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Mini Brass Drill Chuck Shaft Adapter – 2.35mm for Small DC Motors & Rotary Tools

Mini Brass Drill Chuck Shaft Adapter – 2.35mm for Small DC Motors & Rotary Tools

$8.55 USD
$8.55 USD
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The Mini Brass Drill Chuck Shaft Adapter is a precision-machined replacement and upgrade adapter designed to connect your brass collet chuck to small DC motors and rotary tool spindles. Available in four standard shaft diameters — 2.35 mm, 3.17 mm, 4.05 mm, and 5.05 mm — this adapter eliminates the need for custom machining when pairing a collet chuck with hobby motors, Dremel-style tools, Foredom flex-shaft systems, or CNC spindles used in jewelry making, lapidary work, glass finishing, and DIY precision fabrication.

Key Features

Precision-Machined Brass Construction

  • Solid Brass Body: Machined to tight tolerances for a secure, wobble-free fit between your 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.

Four Standard Shaft Sizes

  • 2.35 mm: Fits micro drill press spindles and compact hobby motors common in PCB and electronics fabrication setups.

  • 3.17 mm (1/8"): The universal standard for Dremel, WEN, Foredom, and equivalent rotary tools — the most widely used shaft size in lapidary and jewelry bench work.

  • 4.05 mm: Compatible with mid-range DC hobby motors including select 550 and 775 series motors used in DIY CNC and engraving machines.

  • 5.05 mm: Fits larger CNC spindle motors and high-torque hobby motors used in router and engraving applications.

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

  • Motor Shaft Upgrades: Swap shaft adapters to repurpose existing motors for new chuck configurations — ideal for lapidary grinding and glass carving setups.

  • Flex-Shaft Compatibility: The 3.17 mm adapter integrates directly with Foredom and equivalent flex-shaft handpieces for bench-top lapidary and stone carving work.

Jewelry Making & Precision Bench Work

  • Rotary Tool Integration: Attach a collet chuck to Dremel-style tools via the 3.17 mm adapter for improved grip on fine burs, engraving bits, and sintered diamond points.

  • Micro Drill Press Spindles: The 2.35 mm adapter fits compact benchtop drill press spindles used in jewelry fabrication and stone setting work.

Electronics, PCB & DIY Fabrication

  • Hobby Motor Builds: Covers the majority of 385, 550, and 775 series DC motor shaft diameters — enabling collet chuck attachment without custom machining or press-fit adapters.

  • CNC & Engraving Spindles: The 4.05 mm and 5.05 mm adapters suit low-power CNC router spindles and desktop engraving machines requiring a secure chuck interface.

Technical Specifications

Shaft Size Common Motor / Tool Type Typical Application
2.35 mm Micro drill press spindles, compact hobby motors PCB drilling, electronics fabrication
3.17 mm (1/8") Dremel, WEN, Foredom, flex-shaft handpieces Lapidary, jewelry, glass finishing
4.05 mm 550 / 775 series DC hobby motors DIY CNC, engraving, hobby builds
5.05 mm CNC spindle motors, high-torque hobby motors Router spindles, engraving machines

Comparison: Shaft Adapter vs. Full Chuck Set

Feature Shaft Adapter (This Listing) Full Collet Chuck Set
Contents 1 shaft adapter (choose size) Chuck body + 11 collets + 1 adapter + hex key
Best For Replacing or adding an adapter to an existing chuck Complete micro-drilling solution from scratch
Chuck Required Yes — sold separately Included
Shaft Sizes Available 2.35 mm, 3.17 mm, 4.05 mm, 5.05 mm One size included per kit

Installation

  • Select the adapter matching your motor shaft diameter and press it firmly onto the 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. “3 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

Why Choose This Shaft Adapter?

  • Precision Fit: Machined to tight tolerances for a secure, low-runout connection between your motor and collet chuck.

  • Broad Compatibility: Four sizes cover the most common DC motor and rotary tool shaft diameters used in lapidary, jewelry, PCB, and hobby CNC applications.

  • Immediate Upgrade: Extend the utility of your existing collet chuck to a new motor platform without sourcing custom parts.

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.

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