Keyless Drill Chuck 0.3–3.2mm Arbor Adapter – Aluminum Body, M8 Thread for Rotary Tools

The Keyless Drill Chuck 0.3–3.2mm Arbor Adapter (M8 Thread) is a quick-change, keyless clamping chuck engineered for rotary tools, flex shafts, and electric die grinders with standard M8 threaded drive spindles.

Key Features

• Universal Clamping Range (0.3–3.2mm): Fast, tool-free bit changes without swapping collets. Securely clamps micro drill bits, diamond burs, polishing wheels, and carving points across continuous diameters from 0.3mm up to 3.2mm.
• Hardened High-Speed Steel (HSS) Jaws: 3-jaw precision mechanism provides concentric, balanced tool grip with superior wear resistance against slipping or jaw galling.
• Lightweight Anodized Aluminum Alloy Body: Keeps spindle weight minimal to reduce centrifugal strain on high-RPM rotary motor bearings.
• Standard M8 Thread Fit: Direct screw-on compatibility with M8 threaded rotary tool output shafts (M8 x 0.75mm pitch).
• Textured Knurled Barrel: Diamond knurling provides high hand-tightening torque without requiring wrenches or collet keys.

Recommended Applications

• Lapidary gemstone drilling, micro-carving, and cabochon polishing.
• Jewelry fabrication, hole drilling, and stone setting detailing.
• PCB prototyping, hobby crafting, and fine precision model making.

Technical Specifications

Operating & Maintenance Guidelines

• Verify that your rotary tool spindle thread is M8 (approximately 7.8–8.0mm outer diameter) before threading on the chuck.
• Hand-tighten firmly onto the tool shank; do not use pliers or heavy wrenches on the aluminum knurled barrel.
• Periodically blow out lapidary slurry and dust from the internal 3-jaw mechanism and apply a drop of light machine oil to maintain smooth movement.