{"product_id":"rigid-shaft-flexible-coupling-cnc-motor-shaft-coupler","title":"Rigid Shaft Flexible Coupling For CNC Motor Shaft Joint Coupler Connector 4-40mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eRigid Shaft Flexible Coupling for CNC Motor Shaft — Precise Torque Transfer, Zero Backlash\u003c\/h2\u003e\n    \u003cp\u003eWhen misalignment, vibration, or shaft slippage disrupts your CNC build or motor-driven project, the root cause is often a poorly fitted coupler. Engineers, makers, and machine builders who demand repeatable accuracy need a shaft coupler that locks firmly, transmits torque without flex loss, and fits a wide range of bore diameters without custom machining.\u003c\/p\u003e\n    \u003cp\u003eThis rigid shaft flexible coupling is machined from aluminum alloy with a hard-anodized surface, available in single-joint and double-joint configurations. Coupler outer diameters range from D20mm to D94mm (approx. 0.79\"–3.70\"), with bore diameter compatibility spanning 4mm to 50mm (approx. 0.16\"–1.97\"). The helical-cut body provides a degree of angular compensation while maintaining rigid axial torque transmission.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include CNC router Z-axis motor coupling, 3D printer lead screw to stepper motor connection, benchtop lathe spindle shaft joining, and servo motor shaft coupler replacement in automation rigs — all scenarios where a reliable motor shaft joint coupler connector is critical to machine performance.\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    Compatible with NEMA 17, NEMA 23, and NEMA 34 stepper motors, servo motors, and most CNC, 3D printer, and lathe lead screw shafts within the listed bore diameter range.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Rigid Shaft Flexible Couplings\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-list\"\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003eSingle \u0026amp; Double Joint Options\u003c\/strong\u003e\n        \u003cp\u003eChoose single-body for compact motor bays or double-joint for extended shaft spans and greater angular compensation between two shafts.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eWide Bore Range: 4mm–50mm\u003c\/strong\u003e\n        \u003cp\u003eCovers the most common stepper and servo motor shaft diameters, eliminating the need for custom adapters across NEMA 17 to NEMA 34 builds.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n        \u003cstrong\u003eAluminum Alloy with Hard-Anodized Finish\u003c\/strong\u003e\n        \u003cp\u003eLightweight yet rigid construction resists corrosion and wear, maintaining dimensional stability under continuous rotational load.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eHelical-Cut Flexible Body\u003c\/strong\u003e\n        \u003cp\u003eThe spiral cut allows minor angular and parallel misalignment compensation without sacrificing axial rigidity or introducing backlash into the drivetrain.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n        \u003cstrong\u003eSet Screw Clamping Mechanism\u003c\/strong\u003e\n        \u003cp\u003eDual set screws per bore end provide secure shaft locking, preventing rotational slip under high-torque or reversing-direction motor loads.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n        \u003cstrong\u003e10 Coupler Sizes per Configuration\u003c\/strong\u003e\n        \u003cp\u003eFrom D20×L20mm up to D94×L68mm (single) and D94×L98mm (double), with matching bore options — one listing covers your entire machine build.\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 — Rigid Shaft Flexible Coupling\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAluminum alloy (hard-anodized)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eConfiguration\u003c\/th\u003e\n\u003ctd\u003eSingle joint \/ Double joint (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (D)\u003c\/th\u003e\n\u003ctd\u003e20mm – 94mm (0.79\" – 3.70\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBody Length (L)\u003c\/th\u003e\n\u003ctd\u003e20mm – 98mm (0.79\" – 3.86\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e4mm – 50mm (0.16\" – 1.97\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eClamping Method\u003c\/th\u003e\n\u003ctd\u003eSet screw (dual per bore end)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eHard anodized (corrosion resistant)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 pc\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\u003eCompatible Motor Types\u003c\/th\u003e\n\u003ctd\u003eStepper motors, servo motors, DC motors\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eCNC routers, 3D printers, lathes, automation rigs\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 between Single and Double joint couplings?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSingle-joint couplings are more compact and suited for tight motor bays where shaft ends are close together. Double-joint couplings are longer, providing greater angular misalignment compensation and are ideal when the motor and driven shaft are spaced further apart or when additional flexibility is needed in the drivetrain.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich bore diameter should I select for my stepper motor?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the bore diameter to your motor shaft diameter. Common NEMA 17 shafts are 5mm; NEMA 23 shafts are typically 6.35mm or 8mm; NEMA 34 shafts are commonly 12.7mm or 14mm. Select the bore range option that includes your shaft size — for example, \"5mm to 12mm\" covers NEMA 17 and smaller NEMA 23 shafts.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan this coupling handle misalignment between two shafts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The helical-cut flexible body allows for minor angular misalignment (typically up to 1°–3°) and small amounts of parallel offset. However, this is a rigid-type flexible coupling — it is not designed for large misalignment. For best results, align shafts as closely as possible before installation.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this coupling corrosion resistant for use in humid or outdoor environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe hard-anodized aluminum alloy surface provides good resistance to oxidation and mild corrosion. It is suitable for indoor workshop environments and light-duty outdoor use. For highly corrosive or wet environments, additional protective measures are recommended.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill the set screws hold under reversing motor loads or high torque?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eDual set screws per bore end provide a secure mechanical lock on the shaft. For high-torque or frequent direction-reversing applications, ensure set screws are tightened to the appropriate torque spec and consider using a thread-locking compound for added security.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between the coupler dimension options (e.g., D20mm x L20mm vs D26mm x L26mm)?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe D value is the outer diameter of the coupler body and the L value is the total body length. Larger D and L dimensions generally support larger bore diameters and higher torque capacity. Select the smallest coupler size that accommodates your shaft diameters to keep the assembly compact and minimize rotational inertia.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this suitable for 3D printer lead screw to stepper motor connections?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. This is one of the most common use cases. The D20mm x L20mm (single) or D20mm x L28mm (double) options with 4mm–8mm bore are well-suited for connecting a 5mm stepper shaft to a standard T8 or T12 lead screw on most FDM 3D printers.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    €Shopping; Select your coupler dimension and bore diameter 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 between Single and Double joint couplings?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Single-joint couplings are more compact and suited for tight motor bays where shaft ends are close together. Double-joint couplings are longer, providing greater angular misalignment compensation and are ideal when the motor and driven shaft are spaced further apart.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which bore diameter should I select for my stepper motor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the bore diameter to your motor shaft diameter. Common NEMA 17 shafts are 5mm; NEMA 23 shafts are typically 6.35mm or 8mm; NEMA 34 shafts are commonly 12.7mm or 14mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can this coupling handle misalignment between two shafts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The helical-cut flexible body allows for minor angular misalignment (typically up to 1-3 degrees) and small amounts of parallel offset. For best results, align shafts as closely as possible before installation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this coupling corrosion resistant for use in humid or outdoor environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The hard-anodized aluminum alloy surface provides good resistance to oxidation and mild corrosion. It is suitable for indoor workshop environments and light-duty outdoor use.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will the set screws hold under reversing motor loads or high torque?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Dual set screws per bore end provide a secure mechanical lock on the shaft. Consider using a thread-locking compound for added security in high-torque applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the coupler dimension options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The D value is the outer diameter and L is the total body length. Larger dimensions support larger bore diameters and higher torque. Select the smallest size that fits your shaft diameters.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this suitable for 3D printer lead screw to stepper motor connections?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The D20mm x L20mm (single) or D20mm x L28mm (double) with 4mm-8mm bore are well-suited for connecting a 5mm stepper shaft to a standard T8 or T12 lead screw on most FDM 3D printers.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"Single \/ D20mm x L20mm \/ 4mm to 8mm \u0026 1 pcs","offer_id":52421799903506,"sku":"XFYXKJGK0150x1","price":15.75,"currency_code":"USD","in_stock":true},{"title":"Single \/ D26mm x L26mm \/ 5mm to 12mm \u0026 1 pcs","offer_id":52421799936274,"sku":"XFYXKJGK0151x1","price":16.46,"currency_code":"USD","in_stock":true},{"title":"Single \/ D34mm x L31mm \/ 6mm to 16mm \u0026 1 pcs","offer_id":52421799969042,"sku":"XFYXKJGK0152x1","price":21.35,"currency_code":"USD","in_stock":true},{"title":"Single \/ D40mm x L35mm \/ 8mm to 19mm \u0026 1 pcs","offer_id":52421800001810,"sku":"XFYXKJGK0153x1","price":27.06,"currency_code":"USD","in_stock":true},{"title":"Single \/ D45mm x L35mm \/ 10mm to 22mm \u0026 1 pcs","offer_id":52421800034578,"sku":"XFYXKJGK0154x1","price":33.16,"currency_code":"USD","in_stock":true},{"title":"Single \/ D50mm x L40mm \/ 12mm to 25mm \u0026 1 pcs","offer_id":52421800067346,"sku":"XFYXKJGK0155x1","price":46.65,"currency_code":"USD","in_stock":true},{"title":"Single \/ D56mm x L45mm \/ 12mm to 28mm \u0026 1 pcs","offer_id":52421800100114,"sku":"XFYXKJGK0156x1","price":51.11,"currency_code":"USD","in_stock":true},{"title":"Single \/ D68mm x L53mm \/ 16mm to 35mm \u0026 1 pcs","offer_id":52421800132882,"sku":"XFYXKJGK0157x1","price":80.48,"currency_code":"USD","in_stock":true},{"title":"Single \/ D82mm x L68mm \/ 16mm to 40mm \u0026 1 pcs","offer_id":52421800165650,"sku":"XFYXKJGK0158x1","price":130.42,"currency_code":"USD","in_stock":true},{"title":"Single \/ D94mm x L68mm \/ 25mm to 50mm \u0026 1 pcs","offer_id":52421800198418,"sku":"XFYXKJGK0159x1","price":229.27,"currency_code":"USD","in_stock":true},{"title":"Double \/ D20mm x L28mm \/ 4mm to 8mm \u0026 1 pcs","offer_id":52421800231186,"sku":"XFYXKJGK0160x1","price":17.82,"currency_code":"USD","in_stock":true},{"title":"Double \/ D26mm x L35mm \/ 5mm to 12mm \u0026 1 pcs","offer_id":52421800263954,"sku":"XFYXKJGK0161x1","price":20.81,"currency_code":"USD","in_stock":true},{"title":"Double \/ D34mm x L45mm \/ 6mm to 16mm \u0026 1 pcs","offer_id":52421800296722,"sku":"XFYXKJGK0162x1","price":27.34,"currency_code":"USD","in_stock":true},{"title":"Double \/ D40mm x L50mm \/ 8mm to 19mm \u0026 1 pcs","offer_id":52421800329490,"sku":"XFYXKJGK0163x1","price":33.86,"currency_code":"USD","in_stock":true},{"title":"Double \/ D45mm x L50mm \/ 10mm to 22mm \u0026 1 pcs","offer_id":52421800362258,"sku":"XFYXKJGK0164x1","price":43.49,"currency_code":"USD","in_stock":true},{"title":"Double \/ D50mm x L60mm \/ 12mm to 24mm \u0026 1 pcs","offer_id":52421800395026,"sku":"XFYXKJGK0165x1","price":66.07,"currency_code":"USD","in_stock":true},{"title":"Double \/ D56mm x L64mm \/ 12mm to 28mm \u0026 1 pcs","offer_id":52421800427794,"sku":"XFYXKJGK0166x1","price":69.6,"currency_code":"USD","in_stock":true},{"title":"Double \/ D68mm x L74mm \/ 16mm to 35mm \u0026 1 pcs","offer_id":52421800460562,"sku":"XFYXKJGK0167x1","price":107.14,"currency_code":"USD","in_stock":true},{"title":"Double \/ D82mm x L98mm \/ 18mm to 40mm \u0026 1 pcs","offer_id":52421800493330,"sku":"XFYXKJGK0168x1","price":183.84,"currency_code":"USD","in_stock":true},{"title":"Double \/ D94mm x L98mm \/ 25mm to 40mm \u0026 1 pcs","offer_id":52421800526098,"sku":"XFYXKJGK0169x1","price":296.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-05_4447d3ac-6b32-478c-b3cd-33d918e98df2.jpg?v=1783325736","url":"https:\/\/homediyer.com\/products\/rigid-shaft-flexible-coupling-cnc-motor-shaft-coupler","provider":"HomeDIYer","version":"1.0","type":"link"}