5.05mm Mini Brass Drill Chuck Shaft Arbor Adapter for CNC Spindle Motors & High-Torque DC Motors

The 5.05mm Mini Brass Drill Chuck Shaft Arbor Adapter is a precision lathe-turned brass adapter engineered to mount mini brass collet chucks onto heavy-duty 5.05mm motor shafts commonly used in desktop CNC routers, milling spindles, and high-torque DC motors.

Key Features

• Engineered for 5.05mm Motor Shafts: Machined to exact internal diameter specifications for a snug, concentric press- or set-screw fit on 5.05mm motor shafts, eliminating axial play and vibration.
• High-Torque Concentric Brass Construction: Solid brass alloy dampens operational chatter, prevents shaft galling, and maintains true rotational centerlines during heavy carving and drilling.
• Standard 3.17mm (1/8") Output Bore: Compatible with standard mini brass collet chucks (0.5–3.2mm capacity) for micro drill bits, diamond points, and rotary burs.
• Corrosion-Resistant Durability: Resists moisture, oxidation, and mechanical fatigue in wet lapidary environments and continuous CNC milling workflows.

Recommended Applications

• Desktop CNC engraving, 3D relief carving, and PCB routing spindles.
• High-torque lapidary core drilling, glass shaping, and stone cutting setups.
• Custom DIY power tool builds and heavy-duty rotary machine conversions.

Technical Specifications

Installation & Operating Guidelines

• Ensure the 5.05mm motor shaft is completely clean and burr-free before installing the adapter.
• Press the adapter squarely onto the shaft until seated against the shoulder.
• Mount the brass collet chuck body, load your cutting bit, and tighten securely.
• Maintain continuous liquid cooling (water or cutting fluid) when cutting hard lapidary materials or glass.