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Mini Brass Drill Chuck Shaft Adapter – 5.05mm for CNC Spindle Motors & High-Torque DC Motors
Mini Brass Drill Chuck Shaft Adapter – 5.05mm for CNC Spindle Motors & High-Torque DC Motors
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The Mini Brass Drill Chuck Shaft Adapter – 5.05 mm is designed for larger CNC spindle motors and high-torque DC hobby motors with a 5.05 mm shaft diameter. Precision-machined brass body delivers a secure, wobble-free connection between your motor shaft and collet chuck — suitable for router spindles, desktop engraving machines, and heavy-duty DIY CNC builds requiring a reliable, low-runout chuck interface.
Key Features
Precision-Machined Brass Construction
Solid Brass Body: Machined to tight tolerances for a secure, wobble-free fit between your 5.05 mm motor shaft and collet chuck — minimizing runout and vibration at operating RPM.
Knurled Grip Surface: Textured exterior for positive hand-tightening and secure seating during chuck installation and removal.
5.05 mm Shaft Fit
Fits CNC spindle motors and high-torque DC hobby motors with 5.05 mm shafts — common in desktop router spindles, engraving machines, and heavy-duty DIY CNC builds.
Output bore: 3.17 mm (1/8") — compatible with our Mini Brass Collet Chuck and most third-party mini brass chucks accepting a standard 1/8" input bore.
Universal Chuck Compatibility
Designed to pair directly with our Mini Brass Collet Chuck (3.17 mm bore) — sold separately or as part of the Full Collet Chuck Set.
Also compatible with most third-party mini brass chucks accepting a standard 3.17 mm (1/8") input bore.
Applications
CNC Router & Engraving Machines
Router Spindle Chucks: Attach a collet chuck to high-torque CNC spindle motors for improved tool grip on routing bits and engraving tools in desktop CNC builds.
Desktop Engraving: Secure, low-runout chuck interface for engraving machines using larger DC motors with 5.05 mm shafts.
Lapidary & Glass Finishing
High-Torque Motor Setups: Pairs with larger DC motors for demanding lapidary grinding and glass carving applications where higher torque is required.
Precision Drilling in Hard Materials: Pair with diamond hollow drill bits for clean, chip-free holes in gemstones, glass, and ceramic.
Jewelry Making & Bench Work
High-Torque Motor Integration: Connects 5.05 mm shaft motors to collet chucks for use with carbide burs and engraving bits in jewelry fabrication and metalwork.
Technical Specifications
| Specification | Detail |
|---|---|
| Shaft Bore (Input) | 5.05 mm |
| Chuck Bore (Output) | 3.17 mm (1/8") |
| Material | Solid Brass |
| Compatible Motor Types | CNC spindle motors, high-torque DC hobby motors |
| Typical Applications | CNC router spindles, engraving machines, lapidary, jewelry, glass finishing |
Comparison: Shaft Adapter vs. Full Chuck Set
| Feature | Shaft Adapter (This Listing) | Full Collet Chuck Set |
|---|---|---|
| Contents | 1 × 5.05 mm shaft adapter | Chuck body + 11 collets + 1 adapter + hex key |
| Best For | Replacing or adding a 5.05 mm adapter to an existing chuck | Complete micro-drilling solution from scratch |
| Chuck Required | Yes — sold separately | Included |
Installation
Press the 5.05 mm adapter firmly onto your motor shaft.
Thread or press the collet chuck body onto the adapter’s output end (3.17 mm bore).
Insert the appropriate collet, load your drill bit or bur shank, and tighten with the hex key before operating.
Best Practices
Verify your motor shaft diameter with calipers before ordering — nominal sizes (e.g. “5 mm”) may vary slightly by manufacturer.
Ensure the adapter is fully seated and secure before operating at high RPM to prevent runout or chuck wobble.
When drilling hard materials such as stone or glass, pair with diamond-coated drill bits and use water as a coolant to extend bit life.
Compatible Collet Sizes
This adapter is compatible with the following collet sizes when used with our Mini Brass Collet Chuck:
| Collet Size | Clamping Range |
|---|---|
| 0.5 mm | 0.2 – 0.5 mm |
| 0.8 mm | 0.3 – 0.9 mm |
| 1.0 mm | 0.7 – 1.1 mm |
| 1.2 mm | 0.8 – 1.3 mm |
| 1.6 mm | 1.3 – 1.7 mm |
| 1.8 mm | 1.4 – 1.9 mm |
| 2.0 mm | 1.8 – 2.1 mm |
| 2.4 mm | 2.1 – 2.5 mm |
| 3.0 mm | 2.5 – 3.0 mm |
| 3.2 mm | 2.8 – 3.2 mm |
Related Tools
Mini Brass Collet Chuck Set — The matching chuck body and collet set for use with this adapter.
Diamond Wire Hollow Drill Bits — Ideal for drilling gemstones, glass, and ceramic with your chuck setup.
Sintered Diamond Core Drills — For larger bore drilling in hard stone and glass with superior longevity.
Machine Accessories — Full range of shaft adapters, backing plates, and motor accessories.
Jewelry Making Tools — Burs, mandrels, and precision tools for bench jewelers and stone setters.
Why Choose This Shaft Adapter?
Precision Fit: Machined to tight tolerances for a secure, low-runout connection between your 5.05 mm motor shaft and collet chuck.
High-Torque Motor Coverage: Covers the larger CNC spindle and high-torque hobby motor shaft diameter — ideal for demanding routing and engraving applications.
Immediate Upgrade: Extend the utility of your existing collet chuck to a 5.05 mm motor platform without sourcing custom parts.
Ideal For: DIY CNC builders, desktop engraving enthusiasts, lapidary artists, jewelry makers, and makers upgrading or expanding their precision drilling setup with high-torque motors.
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.