{"product_id":"color-aluminum-alloy-flexible-shaft-coupling-rigid-coupler-motor-connector-diy","title":"Color Aluminum Alloy Flexible Shaft Coupling Rigid Coupler Motor Connector DIY","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eAluminum Alloy Flexible Shaft Coupling — Precision Drive Connection for Motors \u0026amp; DIY Builds\u003c\/h2\u003e\n\u003cp\u003eWhen misalignment between motor shafts causes vibration, noise, or premature bearing wear, the right shaft coupling makes all the difference. Engineers, hobbyists, and CNC builders who need a reliable, low-backlash connection between two rotating shafts will find this color-coded aluminum alloy flexible shaft coupling an indispensable addition to their drive system toolkit.\u003c\/p\u003e\n\u003cp\u003eEach coupling is machined from aluminum alloy and features a two-piece clamp design with a helical cut that provides flexibility while transmitting torque. Bore diameters range from 2 mm (approx. 0.079 in) to 10 mm (approx. 0.394 in) across the full size range, with outer diameters typically 19–34 mm (approx. 0.75–1.34 in) depending on the selected variant. The color coding — dark red, dark blue, and light blue — corresponds to bore-size groupings, making it easy to identify the correct coupling at a glance.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include stepper motor to lead-screw connections on 3D printers and CNC routers, servo motor shaft coupling for robotic arms and automation rigs, and encoder-to-shaft coupling in precision measurement or feedback systems where low backlash and easy installation are critical.\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 standard round motor shafts. Select the correct bore sizes (D1 × D2) to match your motor shaft and driven shaft diameters. Both bores must match your actual shaft dimensions — see variant options for available combinations.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Aluminum Alloy Flexible Shaft Couplings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eHelical-Cut Flexible Design\u003c\/strong\u003e\u003cbr\u003eThe single-piece helical slot allows angular and parallel misalignment compensation while maintaining continuous torque transmission — reducing stress on motor bearings in real-world installations.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎨\u003c\/span\u003e\u003cstrong\u003eColor-Coded Size Identification\u003c\/strong\u003e\u003cbr\u003eDark red (2–3.17 mm bore range), dark blue (4–5 mm bore range), and light blue (6–8 mm bore range) color coding lets you instantly identify the correct coupling without measuring every time.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eDual Clamp Screw Retention\u003c\/strong\u003e\u003cbr\u003eEach half of the coupling is secured to its shaft via set screws, providing a firm grip that resists axial pull-out under dynamic loads typical of stepper and servo motor applications.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Bore Combination Range\u003c\/strong\u003e\u003cbr\u003eAvailable in same-bore and mixed-bore configurations (e.g., 2 mm × 3 mm, 5 mm × 8 mm) to accommodate shaft-to-shaft connections where the motor and driven shaft differ in diameter.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\u003cstrong\u003eLightweight Aluminum Alloy Construction\u003c\/strong\u003e\u003cbr\u003eThe aluminum alloy body keeps rotational inertia low — an advantage in applications requiring rapid acceleration and deceleration, such as CNC axis drives and pick-and-place systems.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Quantity Options\u003c\/strong\u003e\u003cbr\u003eAvailable in packs of 1, 2, 5, 10, or 20 pieces per order, making it practical to stock spares for prototyping labs, repair benches, or small-batch production builds.\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\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\u003eHelical-cut flexible \/ rigid clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter (D1)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter (D2)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOverall Length\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor \/ Size Group\u003c\/th\u003e\n\u003ctd\u003eDark red (2–3.17 mm), Dark blue (4–5 mm), Light blue (6–8 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Retention\u003c\/th\u003e\n\u003ctd\u003eSet screw clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eAnodized aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 5 \/ 10 \/ 20 pcs (select above)\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 both shafts you need to connect — your motor shaft (D1) and your driven shaft (D2). Select the variant whose D1 × D2 bore combination matches those measurements exactly. If both shafts are the same diameter, choose a same-bore variant (e.g., 5 mm × 5 mm). If they differ, choose a mixed-bore variant (e.g., 5 mm × 8 mm).\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan this coupling handle angular misalignment between the two shafts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The helical slot machined into the coupling body allows a small degree of angular and parallel misalignment — typically up to approximately 1°–3° angular and 0.1–0.3 mm parallel offset, depending on the coupling size. This makes it suitable for applications where perfect shaft alignment is difficult to achieve, such as hand-assembled CNC frames or 3D printer Z-axis assemblies.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs this coupling suitable for high-speed motor applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe aluminum alloy construction keeps rotational inertia low, making these couplings well-suited for moderate-speed applications such as stepper and servo motor drives. For very high-speed spindle applications (above approximately 3,000–5,000 RPM), verify that the coupling's balance and bore tolerance meet your system's requirements before use.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill the set screws loosen under vibration over time?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSet screws can loosen under sustained vibration if not properly secured. It is recommended to apply a small amount of thread-locking compound (such as medium-strength Loctite) to the set screws during installation, especially in applications with continuous vibration or frequent direction reversals. Periodically inspect and re-torque the set screws as part of routine maintenance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the dark red, dark blue, and light blue variants?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe color coding indicates the bore size group: dark red couplings cover bore diameters from 2 mm to 3.17 mm, dark blue couplings cover 4 mm to 5 mm bores, and light blue couplings cover 6 mm to 8 mm bores. The color makes it easy to identify the correct size group at a glance when working with multiple coupling sizes in the same workspace.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this coupling to connect a motor shaft to a lead screw on a 3D printer or CNC machine?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — this is one of the most common use cases. Select the bore combination that matches your stepper motor shaft diameter (commonly 5 mm for NEMA 17 motors) and your lead screw diameter (commonly 5 mm or 8 mm). The helical-cut design accommodates minor misalignment between the motor and lead screw, which is typical in DIY CNC and 3D printer builds.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow many pieces do I need to order, and can I buy in bulk?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEach listing offers packs of 1, 2, 5, 10, or 20 pieces. Select the quantity that matches your project needs — single pieces are ideal for prototyping or replacement, while 10- or 20-piece packs offer better per-unit value for production runs, classroom kits, or stocking a repair bench.\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 size and quantity 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 both shafts you need to connect — your motor shaft (D1) and your driven shaft (D2). Select the variant whose D1 × D2 bore combination matches those measurements exactly. If both shafts are the same diameter, choose a same-bore variant (e.g., 5 mm × 5 mm). If they differ, choose a mixed-bore variant (e.g., 5 mm × 8 mm).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can this coupling handle angular misalignment between the two shafts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The helical slot machined into the coupling body allows a small degree of angular and parallel misalignment — typically up to approximately 1°–3° angular and 0.1–0.3 mm parallel offset, depending on the coupling size.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this coupling suitable for high-speed motor applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The aluminum alloy construction keeps rotational inertia low, making these couplings well-suited for moderate-speed applications such as stepper and servo motor drives. For very high-speed spindle applications (above approximately 3,000–5,000 RPM), verify that the coupling's balance and bore tolerance meet your system's requirements before use.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will the set screws loosen under vibration over time?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Set screws can loosen under sustained vibration if not properly secured. It is recommended to apply a small amount of thread-locking compound to the set screws during installation, especially in applications with continuous vibration or frequent direction reversals.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the dark red, dark blue, and light blue variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The color coding indicates the bore size group: dark red couplings cover bore diameters from 2 mm to 3.17 mm, dark blue couplings cover 4 mm to 5 mm bores, and light blue couplings cover 6 mm to 8 mm bores.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this coupling to connect a motor shaft to a lead screw on a 3D printer or CNC machine?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — this is one of the most common use cases. Select the bore combination that matches your stepper motor shaft diameter (commonly 5 mm for NEMA 17 motors) and your lead screw diameter (commonly 5 mm or 8 mm). The helical-cut design accommodates minor misalignment between the motor and lead screw.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pieces do I need to order, and can I buy in bulk?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Each listing offers packs of 1, 2, 5, 10, or 20 pieces. Select the quantity that matches your project needs — single pieces are ideal for prototyping or replacement, while 10- or 20-piece packs offer better per-unit value for production runs or stocking a repair bench.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"Dark red   2-2mm \/ 1 pcs","offer_id":52422044844306,"sku":"kyh905-0","price":1.93,"currency_code":"USD","in_stock":true},{"title":"Dark red   2-2mm \/ 2 pcs","offer_id":52422044877074,"sku":"kyh905-1","price":2.71,"currency_code":"USD","in_stock":true},{"title":"Dark red   2-2mm \/ 5 pcs","offer_id":52422044909842,"sku":"kyh905-2","price":4.98,"currency_code":"USD","in_stock":true},{"title":"Dark red   2-2mm \/ 10 pcs","offer_id":52422044942610,"sku":"kyh905-3","price":9.47,"currency_code":"USD","in_stock":true},{"title":"Dark red   2-2mm \/ 20 pcs","offer_id":52422044975378,"sku":"kyh905-4","price":17.54,"currency_code":"USD","in_stock":true},{"title":"Dark red   2-2.3mm \/ 1 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