4.05mm Mini Brass Drill Chuck Shaft Arbor Adapter for 550 & 775 DC Motors & DIY CNC

The 4.05mm Mini Brass Drill Chuck Shaft Arbor Adapter is a precision lathe-turned brass coupling adapter designed to mount mini brass collet chucks onto 4.05mm motor shafts commonly found on 550 and 775 series DC hobby motors and desktop CNC machines.

Key Features

• Engineered for 4.05mm Motor Shafts: Machined to exact tolerances for a rigid, concentric fit on 4.05mm shafts used in mid-range DC motors, DIY engravers, and hobby CNC spindles.
• Vibration-Damping Solid Brass: Precision lathe turning minimizes runout, shaft wobble, and rotational vibration even under elevated motor speeds and drilling torque.
• Standard 3.17mm (1/8") Output Bore: Couples directly to mini brass collet chucks (0.5–3.2mm clamping capacity) for twist drills, diamond burs, and carving points.
• Wear & Corrosion Resistance: Solid brass alloy resists rust, galling, and environmental oxidation during wet lapidary or machining operations.

Recommended Applications

• Custom DIY lapidary grinding, stone coring, and glass engraving motor builds.
• Desktop CNC router engraving, PCB drilling, and prototype fabrication.
• Hobby power tool retrofits and multi-axis modeling projects.

Technical Specifications

Installation & Operating Guidelines

• Slide the adapter firmly onto the clean 4.05mm motor shaft until fully seated against the shoulder.
• Thread or press the collet chuck body onto the output end of the adapter.
• Insert the matching collet, seat your tool shank, and secure tightly using the collet nut.
• Always supply adequate water coolant when drilling stones, glass, or ceramic materials.