{"product_id":"flexible-shaft-coupling-5-10mm-rigid-stepper-motor-coupler-d20-l25","title":"Inner Orifice 5-10mm Flexible Shaft Coupling Rigid Stepper Motor Coupler D20*L25","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eFlexible Shaft Coupling for Stepper Motors — Precise Torque Transfer, Zero Backlash\u003c\/h2\u003e\n\u003cp\u003eWhen misaligned shafts cause vibration, lost steps, or premature bearing wear, the root cause is often a poorly fitted coupling. Engineers, CNC builders, and 3D printer enthusiasts who demand repeatable positioning accuracy need a coupling that holds tight under continuous load without introducing play. This rigid flexible shaft coupling is engineered for exactly that — delivering firm, backlash-free torque transmission between motor and lead screw.\u003c\/p\u003e\n\u003cp\u003eEach coupler is machined from aluminum alloy with an outer diameter of 20mm (0.79 in) and a body length of 25mm (0.98 in). The inner orifice (bore) is available in a range of sizes from 5mm to 10mm (0.20–0.39 in), covering both metric and imperial shaft diameters including 6.35mm (1\/4 in) for compatibility with standard stepper motor shafts. Set screws on both ends lock each shaft independently for a secure, tool-adjustable grip.\u003c\/p\u003e\n\u003cp\u003eTypical applications include NEMA 17 and NEMA 23 stepper motor assemblies in CNC routers, lead screw drives in 3D printers, and light-duty robotic joint actuators where rigid coupling between motor shaft and driven shaft is required. The D20×L25 form factor fits within compact motor mounts without requiring additional clearance.\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 NEMA 17 \/ NEMA 23 stepper motors and standard lead screws with shaft diameters from 5mm to 10mm (including 6.35mm \/ 1\/4\"). Verify both motor shaft and lead screw diameters before selecting your variant.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Flexible Shaft Couplings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\n\u003cstrong\u003eRigid Zero-Backlash Design\u003c\/strong\u003e\n\u003cp\u003eSolid one-piece body with dual set-screw clamping eliminates rotational play, ensuring accurate positioning in CNC and 3D printing applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eWide Bore Range: 5–10mm\u003c\/strong\u003e\n\u003cp\u003eAvailable in 15 inner orifice combinations from 5×5mm to 10×10mm, including 6.35mm (1\/4\") for imperial stepper motor shafts — one listing covers most common setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n\u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e\n\u003cp\u003eLightweight yet rigid aluminum alloy body resists deformation under torque load while keeping rotational inertia low for responsive motor control.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n\u003cstrong\u003eD20×L25mm Compact Form Factor\u003c\/strong\u003e\n\u003cp\u003e20mm outer diameter and 25mm length fit standard motor mount cutouts without modification, making drop-in replacement straightforward.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔐\u003c\/span\u003e\n\u003cstrong\u003eIndependent Dual Set-Screw Locking\u003c\/strong\u003e\n\u003cp\u003eSeparate set screws on each bore end allow independent tightening of motor shaft and lead screw, accommodating slight diameter differences between the two sides.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n\u003cstrong\u003eBroad Stepper Motor Compatibility\u003c\/strong\u003e\n\u003cp\u003eDesigned to pair with NEMA 17 and NEMA 23 stepper motors commonly used in CNC routers, laser engravers, 3D printers, and light robotics platforms.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Flexible Shaft Coupling\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (D)\u003c\/th\u003e\n\u003ctd\u003e20mm (0.79 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBody Length (L)\u003c\/th\u003e\n\u003ctd\u003e25mm (0.98 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Orifice (Bore)\u003c\/th\u003e\n\u003ctd\u003e5×5mm to 10×10mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAluminum alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupling Type\u003c\/th\u003e\n\u003ctd\u003eRigid \/ Zero-backlash\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLocking Method\u003c\/th\u003e\n\u003ctd\u003eDual set screws (one per bore end)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Motor Types\u003c\/th\u003e\n\u003ctd\u003eNEMA 17, NEMA 23 stepper motors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Diameter Range\u003c\/th\u003e\n\u003ctd\u003e5mm – 10mm (incl. 6.35mm \/ 1\/4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right inner orifice size?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure both your stepper motor shaft diameter and your lead screw diameter. Select the variant where the first number matches your motor shaft and the second number matches your lead screw. For example, if your motor shaft is 5mm and your lead screw is 8mm, choose the 5×8mm variant. If you are unsure, use a digital caliper for an accurate measurement.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this coupling suitable for high-speed applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis rigid coupler is optimized for low-to-medium speed stepper motor applications such as CNC routers, 3D printers, and lead screw drives. It is not designed for high-RPM spindle or servo motor applications where flexible or jaw-type couplings are typically preferred.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this coupler handle shaft misalignment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eAs a rigid coupling, it does not compensate for angular or parallel misalignment. Both shafts should be as co-axial as possible before installation. If your application involves inherent misalignment, consider a flexible jaw or helical coupler instead.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the aluminum alloy body corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eAluminum alloy offers good natural oxidation resistance for indoor and dry environments. For applications exposed to moisture, coolant mist (e.g., CNC with flood cooling), or corrosive atmospheres, additional protective measures or a stainless steel alternative may be advisable.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this with a NEMA 17 stepper motor?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. NEMA 17 stepper motors typically have a 5mm output shaft. Select any variant with a first bore dimension of 5mm (e.g., 5×5mm, 5×6mm, 5×8mm, or 5×10mm) depending on your lead screw diameter. The D20×L25 body fits standard NEMA 17 motor mounts without modification.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does the 6.35mm bore option accommodate?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e6.35mm is the metric equivalent of 1\/4 inch, a common shaft diameter on imperial-spec stepper motors and some lead screws used in North American CNC kits. The 6.35mm variants allow direct compatibility without adapters or machining.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow are the set screws tightened, and what tool is needed?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe set screws are typically M3 or M4 hex socket head screws tightened with an Allen (hex) key. Insert each shaft fully into its respective bore, then tighten the corresponding set screw firmly. Avoid over-tightening, which can deform soft shaft surfaces. Contact us to confirm the exact set screw size for your variant.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Inner Orifice size 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 inner orifice size?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure both your stepper motor shaft diameter and your lead screw diameter. Select the variant where the first number matches your motor shaft and the second number matches your lead screw. For example, if your motor shaft is 5mm and your lead screw is 8mm, choose the 5x8mm variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this coupling suitable for high-speed applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This rigid coupler is optimized for low-to-medium speed stepper motor applications such as CNC routers, 3D printers, and lead screw drives. It is not designed for high-RPM spindle or servo motor applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this coupler handle shaft misalignment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"As a rigid coupling, it does not compensate for angular or parallel misalignment. Both shafts should be as co-axial as possible before installation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is the aluminum alloy body corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Aluminum alloy offers good natural oxidation resistance for indoor and dry environments. For applications exposed to moisture or corrosive atmospheres, additional protective measures may be advisable.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this with a NEMA 17 stepper motor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. NEMA 17 stepper motors typically have a 5mm output shaft. Select any variant with a first bore dimension of 5mm depending on your lead screw diameter.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does the 6.35mm bore option accommodate?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"6.35mm is the metric equivalent of 1\/4 inch, a common shaft diameter on imperial-spec stepper motors and some lead screws used in North American CNC kits.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How are the set screws tightened, and what tool is needed?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The set screws are typically M3 or M4 hex socket head screws tightened with an Allen key. Insert each shaft fully into its respective bore, then tighten the corresponding set screw firmly.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"5 x 5mm","offer_id":52422006833426,"sku":"LXDBJT02151x1","price":11.53,"currency_code":"USD","in_stock":true},{"title":"5 x 6mm","offer_id":52422006866194,"sku":"LXDBJT02161x1","price":11.53,"currency_code":"USD","in_stock":true},{"title":"5 x 8mm","offer_id":52422006898962,"sku":"LXDBJT02160x1","price":11.53,"currency_code":"USD","in_stock":true},{"title":"5 x 10mm","offer_id":52422006931730,"sku":"LXDBJT02153x1","price":11.53,"currency_code":"USD","in_stock":true},{"title":"6 x 6mm","offer_id":52422006964498,"sku":"LXDBJT02152x1","price":11.53,"currency_code":"USD","in_stock":true},{"title":"6 x 8mm","offer_id":52422006997266,"sku":"LXDBJT02150x1","price":11.53,"currency_code":"USD","in_stock":true},{"title":"6 x 10mm","offer_id":52422007030034,"sku":"LXDBJT02155x1","price":11.53,"currency_code":"USD","in_stock":true},{"title":"6.35 x 5mm","offer_id":52422007062802,"sku":"LXDBJT02159x1","price":11.53,"currency_code":"USD","in_stock":true},{"title":"6.35 x 6mm","offer_id":52422007095570,"sku":"LXDBJT02158x1","price":11.53,"currency_code":"USD","in_stock":true},{"title":"6.35 x 6.35mm","offer_id":52422007128338,"sku":"LXDBJT02148x1","price":11.53,"currency_code":"USD","in_stock":true},{"title":"6.35 x 8mm","offer_id":52422007161106,"sku":"LXDBJT02147x1","price":11.53,"currency_code":"USD","in_stock":true},{"title":"6.35 x 10mm","offer_id":52422007193874,"sku":"LXDBJT02149x1","price":11.53,"currency_code":"USD","in_stock":true},{"title":"8 x 8mm","offer_id":52422007226642,"sku":"LXDBJT02154x1","price":11.53,"currency_code":"USD","in_stock":true},{"title":"8 x 10mm","offer_id":52422007259410,"sku":"LXDBJT02157x1","price":11.53,"currency_code":"USD","in_stock":true},{"title":"10 x 10mm","offer_id":52422007292178,"sku":"LXDBJT02156x1","price":11.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-06_622255e5-183d-4202-a34e-b181cf40eaab.jpg?v=1783364427","url":"https:\/\/homediyer.com\/products\/flexible-shaft-coupling-5-10mm-rigid-stepper-motor-coupler-d20-l25","provider":"HomeDIYer","version":"1.0","type":"link"}