5/8 in.-16 Thread
Model Number: 48-66-1381
The Milwaukee 48-66-1381 is a genuine OEM 1/2 in. keyed chuck with 5/8 in.-16 thread for compatible Milwaukee drills and rotary tools that use the 5/8 in.-16 spindle thread mounting specification. The chuck is the fundamental interface between the tool spindle and the drill bit or cutter — chuck condition directly determines hole accuracy, bit concentricity, and the gripping security that prevents bit slippage during drilling under load. A worn chuck with excessive runout, jaw slippage, or damaged thread produces oversized holes with poor dimensional accuracy, allows bit movement that damages the workpiece during hole entry, and creates a safety hazard if gripping force is insufficient to retain the bit against cutting forces. Replacing a worn chuck with this genuine Milwaukee OEM part restores the original specifications for spindle thread fit, jaw gripping range, jaw geometry, and overall chuck runout performance.
The 5/8 in.-16 thread specification is the spindle mounting thread standard used on Milwaukee and other manufacturer drills of this configuration — the thread specification must precisely match the drill spindle's external thread for correct chuck seating, accurate alignment, and safe retention under drilling loads. Using a chuck with an incorrect thread pitch or diameter on a drill spindle creates unsafe engagement that can result in chuck loosening or separation during drilling. Always verify the exact spindle thread specification of your specific Milwaukee drill model and serial number at milwaukeetool.com or from the tool's service parts diagram before ordering any replacement chuck.
Features
- Genuine Milwaukee OEM 1/2 in. keyed chuck with 5/8 in.-16 spindle thread
- Restores accurate bit concentricity and secure gripping for precise, safe drilling
- 5/8 in.-16 thread must match drill spindle exactly — verify before ordering
- Replace when chuck shows excessive runout, jaw slippage, or damaged thread
- Verify tool model and serial number at milwaukeetool.com before ordering
Specifications
- Chuck Capacity: 1/2 in.
- Mounting Thread: 5/8 in.-16
- Type: Keyed
- Compatible Tools: Milwaukee Drills with 5/8 in.-16 Spindle Thread (verify model)
Includes
- (1) Milwaukee 48-66-1381 1/2 in. Chuck with 5/8 in.-16 Thread
