Keyless Drill Chuck 0.3–3.2mm – Aluminum Body, HSS Jaws, M7 Thread for Electric Grinder & Rotary Tools

Upgrade your rotary tool with this precision keyless drill chuck, designed for fast bit changes and reliable performance. Featuring a durable aluminum alloy body and high-speed steel (HSS) jaws, this chuck delivers strong clamping force and long-lasting durability.

With a 0.3–3.2 mm clamping range, it supports a wide variety of micro drill bits, making it ideal for lapidary work, PCB drilling, engraving, jewelry making, and DIY precision fabrication.

Compatible with M7 × 0.75 mm and M8 × 0.75 mm threaded electric grinders, this chuck is available in short and long versions to match different thread lengths, ensuring a secure and stable fit.

Key Features

• Keyless Design: Quick and tool-free bit changes — no chuck key required for fast, efficient workflow.

• Wide Clamping Range (0.3–3.2 mm): Fits most micro drill bits used in lapidary, jewelry, PCB, and engraving applications.

• Durable Construction: Aluminum alloy body with HSS jaws for precision grip and long service life.

• M7 & M8 Thread Compatibility: Works with the most common rotary tool and electric grinder thread standards.

• Multiple Length Options: Short & long versions available for a secure fit across different thread lengths.

Specifications

Compatibility & Usage

Compatible with electric grinders and rotary tools featuring:

• M7 × 0.75 mm thread

• M8 × 0.75 mm thread

Length Selection Guide

Important Note

Slight internal movement or rattling may occur when the chuck is not installed. This is normal due to the internal spring mechanism.

✅ Once properly installed and tightened, the chuck will operate smoothly without vibration.

Applications

• Lapidary & Stone Work: Secure grip on sintered diamond burs and grinding points for stone carving and shaping.

• Jewelry Making: Fast bit changes for carbide burs, engraving bits, and polishing tools in bench work.

• Glass Finishing: Compatible with diamond drill bits for drilling and finishing glass and ceramic.

• PCB & Electronics: Precise micro-drilling in circuit boards and prototype electronics builds.

• DIY & Engraving: Versatile chuck for engraving machines, desktop CNC tools, and hobby rotary platforms.

Related Tools

• Machine Accessories — Shaft adapters, backing plates, and motor accessories to complete your setup.

• Diamond Wire Hollow Drill Bits — Ideal for drilling gemstones, glass, and ceramic.

• Sintered Diamond Core Drills — For larger bore drilling in hard stone and glass.

• Jewelry Making Tools — Burs, mandrels, and precision tools for bench jewelers and stone setters.

• Lapidary Grinding & Polishing — Full range of grinding wheels, laps, and polishing tools for stone and gem work.

Why Choose This Keyless Chuck?

• Tool-Free Convenience: Keyless design eliminates the need for a chuck key — change bits in seconds without interrupting your workflow.

• Broad Compatibility: M7 and M8 thread options cover the most common electric grinder and rotary tool spindle standards.

• Precision Grip: HSS jaws deliver consistent, centered clamping across the full 0.3–3.2 mm range — from the finest micro bits to standard 1/8" shanks.

• Right-Size Fit: Short and long versions ensure a secure, wobble-free installation regardless of your tool’s spindle thread length.

Ideal For: Jewelry makers, lapidary artists, gemstone faceters, PCB fabricators, and DIY enthusiasts who demand fast, reliable bit changes with precision clamping.

Explore our full range of machine accessories and diamond drill bits to complete your precision drilling setup. For bulk orders or custom configurations, contact our team for tailored solutions.