Milwaukee 42-66-1006 Keyless Service Chuck, 1/2 Inch, 9/16-18 Internal Thread, Replacement for Select M18 Hammer Drills
- Milwaukee 42-66-1006 is a 1/2 inch keyless service chuck for select M18 hammer drills. It is an OEM replacement part used on models such as 2704-20 and 2804-20; the chuck installs with the left hand T-40 chuck screw (05-88-0019) specified in the service lists.
- Features:
- OEM replacement for Milwaukee M18 hammer drills including catalog numbers 2704-20 and 2804-20 for proper fit and runout control, verified in service parts lists.
- Keyless design enables fast, tool free bit changes to reduce downtime on drilling tasks.
- Carbide jaw construction (as listed) supports strong bit grip under hammer drilling loads.
- Installs using the specified left hand T-40 chuck screw (05-88-0019) for secure retention per Milwaukee procedure.
- Internal mounting thread 9/16-18 documented by trusted parts distributors for compatibility confirmation.
- Specifications:
- Manufacturer: Milwaukee Tool
- Part Number: 42-66-1006
- Type: keyless drill chuck, service replacement
- Size / Capacity: 1/2 inch chuck (jaw capacity per tool specification)
- Mount / Thread: internal 9/16-18
- Compatible Systems / Fitment: OEM chuck listed for M18 hammer drill catalog numbers 2704-20 and 2804-20 (see Milwaukee service parts lists); replaces the chuck on these tools
- Retaining Screw: 05-88-0019 M8 x 1 left hand T-40 chuck screw (used to secure the chuck on listed models)
- The service chuck can also be referred to as keyless drill chuck, 1/2 inch replacement chuck, Milwaukee M18 hammer drill chuck, 9/16-18 threaded chuck, and Milwaukee 42-66-1006 chuck.
Milwaukee Tool manufactures professional power tools, hand tools, and accessories for construction, mechanical, and industrial trades, with extensive support for OEM service parts and repair documentation.
Q: Which models is this chuck verified to fit?
A: It is listed in Milwaukee service parts documentation for M18 hammer drills catalog 2704-20 and 2804-20. Check your tool’s catalog and serial number against the service parts list to confirm.
Q: What mounting thread does the chuck use?
A: The internal mounting thread is 9/16-18, as documented by reputable parts distributors for this OEM chuck.
Q: How is the chuck secured on the drill?
A: Install per Milwaukee’s procedure and secure with the left hand T-40 chuck screw 05-88-0019 specified in the service parts lists for the listed models.
