{"product_id":"2-35mm-mini-brass-drill-chuck-shaft-adapter-small-dc-motors-rotary-tools","title":"Mini Brass Drill Chuck Shaft Adapter – 2.35mm for Small DC Motors \u0026 Rotary Tools","description":"\u003cstyle\u003e\na {\n  text-decoration: none;\n  color: inherit;\n  transition: all 0.3s ease;\n}\na:hover {\n  text-decoration: underline;\n}\n@media only screen and (max-width: 768px) {\n  body { font-size: 16px; line-height: 1.6; padding: 0 10px; }\n  a { word-break: break-word; font-size: 16px; }\n  img { max-width: 100%; height: auto; }\n  table { width: 100%; display: block; overflow-x: auto; }\n}\n\u003c\/style\u003e\n\u003cp\u003eThe \u003cstrong\u003eMini Brass Drill Chuck Shaft Adapter\u003c\/strong\u003e 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 — \u003cstrong\u003e2.35 mm, 3.17 mm, 4.05 mm, and 5.05 mm\u003c\/strong\u003e — 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 \u003cstrong\u003e\u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/jewelry-making-tools\" rel=\"noreferrer\" target=\"_blank\"\u003ejewelry making\u003c\/a\u003e\u003c\/strong\u003e, \u003cstrong\u003e\u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/lapidary-grinding-polishing\" rel=\"noreferrer\" target=\"_blank\"\u003elapidary work\u003c\/a\u003e\u003c\/strong\u003e, \u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/glass-grinding-finishing\" rel=\"noreferrer\" target=\"_blank\"\u003eglass finishing\u003c\/a\u003e, and \u003cstrong\u003eDIY precision fabrication\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003ch4\u003e\u003cstrong\u003ePrecision-Machined Brass Construction\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003eSolid Brass Body\u003c\/strong\u003e: Machined to tight tolerances for a secure, wobble-free fit between your motor shaft and collet chuck — minimizing runout and vibration at operating RPM.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003eKnurled Grip Surface\u003c\/strong\u003e: Textured exterior for positive hand-tightening and secure seating during chuck installation and removal.\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003e\u003cstrong\u003eFour Standard Shaft Sizes\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003e2.35 mm\u003c\/strong\u003e: Fits micro drill press spindles and compact hobby motors common in PCB and electronics fabrication setups.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003e3.17 mm (1\/8\")\u003c\/strong\u003e: The universal standard for Dremel, WEN, Foredom, and equivalent rotary tools — the most widely used shaft size in lapidary and jewelry bench work.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003e4.05 mm\u003c\/strong\u003e: Compatible with mid-range DC hobby motors including select 550 and 775 series motors used in DIY CNC and engraving machines.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003e5.05 mm\u003c\/strong\u003e: Fits larger CNC spindle motors and high-torque hobby motors used in router and engraving applications.\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003e\u003cstrong\u003eUniversal Chuck Compatibility\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003eDesigned to pair directly with our \u003cstrong\u003eMini Brass Collet Chuck\u003c\/strong\u003e (3.17 mm bore) — sold separately or as part of the \u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/machine-accessories\" rel=\"noreferrer\" target=\"_blank\"\u003eFull Collet Chuck Set\u003c\/a\u003e.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003eAlso compatible with most third-party mini brass chucks accepting a standard 3.17 mm (1\/8\") input bore.\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eApplications\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003ch4\u003e\u003cstrong\u003eLapidary \u0026amp; Glass Finishing\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003eMotor Shaft Upgrades\u003c\/strong\u003e: Swap shaft adapters to repurpose existing motors for new chuck configurations — ideal for \u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/lapidary-grinding-polishing\" rel=\"noreferrer\" target=\"_blank\"\u003elapidary grinding\u003c\/a\u003e and \u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/glass-grinding-finishing\" rel=\"noreferrer\" target=\"_blank\"\u003eglass carving\u003c\/a\u003e setups.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003eFlex-Shaft Compatibility\u003c\/strong\u003e: The 3.17 mm adapter integrates directly with Foredom and equivalent flex-shaft handpieces for bench-top lapidary and stone carving work.\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003e\u003cstrong\u003eJewelry Making \u0026amp; Precision Bench Work\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003eRotary Tool Integration\u003c\/strong\u003e: Attach a collet chuck to Dremel-style tools via the 3.17 mm adapter for improved grip on fine burs, engraving bits, and \u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/sintered-diamond-core-drills\" rel=\"noreferrer\" target=\"_blank\"\u003esintered diamond points\u003c\/a\u003e.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003eMicro Drill Press Spindles\u003c\/strong\u003e: The 2.35 mm adapter fits compact benchtop drill press spindles used in \u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/jewelry-making-tools\" rel=\"noreferrer\" target=\"_blank\"\u003ejewelry fabrication\u003c\/a\u003e and stone setting work.\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003e\u003cstrong\u003eElectronics, PCB \u0026amp; DIY Fabrication\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003eHobby Motor Builds\u003c\/strong\u003e: Covers the majority of 385, 550, and 775 series DC motor shaft diameters — enabling collet chuck attachment without custom machining or press-fit adapters.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003eCNC \u0026amp; Engraving Spindles\u003c\/strong\u003e: The 4.05 mm and 5.05 mm adapters suit low-power CNC router spindles and desktop engraving machines requiring a secure chuck interface.\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Size\u003c\/th\u003e\n\u003cth\u003eCommon Motor \/ Tool Type\u003c\/th\u003e\n\u003cth\u003eTypical Application\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e2.35 mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMicro drill press spindles, compact hobby motors\u003c\/td\u003e\n\u003ctd\u003ePCB drilling, electronics fabrication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3.17 mm (1\/8\")\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDremel, WEN, Foredom, flex-shaft handpieces\u003c\/td\u003e\n\u003ctd\u003eLapidary, jewelry, glass finishing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e4.05 mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e550 \/ 775 series DC hobby motors\u003c\/td\u003e\n\u003ctd\u003eDIY CNC, engraving, hobby builds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e5.05 mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCNC spindle motors, high-torque hobby motors\u003c\/td\u003e\n\u003ctd\u003eRouter spindles, engraving machines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003e\u003cstrong\u003eComparison: Shaft Adapter vs. Full Chuck Set\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eShaft Adapter (This Listing)\u003c\/th\u003e\n\u003cth\u003eFull Collet Chuck Set\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eContents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 shaft adapter (choose size)\u003c\/td\u003e\n\u003ctd\u003eChuck body + 11 collets + 1 adapter + hex key\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBest For\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eReplacing or adding an adapter to an existing chuck\u003c\/td\u003e\n\u003ctd\u003eComplete micro-drilling solution from scratch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChuck Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes — sold separately\u003c\/td\u003e\n\u003ctd\u003eIncluded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShaft Sizes Available\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.35 mm, 3.17 mm, 4.05 mm, 5.05 mm\u003c\/td\u003e\n\u003ctd\u003eOne size included per kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003e\u003cstrong\u003eInstallation\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003eSelect the adapter matching your motor shaft diameter and press it firmly onto the motor shaft.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003eThread or press the collet chuck body onto the adapter’s output end (3.17 mm bore).\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003eInsert the appropriate collet, load your drill bit or bur shank, and tighten with the hex key before operating.\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBest Practices\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003eVerify your motor shaft diameter with calipers before ordering — nominal sizes (e.g. “3 mm”) may vary slightly by manufacturer.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003eEnsure the adapter is fully seated and secure before operating at high RPM to prevent runout or chuck wobble.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003eWhen drilling hard materials such as stone or glass, pair with \u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/diamond-wire-hollow-drill-bits\" rel=\"noreferrer\" target=\"_blank\"\u003ediamond-coated drill bits\u003c\/a\u003e and use water as a coolant to extend bit life.\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatible Collet Sizes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis adapter is compatible with the following collet sizes when used with our Mini Brass Collet Chuck:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eCollet Size\u003c\/th\u003e\n\u003cth\u003eClamping Range\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e0.5 mm\u003c\/td\u003e\n\u003ctd\u003e0.2 – 0.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e0.8 mm\u003c\/td\u003e\n\u003ctd\u003e0.3 – 0.9 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1.0 mm\u003c\/td\u003e\n\u003ctd\u003e0.7 – 1.1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1.2 mm\u003c\/td\u003e\n\u003ctd\u003e0.8 – 1.3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1.6 mm\u003c\/td\u003e\n\u003ctd\u003e1.3 – 1.7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1.8 mm\u003c\/td\u003e\n\u003ctd\u003e1.4 – 1.9 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2.0 mm\u003c\/td\u003e\n\u003ctd\u003e1.8 – 2.1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2.4 mm\u003c\/td\u003e\n\u003ctd\u003e2.1 – 2.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3.0 mm\u003c\/td\u003e\n\u003ctd\u003e2.5 – 3.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3.2 mm\u003c\/td\u003e\n\u003ctd\u003e2.8 – 3.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRelated Tools\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003e\u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/machine-accessories\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003cstrong\u003eMini Brass Collet Chuck Set\u003c\/strong\u003e\u003c\/a\u003e — The matching chuck body and collet set for use with this adapter.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/diamond-wire-hollow-drill-bits\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003cstrong\u003eDiamond Wire Hollow Drill Bits\u003c\/strong\u003e\u003c\/a\u003e — Ideal for drilling gemstones, glass, and ceramic with your chuck setup.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/sintered-diamond-core-drills\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003cstrong\u003eSintered Diamond Core Drills\u003c\/strong\u003e\u003c\/a\u003e — For larger bore drilling in hard stone and glass with superior longevity.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/machine-accessories\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003cstrong\u003eMachine Accessories\u003c\/strong\u003e\u003c\/a\u003e — Full range of shaft adapters, backing plates, and motor accessories.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/jewelry-making-tools\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003cstrong\u003eJewelry Making Tools\u003c\/strong\u003e\u003c\/a\u003e — Burs, mandrels, and precision tools for bench jewelers and stone setters.\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWhy Choose This Shaft Adapter?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003ePrecision Fit\u003c\/strong\u003e: Machined to tight tolerances for a secure, low-runout connection between your motor and collet chuck.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003eBroad Compatibility\u003c\/strong\u003e: Four sizes cover the most common DC motor and rotary tool shaft diameters used in lapidary, jewelry, PCB, and hobby CNC applications.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003eImmediate Upgrade\u003c\/strong\u003e: Extend the utility of your existing collet chuck to a new motor platform without sourcing custom parts.\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eIdeal For\u003c\/strong\u003e: \u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/jewelry-making-tools\" rel=\"noreferrer\" target=\"_blank\"\u003eJewelry makers\u003c\/a\u003e, \u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/lapidary-grinding-polishing\" rel=\"noreferrer\" target=\"_blank\"\u003elapidary artists\u003c\/a\u003e, PCB fabricators, model builders, and electronics makers upgrading or expanding their precision drilling setup.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eExplore our full range of \u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/machine-accessories\" rel=\"noreferrer\" target=\"_blank\"\u003emachine accessories\u003c\/a\u003e and \u003ca href=\"https:\/\/lapidarygrinder.com\/collections\/diamond-wire-hollow-drill-bits\" rel=\"noreferrer\" target=\"_blank\"\u003ediamond drill bits\u003c\/a\u003e to complete your precision drilling setup. For bulk orders or custom configurations, contact our team for tailored solutions.\u003c\/strong\u003e\u003c\/p\u003e","brand":"flexiblediamondabrasive","offers":[{"title":"Default Title","offer_id":53379637280952,"sku":null,"price":8.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0570\/3217\/9896\/files\/MiniBrassDrillChuckSet.webp?v=1776821115","url":"https:\/\/lapidarygrinder.com\/products\/2-35mm-mini-brass-drill-chuck-shaft-adapter-small-dc-motors-rotary-tools","provider":"hanslapidarytool","version":"1.0","type":"link"}