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Mini Brass Drill Chuck Shaft Adapter – 2.35mm for Micro Drill Press & Compact DC Motors
Mini Brass Drill Chuck Shaft Adapter – 2.35mm for Micro Drill Press & Compact DC Motors
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The Mini Brass Drill Chuck Shaft Adapter – 2.35 mm is a precision-machined adapter designed to connect your brass collet chuck to micro drill press spindles and compact DC hobby motors with a 2.35 mm shaft diameter. A direct-fit solution for PCB fabrication, electronics prototyping, and fine lapidary or jewelry drilling setups — no custom machining required.
Key Features
Precision-Machined Brass Construction
Solid Brass Body: Machined to tight tolerances for a secure, wobble-free fit between your 2.35 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.
2.35 mm Shaft Fit
Fits micro drill press spindles and compact hobby motors commonly used in PCB drilling, electronics fabrication, and fine bench work.
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
Electronics, PCB & DIY Fabrication
PCB Drilling: Precise, clean holes in circuit boards without delamination or bit wander — essential for prototype electronics builds using compact hobby motors.
Hobby & Maker Projects: Ideal for Arduino/Raspberry Pi enclosures, RC components, scale models, and miniature assemblies requiring sub-millimeter accuracy.
Lapidary & Glass Finishing
Compact Motor Setups: Pairs with small DC motors for lapidary grinding and glass finishing applications where a low-profile motor is preferred.
Micro Drill Press Spindles: Fits compact benchtop drill press spindles used in jewelry fabrication and stone setting work.
Technical Specifications
| Specification | Detail |
|---|---|
| Shaft Bore (Input) | 2.35 mm |
| Chuck Bore (Output) | 3.17 mm (1/8") |
| Material | Solid Brass |
| Compatible Motor Types | Micro drill press spindles, compact DC hobby motors |
| Typical Applications | PCB drilling, electronics fabrication, lapidary, jewelry |
Comparison: Shaft Adapter vs. Full Chuck Set
| Feature | Shaft Adapter (This Listing) | Full Collet Chuck Set |
|---|---|---|
| Contents | 1 × 2.35 mm shaft adapter | Chuck body + 11 collets + 1 adapter + hex key |
| Best For | Replacing or adding a 2.35 mm adapter to an existing chuck | Complete micro-drilling solution from scratch |
| Chuck Required | Yes — sold separately | Included |
Installation
Press the 2.35 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. “2 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 2.35 mm motor shaft and collet chuck.
Immediate Upgrade: Extend the utility of your existing collet chuck to a 2.35 mm motor platform without sourcing custom parts.
Broad Tool Compatibility: Works with diamond drill bits, carbide burs, engraving bits, and standard twist drills across stone, glass, metal, plastic, and PCB materials.
Ideal For: Jewelry makers, lapidary artists, PCB fabricators, model builders, and electronics makers upgrading or expanding their precision drilling setup.
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.