0.4-3.2mm Keyless Mini Drill Chuck M7×0.75 / M8×0.75 Thread

0.4-3.2mm Keyless Mini Drill Chuck M7×0.75 / M8×0.75 Thread

Product Overview

Tool-free keyless mini drill chuck for small rotary grinding tools, two standard thread sizes optional (M7×0.75, M8×0.75). Wide 0.4–3.2mm clamping range fits most tiny drill bits, polishing burs and carving accessories. Knurled twist grip allows fast bit replacement without spanner. Heat treated metal body with anti-rust black oxide coating for long workshop service life.

Core Key Advantages

• Tool-free keyless design, no wrench needed for quick bit swap
• Wide 0.4~3.2mm clamping range for multi-size tiny bits
• Two thread options: M7×0.75 / M8×0.75 for most mini rotary tools
• Knurled outer sleeve for easy hand tightening & loosening
• Heat treated alloy body, wear & rust resistant oxide finish
• Compact mini size for engraving, polishing & DIY carving work

Full Technical Specifications

Model SKU	MZ006372
Clamping Range	0.4mm ~ 3.2mm
Optional Thread	M7×0.75 / M8×0.75
Body Material	Heat Treated Alloy Steel
Surface Treatment	Anti-Rust Black Oxide Coating
Feature	Knurled Keyless Twist Grip
Application	Mini Rotary Grinder / Engraving Tool

Wide Application Scenarios

• Jewelry carving & polishing burs holder
• Wood DIY miniature engraving work
• Metal mold tiny grinding & drilling
• Electronic component trimming tools
• Home hobby mini rotary tool spare part

Installation & Usage Tips

1. Match thread size (M7 or M8) with your rotary machine before installation.
2. Twist knurled sleeve clockwise to lock drill bit firmly.
3. Avoid excessive high torque to prevent chuck thread damage.
4. Wipe dust regularly to keep smooth clamping performance.

Package Contents

• 1 × Keyless Mini Drill Chuck (Selected Thread Size)
• Multilingual Specification Card

Frequently Asked Questions

Q1 What clamping range does this chuck support?

A1 Fits bits from 0.4mm up to 3.2mm diameter.

Q2 What thread sizes are available?

A2 Two options: M7×0.75 and M8×0.75 standard thread.

Q3 Does it need a wrench to tighten bits?

A1 No keyless twist design, tool-free operation.

Q4 What machines does this chuck fit?

A2 Most standard mini rotary engraving & grinding tools with matching thread.

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