{"product_id":"brass-flexible-shaft-coupling-rigid-coupler-motor-connector-cnc","title":"Brass Flexible Shaft Coupling Rigid Coupler Motor Connector CNC 2\/3\/3.17\/4\/5\/6mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eBrass Flexible Shaft Coupling — Precision Rigid Coupler for CNC \u0026amp; Motor Drives\u003c\/h2\u003e\n\u003cp\u003eWhen a misaligned or slipping shaft coupling causes your CNC axis to lose steps or your motor drive to vibrate under load, the root cause is almost always a coupler that can't hold tolerance. Machinists, robotics builders, and DIY automation enthusiasts who need a repeatable, zero-backlash connection between two shafts will find this brass rigid coupler a dependable solution.\u003c\/p\u003e\n\u003cp\u003eEach coupler is machined from brass, offering a balance of machinability, corrosion resistance, and moderate weight. The body accommodates two bore diameters simultaneously — input and output bores ranging from 2 mm (approx. 0.079 in) up to 6 mm (approx. 0.236 in) — making it suitable for mixed-shaft assemblies where the motor shaft and lead screw differ in diameter. Overall coupler length is typically 25–35 mm depending on bore combination; outer diameter is typically 12–20 mm. Exact dimensions vary by variant — see variant options for your specific combination.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include NEMA 17\/23 stepper motor to lead screw connections on 3D printers and CNC routers, encoder shaft extensions on servo drives, and small DC gear-motor output shaft connections in robotics and automation rigs where a rigid, non-flexible coupling is preferred for positional accuracy.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits stepper motors, servo motors, DC gear motors, and lead screws with shaft diameters of 2 mm, 2.3 mm, 3 mm, 3.17 mm (1\/8 in), 4 mm, 5 mm, or 6 mm. Select matching input and output bore from the variant options above.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These Brass Flexible Shaft Couplings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n\u003cstrong\u003eDual-Bore Design\u003c\/strong\u003e\n\u003cp\u003eAccepts two different shaft diameters simultaneously — ideal for connecting a motor shaft to a lead screw or encoder of a different size without adapters.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\n\u003cstrong\u003eRigid Coupler Construction\u003c\/strong\u003e\n\u003cp\u003eSolid one-piece body transmits torque directly with minimal angular or radial play, supporting positional accuracy in CNC and motion-control applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🟡\u003c\/span\u003e\n\u003cstrong\u003eBrass Material\u003c\/strong\u003e\n\u003cp\u003eBrass construction provides good machinability for field modification, natural corrosion resistance in typical workshop environments, and a lower magnetic signature than steel couplers.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eWide Bore Range\u003c\/strong\u003e\n\u003cp\u003eAvailable in bore combinations spanning 2 mm to 6 mm (approx. 0.079–0.236 in), covering the most common shaft sizes used in hobby CNC, 3D printing, and small automation builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n\u003cstrong\u003eSet-Screw Retention\u003c\/strong\u003e\n\u003cp\u003eSecured to each shaft via set screws (typically M3 or M4 depending on bore size), allowing tool-free removal and repositioning during prototyping or maintenance.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n\u003cstrong\u003eFlexible Quantity Options\u003c\/strong\u003e\n\u003cp\u003eAvailable in packs of 1, 3, 5, 10, 20, or 30 pieces — order a single coupler for a repair or stock up for a multi-axis build or production run.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — Brass Shaft Coupling\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter (Input)\u003c\/th\u003e\n\u003ctd\u003eSee variant options (2 mm \/ 2.3 mm \/ 3 mm \/ 3.17 mm \/ 4 mm \/ 5 mm \/ 6 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter (Output)\u003c\/th\u003e\n\u003ctd\u003eSee variant options (2 mm \/ 3 mm \/ 3.17 mm \/ 4 mm \/ 5 mm \/ 6 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eTypically 12–20 mm (varies by bore combination)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupler Length\u003c\/th\u003e\n\u003ctd\u003eTypically 25–35 mm (varies by bore combination)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRetention Method\u003c\/th\u003e\n\u003ctd\u003eSet screw (M3 or M4, varies by bore size)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupler Type\u003c\/th\u003e\n\u003ctd\u003eRigid (non-flexible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003eSee variant options (1 \/ 3 \/ 5 \/ 10 \/ 20 \/ 30 pcs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Shaft Types\u003c\/th\u003e\n\u003ctd\u003eRound shafts with flat (D-cut) or round cross-section\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right bore diameter combination?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect the bore that matches your motor shaft diameter as the input bore, and the bore that matches your lead screw or driven shaft as the output bore. For example, if your NEMA 17 stepper has a 5 mm shaft and your lead screw is 8 mm — that combination is not listed, so you would need an intermediate adapter. All available combinations are listed in the variant selector above.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs this a flexible or rigid coupling?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis is a rigid coupler. It does not absorb angular or parallel misalignment between shafts. For best results, ensure your motor and driven shaft are well-aligned before installation. If your application requires misalignment compensation, consider a jaw-type or bellows flexible coupling instead.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill brass corrode in a humid or outdoor environment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass has good natural corrosion resistance in typical indoor workshop and light industrial environments. In high-humidity or salt-air outdoor conditions, surface oxidation (patina) may develop over time but generally does not affect structural integrity. For harsh outdoor or marine environments, a stainless steel coupler would be a more suitable choice.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat set screw size is used to secure the shafts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSet screw size varies by bore diameter. Smaller bores (2–3 mm) typically use M3 set screws, while larger bores (4–6 mm) typically use M4 set screws. A standard hex key (Allen key) is used for tightening. We recommend applying a small amount of thread-locking compound for vibration-prone applications.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this coupler on a 3D printer or CNC router?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These couplers are commonly used to connect NEMA 17 stepper motor shafts (typically 5 mm) to T8 or T12 lead screws (typically 8 mm — note: 8 mm bore is not in this listing) or to other lead screw diameters available in the variant list. Check your motor shaft and lead screw diameters before ordering to confirm the correct bore combination.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow many pieces should I order for a multi-axis CNC build?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA standard 3-axis CNC router or 3D printer typically requires 3 couplers (one per axis). A 4-axis machine needs 4. Ordering a 5-pack or 10-pack provides spares for future maintenance or prototyping. The per-unit cost decreases with larger pack quantities, so stocking up is cost-effective for multi-machine builds.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the maximum RPM or torque rating for this coupler?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSpecific RPM and torque ratings depend on the bore combination and application conditions. As a general guide, brass rigid couplers in this size range are suitable for low-to-medium speed applications (typically up to 3,000–5,000 RPM) and light-to-moderate torque loads consistent with hobby CNC and small automation use. Contact us to confirm suitability for high-speed or high-torque applications.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Bore Diameter and Qty above, then add to cart.\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right bore diameter combination?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Select the bore that matches your motor shaft diameter as the input bore, and the bore that matches your lead screw or driven shaft as the output bore. All available combinations are listed in the variant selector above.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this a flexible or rigid coupling?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This is a rigid coupler. It does not absorb angular or parallel misalignment between shafts. Ensure your motor and driven shaft are well-aligned before installation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will brass corrode in a humid or outdoor environment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass has good natural corrosion resistance in typical indoor workshop environments. In high-humidity or outdoor conditions, surface oxidation may develop but generally does not affect structural integrity.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What set screw size is used to secure the shafts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Set screw size varies by bore diameter. Smaller bores (2–3 mm) typically use M3 set screws, while larger bores (4–6 mm) typically use M4 set screws.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this coupler on a 3D printer or CNC router?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These couplers are commonly used to connect NEMA 17 stepper motor shafts to lead screws. Check your motor shaft and lead screw diameters before ordering to confirm the correct bore combination.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pieces should I order for a multi-axis CNC build?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A standard 3-axis CNC router or 3D printer typically requires 3 couplers (one per axis). Ordering a 5-pack or 10-pack provides spares for future maintenance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the maximum RPM or torque rating for this coupler?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass rigid couplers in this size range are suitable for low-to-medium speed applications (typically up to 3,000–5,000 RPM) and light-to-moderate torque loads consistent with hobby CNC and small automation use.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2mm to 2mm \/ 1 pcs","offer_id":52421795152146,"sku":"XFYXKJGK0126x1","price":2.52,"currency_code":"USD","in_stock":true},{"title":"2mm to 3mm \/ 1 pcs","offer_id":52421795184914,"sku":"XFYXKJGK0127x1","price":2.52,"currency_code":"USD","in_stock":true},{"title":"2mm to 4mm \/ 1 pcs","offer_id":52421795217682,"sku":"XFYXKJGK0128x1","price":2.52,"currency_code":"USD","in_stock":true},{"title":"2mm to 5mm \/ 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