{"product_id":"d15-l20-flexible-shaft-coupling-rigid-cnc-motor-coupler-3d-printer-2-3-4-6-35mm","title":"D15*L20 Flexible Shaft Coupling Rigid CNC Motor Coupler 3D Printer 2\/3\/4~6.35mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eD15*L20 Flexible Shaft Coupling — Precision Motion Transfer for CNC \u0026amp; 3D Printing\u003c\/h2\u003e\n    \u003cp\u003eWhen a misaligned or slipping shaft coupling causes your CNC router to lose steps or your 3D printer to produce layer shifts, the root cause is almost always a poorly fitted coupler. Engineers, hobbyists, and workshop professionals who demand repeatable, backlash-free motion need a shaft coupling that grips firmly and transfers torque without play. The D15*L20 flexible shaft coupling rigid CNC motor coupler is engineered for exactly that application.\u003c\/p\u003e\n    \u003cp\u003eThis coupler features an aluminum alloy body with an outer diameter of 15 mm (0.59 in) and a length of 20 mm (0.79 in). The dual-bore design accepts two independent shaft diameters (d1 × d2), spanning from 2 mm up to 6.35 mm (approximately 1\/4 in), covering both metric and imperial shaft sizes. Each coupler is secured by set screws that clamp directly onto the shaft, providing a firm mechanical grip without adhesives.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include connecting stepper motor shafts to lead screws on CNC milling machines, coupling motor output shafts to encoder shafts in robotics projects, and linking drive shafts to ball screws on DIY 3D printer Z-axis assemblies. Long-tail applications such as \"2mm to 6.35mm shaft adapter for NEMA 17\" and \"rigid coupler for CNC lead screw\" are well served by this product's wide bore range.\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 stepper motors, CNC routers, 3D printer Z-axis lead screws, and encoder shafts with bore sizes 2 mm – 6.35 mm.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These D15*L20 Rigid Shaft Couplings\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🔩 Dual-Bore Versatility\u003c\/div\u003e\n    \u003cp\u003eEach coupler accepts two independently sized bores (d1 × d2), letting you connect shafts of different diameters — from 2 mm up to 6.35 mm — without adapters or sleeves.\u003c\/p\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e📐 Compact D15 × L20 Form Factor\u003c\/div\u003e\n    \u003cp\u003eAt just 15 mm outer diameter and 20 mm length, this coupler fits into tight motor-mount cavities common on desktop CNC machines and compact 3D printer frames.\u003c\/p\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🏗️ Aluminum Alloy Construction\u003c\/div\u003e\n    \u003cp\u003eThe aluminum alloy body delivers a strong strength-to-weight ratio, resists corrosion in workshop environments, and dissipates heat generated during continuous motor operation.\u003c\/p\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🔒 Set-Screw Clamping\u003c\/div\u003e\n    \u003cp\u003eRadial set screws lock the coupler firmly onto each shaft, preventing rotational slip under load and maintaining zero-backlash torque transmission during direction reversals.\u003c\/p\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e📏 Metric \u0026amp; Imperial Bore Range\u003c\/div\u003e\n    \u003cp\u003eBore options span standard metric sizes (2, 3, 4, 5, 6 mm) and common imperial sizes (3.17 mm ≈ 1\/8 in; 6.35 mm = 1\/4 in), covering the most widely used stepper motor and lead-screw shaft standards.\u003c\/p\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🔄 Rigid Torque Path\u003c\/div\u003e\n    \u003cp\u003eUnlike flexible jaw or spider couplings, this rigid design transmits torque with no angular deflection, making it ideal for applications where positional accuracy — such as CNC axis repeatability — is critical.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Rigid Shaft Coupling\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (D)\u003c\/th\u003e\n\u003ctd\u003e15 mm (0.59 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eLength (L)\u003c\/th\u003e\n\u003ctd\u003e20 mm (0.79 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore 1 (d1) Range\u003c\/th\u003e\n\u003ctd\u003e2 mm – 6.35 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore 2 (d2) Range\u003c\/th\u003e\n\u003ctd\u003e2 mm – 6.35 mm (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\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural anodized \/ mill finish\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eClamping Method\u003c\/th\u003e\n\u003ctd\u003eSet screw\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCoupling Type\u003c\/th\u003e\n\u003ctd\u003eRigid\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Size Combination\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 \/ 5 \/ 10 \/ 20 pcs (see 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\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the correct bore size combination?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure the outer diameter of each shaft you need to connect — your motor shaft (d1) and your lead screw or encoder shaft (d2). Select the variant that matches both diameters exactly. Common pairings include 5 mm × 8 mm for NEMA 17 to standard lead screws, or 6.35 mm × 6.35 mm for 1\/4-inch imperial shafts. If your shafts are the same size, choose a same-diameter variant such as 4 mm × 4 mm.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this a rigid or flexible coupling, and does that matter for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis is a rigid coupling, meaning it transmits torque without any angular or axial compliance. This is ideal for CNC axes and 3D printer lead screws where positional accuracy matters, because there is no spring-back or deflection. However, if your motor and driven shaft have significant angular misalignment, a flexible (jaw or bellows) coupler would be more appropriate to avoid bearing wear.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the torque capacity of this coupler?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe torque capacity depends on the set-screw clamping force and the aluminum alloy shear strength. For typical NEMA 17 stepper motors (holding torque up to approximately 0.4–0.6 N·m) and NEMA 23 motors (up to approximately 1–3 N·m), this D15 × L20 coupler is well within its operating range. For higher-torque applications, contact us to confirm suitability.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this coupler corrode in a humid or outdoor workshop environment?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe aluminum alloy body forms a natural oxide layer that provides good corrosion resistance in typical indoor workshop conditions, including moderate humidity. For prolonged outdoor exposure or contact with cutting fluids, applying a light coat of machine oil to the exterior surface is recommended to maintain appearance and prevent surface oxidation.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs 3.17 mm the same as 1\/8 inch, and will it fit my motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — 3.17 mm is the metric equivalent of 1\/8 inch (3.175 mm), which is a common shaft size on small DC motors, micro stepper motors, and some encoder shafts. The bore is machined to accept this size. Similarly, 6.35 mm equals exactly 1\/4 inch, covering many servo motor and gearbox output shafts.\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 Z-axis lead screw?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. This is one of the most common applications. Select the variant where d1 matches your stepper motor shaft (typically 5 mm for NEMA 17) and d2 matches your lead screw shaft (typically 5 mm or 8 mm). The rigid design ensures that motor steps translate directly into vertical movement without rotational play, which is critical for consistent layer height.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow many pieces do I receive, and is bulk pricing available?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYou can select 1, 5, 10, or 20 pieces per order using the Units (pcs) variant option. Bulk quantities are priced at a lower per-unit cost — the 20-piece option offers the best per-unit value. If you need quantities beyond 20 pieces, please contact us for a custom quote.\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 Hole (d1 × d2) size and Units (pcs) 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 correct bore size combination?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the outer diameter of each shaft you need to connect — your motor shaft (d1) and your lead screw or encoder shaft (d2). Select the variant that matches both diameters exactly. Common pairings include 5 mm × 8 mm for NEMA 17 to standard lead screws, or 6.35 mm × 6.35 mm for 1\/4-inch imperial shafts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this a rigid or flexible coupling, and does that matter for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This is a rigid coupling that transmits torque without angular or axial compliance. Ideal for CNC axes and 3D printer lead screws where positional accuracy matters. If your shafts have significant angular misalignment, a flexible coupler would be more appropriate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the torque capacity of this coupler?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For typical NEMA 17 stepper motors (up to approximately 0.4–0.6 N·m) and NEMA 23 motors (up to approximately 1–3 N·m), this D15 × L20 coupler is well within its operating range. For higher-torque applications, contact us to confirm suitability.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this coupler corrode in a humid or outdoor workshop environment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The aluminum alloy body forms a natural oxide layer that provides good corrosion resistance in typical indoor workshop conditions. For prolonged outdoor exposure or contact with cutting fluids, applying a light coat of machine oil is recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is 3.17 mm the same as 1\/8 inch?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — 3.17 mm is the metric equivalent of 1\/8 inch (3.175 mm), a common shaft size on small DC motors, micro stepper motors, and some encoder shafts. Similarly, 6.35 mm equals exactly 1\/4 inch.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this coupler on a 3D printer Z-axis lead screw?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Select the variant where d1 matches your stepper motor shaft (typically 5 mm for NEMA 17) and d2 matches your lead screw shaft (typically 5 mm or 8 mm). The rigid design ensures motor steps translate directly into vertical movement without rotational play.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pieces do I receive, and is bulk pricing available?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"You can select 1, 5, 10, or 20 pieces per order. Bulk quantities are priced at a lower per-unit cost. For quantities beyond 20 pieces, please contact us for a custom quote.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2mm * 2mm \/ 1","offer_id":52422007357714,"sku":"LXDLIIIIU0083x1","price":9.45,"currency_code":"USD","in_stock":true},{"title":"2mm * 3mm \/ 1","offer_id":52422007390482,"sku":"LXDLIIIIU0084x1","price":9.45,"currency_code":"USD","in_stock":true},{"title":"2mm * 3.17mm \/ 1","offer_id":52422007423250,"sku":"LXDLIIIIU0085x1","price":9.45,"currency_code":"USD","in_stock":true},{"title":"2mm * 4mm \/ 1","offer_id":52422007456018,"sku":"LXDLIIIIU0086x1","price":9.45,"currency_code":"USD","in_stock":true},{"title":"2mm * 5mm \/ 1","offer_id":52422007488786,"sku":"LXDLIIIIU0087x1","price":9.45,"currency_code":"USD","in_stock":true},{"title":"2mm * 6mm \/ 1","offer_id":52422007521554,"sku":"LXDLIIIIU0088x1","price":9.45,"currency_code":"USD","in_stock":true},{"title":"2mm * 6.35mm \/ 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