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Mini Brass Drill Chuck Shaft Adapter – 3.17mm (1/8") for Dremel, Foredom & Rotary Tools
Mini Brass Drill Chuck Shaft Adapter – 3.17mm (1/8") for Dremel, Foredom & Rotary Tools
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The Mini Brass Drill Chuck Shaft Adapter – 3.17 mm (1/8") is the universal standard adapter for connecting a brass collet chuck to Dremel-style rotary tools, Foredom flex-shaft handpieces, and WEN-equivalent rotary platforms. The most widely used shaft size in lapidary, jewelry bench work, and glass finishing — fits directly without modification.
Key Features
Precision-Machined Brass Construction
Solid Brass Body: Machined to tight tolerances for a secure, wobble-free fit between your 3.17 mm (1/8") 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.
3.17 mm (1/8") Shaft Fit — The Universal Standard
Fits Dremel, WEN, Foredom, and equivalent rotary tools and flex-shaft handpieces — the most widely used shaft diameter in lapidary, jewelry, and glass finishing applications.
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
Lapidary & Glass Finishing
Flex-Shaft Compatibility: Integrates directly with Foredom and equivalent flex-shaft handpieces for bench-top lapidary carving and stone work.
Rotary Tool Integration: Attach a collet chuck to Dremel-style tools for improved grip on sintered diamond points and glass grinding burs.
Jewelry Making & Precision Bench Work
Bur & Engraving Bit Grip: Secure collet-based clamping on fine carbide burs for detailed metalwork, stone setting, and faceting tool maintenance.
Dremel-Style Rotary Tools: The 3.17 mm adapter is the direct-fit standard for Dremel, WEN, and equivalent brands — no modification required.
Electronics, PCB & DIY Fabrication
Micro Drill Presses: Compatible with benchtop micro drill press spindles accepting 3.17 mm shafts — common in PCB and electronics fabrication setups.
CNC Spindle Motors: Suitable for low-power CNC router spindles and engraving machines with 3.17 mm motor shafts.
Technical Specifications
| Specification | Detail |
|---|---|
| Shaft Bore (Input) | 3.17 mm (1/8") |
| Chuck Bore (Output) | 3.17 mm (1/8") |
| Material | Solid Brass |
| Compatible Motor Types | Dremel, WEN, Foredom, flex-shaft handpieces, micro drill presses |
| Typical Applications | Lapidary, jewelry, glass finishing, PCB drilling, CNC engraving |
Comparison: Shaft Adapter vs. Full Chuck Set
| Feature | Shaft Adapter (This Listing) | Full Collet Chuck Set |
|---|---|---|
| Contents | 1 × 3.17 mm shaft adapter | Chuck body + 11 collets + 1 adapter + hex key |
| Best For | Replacing or adding a 3.17 mm adapter to an existing chuck | Complete micro-drilling solution from scratch |
| Chuck Required | Yes — sold separately | Included |
Installation
Press the 3.17 mm adapter firmly onto your rotary tool or 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 tool shaft diameter with calipers before ordering — nominal 1/8" sizes 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?
Universal Standard: 3.17 mm (1/8") is the most widely used shaft size across Dremel, Foredom, and equivalent rotary tool platforms — the safest choice for most lapidary and jewelry setups.
Precision Fit: Machined to tight tolerances for a secure, low-runout connection between your rotary tool and collet chuck.
Immediate Upgrade: Extend the utility of your existing collet chuck to any 3.17 mm rotary tool platform without sourcing custom parts.
Ideal For: Jewelry makers, lapidary artists, gemstone faceters, PCB fabricators, 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.