{"product_id":"aluminum-plum-flexible-shaft-elastic-coupling-coupler-cnc-stepper-motor-all-size","title":"Aluminum Plum Flexible Shaft Elastic Coupling Coupler CNC Stepper Motor-All Size","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eAluminum Plum Flexible Shaft Coupling — Precision Motion for CNC \u0026amp; Stepper Motor Builds\u003c\/h2\u003e\n\u003cp\u003eWhen shaft misalignment or vibration throws off your CNC router, 3D printer, or motor-driven machine, the coupling is often the first thing to fail. Engineers, makers, and machine builders who demand consistent torque transmission and long service life rely on aluminum plum flexible shaft couplings to bridge the gap between motor and lead screw without sacrificing accuracy.\u003c\/p\u003e\n\u003cp\u003eEach coupling is machined from aluminum alloy with a polyurethane (PU) spider insert seated between the two hubs. Outer diameters range from 30 mm to 40 mm (~1.18\"–1.57\"), heights from 30 mm to 55 mm (~1.18\"–2.17\"), and inner bore sizes span 6 mm × 6 mm up to 19 mm × 19 mm (square bores) as well as mixed rectangular bores — covering the most common NEMA stepper motor shaft and lead-screw combinations. Set screws lock each hub securely onto the shaft.\u003c\/p\u003e\n\u003cp\u003eTypical applications include CNC router Z-axis lead-screw coupling, NEMA 17\/23 stepper motor to ball-screw connections, laser engraver axis drives, and light-duty servo motor linkages where angular and parallel misalignment compensation is needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits NEMA 17, NEMA 23, and similarly sized stepper motors. Verify your motor shaft diameter and lead-screw bore before selecting a model. See variant options for available OD \/ Height \/ ID combinations.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Aluminum Plum 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\u003eDual-Hub Aluminum Construction\u003c\/strong\u003e\n\u003cp\u003eBoth hubs are machined from aluminum alloy for a lightweight yet rigid frame that resists deformation under continuous rotational load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌸\u003c\/span\u003e \u003cstrong\u003ePolyurethane Spider Insert\u003c\/strong\u003e\n\u003cp\u003eThe PU plum-shaped spider absorbs angular, parallel, and axial misalignment while dampening vibration — protecting both motor bearings and lead-screw nuts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Size Range\u003c\/strong\u003e\n\u003cp\u003eOD 30 mm and 40 mm bodies with bore IDs from 6 × 6 mm to 19 × 19 mm cover the most common CNC and 3D-printer shaft pairings in a single product line.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e \u003cstrong\u003eSet-Screw Locking\u003c\/strong\u003e\n\u003cp\u003eRadial set screws on each hub clamp firmly onto flat-sided or round shafts, preventing slippage during direction reversals and rapid acceleration cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔇\u003c\/span\u003e \u003cstrong\u003eVibration \u0026amp; Noise Damping\u003c\/strong\u003e\n\u003cp\u003eThe flexible spider decouples motor resonance from the driven axis, reducing audible noise and extending the service life of downstream mechanical components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eEasy Shaft Swap\u003c\/strong\u003e\n\u003cp\u003eSplit-hub design allows installation and removal without disassembling the full drive train — ideal for prototyping, maintenance, and iterative machine builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Plum Flexible Shaft Coupling\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial — Hubs\u003c\/th\u003e\n\u003ctd\u003eAluminum alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial — Spider Insert\u003c\/th\u003e\n\u003ctd\u003ePolyurethane (PU)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e30 mm (~1.18\") \/ 40 mm (~1.57\") — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeight\u003c\/th\u003e\n\u003ctd\u003e30–55 mm (~1.18\"–2.17\") — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Bore (ID)\u003c\/th\u003e\n\u003ctd\u003e6×6 mm to 19×19 mm (square \u0026amp; rectangular) — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLocking Method\u003c\/th\u003e\n\u003ctd\u003eRadial set screws\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural anodized aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMisalignment Tolerance\u003c\/th\u003e\n\u003ctd\u003eAngular: typically ±1°; Parallel: typically 0.2–0.5 mm\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; light-duty servo motors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\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\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 model for my stepper motor?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the Inner Diameter (ID) of the coupling to your motor shaft size and lead-screw bore. For example, if your NEMA 17 motor has a 5 mm round shaft and your lead screw has an 8 mm diameter, select the variant whose ID pair covers those two dimensions. Check the \"Choose Model\" dropdown — each option lists OD, Height, and both bore IDs clearly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan this coupling handle angular and parallel shaft misalignment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The polyurethane spider insert is specifically designed to accommodate angular misalignment of typically ±1° and parallel (radial) misalignment of approximately 0.2–0.5 mm. For best results, minimize misalignment during installation to extend spider life and maintain positioning accuracy.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the aluminum hub corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy has natural oxidation resistance suitable for indoor workshop and enclosed machine environments. For high-humidity or outdoor applications, consider applying a light protective coating. The PU spider insert is also resistant to oils and mild solvents commonly found in machining environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill the set screws work on a round shaft without a flat?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, the set screws can grip round shafts, though adding a small flat (D-cut) to the shaft with a file significantly improves torque retention and prevents rotational slippage under load. For CNC and 3D-printer applications with moderate torque, round shafts typically work without modification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the OD 30 mm and OD 40 mm versions?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe OD 40 mm couplings are physically larger and generally accommodate larger bore IDs (up to 19 × 19 mm), making them suited for NEMA 23 motors and larger lead screws. The OD 30 mm versions are more compact and cover smaller bore combinations, ideal for NEMA 17 and space-constrained builds. Both share the same plum-spider design and locking mechanism.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I replace just the spider insert if it wears out?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe polyurethane spider is a separate component seated between the two hubs. In many cases it can be replaced independently without purchasing a new complete coupling — simply loosen the set screws, slide the hubs apart, swap the spider, and reassemble. Contact us to confirm spider availability for your specific model.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this coupling suitable for high-speed spindle or servo applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese couplings are designed for the moderate-speed, moderate-torque demands of CNC stepper motor and lead-screw drives. For high-speed spindle or high-torque servo applications, please contact us to confirm suitability, as maximum RPM and torque ratings vary by model size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your model (OD \/ Height \/ ID) and quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"OD:30mm Height：35mm ID：6.35x6.35mm \/ 1pcs","offer_id":52421788238098,"sku":"GLFBLFFBJT01258x1","price":21.95,"currency_code":"USD","in_stock":true},{"title":"OD:30mm Height：40mm ID：8x8mm \/ 1pcs","offer_id":52421788270866,"sku":"GLFBLFFBJT01260x1","price":21.95,"currency_code":"USD","in_stock":true},{"title":"OD:40mm Height：55mm ID：19x19mm \/ 1pcs","offer_id":52421788303634,"sku":"GLFBLFFBJT01262x1","price":28.49,"currency_code":"USD","in_stock":true},{"title":"OD:40mm Height：55mm ID：18x18mm \/ 1pcs","offer_id":52421788336402,"sku":"GLFBLFFBJT01264x1","price":28.49,"currency_code":"USD","in_stock":true},{"title":"OD:40mm Height：55mm ID：17x17mm \/ 1pcs","offer_id":52421788369170,"sku":"GLFBLFFBJT01266x1","price":28.49,"currency_code":"USD","in_stock":true},{"title":"OD:40mm Height：55mm ID：15x15mm \/ 1pcs","offer_id":52421788401938,"sku":"GLFBLFFBJT01267x1","price":28.49,"currency_code":"USD","in_stock":true},{"title":"OD:40mm Height：55mm ID：14x14mm \/ 1pcs","offer_id":52421788434706,"sku":"GLFBLFFBJT01268x1","price":28.49,"currency_code":"USD","in_stock":true},{"title":"OD:40mm Height：55mm ID：12x12mm \/ 1pcs","offer_id":52421788467474,"sku":"GLFBLFFBJT01269x1","price":28.49,"currency_code":"USD","in_stock":true},{"title":"OD:30mm Height：30mm ID：6x6mm \/ 1pcs","offer_id":52421788500242,"sku":"GLFBLFFBJT01270x1","price":21.95,"currency_code":"USD","in_stock":true},{"title":"OD:30mm Height：40mm ID：12x12mm \/ 1pcs","offer_id":52421788533010,"sku":"GLFBLFFBJT01271x1","price":21.95,"currency_code":"USD","in_stock":true},{"title":"OD:40mm Height：55mm ID：10x10mm \/ 1pcs","offer_id":52421788565778,"sku":"GLFBLFFBJT01272x1","price":28.49,"currency_code":"USD","in_stock":true},{"title":"OD:30mm Height：35mm ID：8x8mm \/ 1pcs","offer_id":52421788598546,"sku":"GLFBLFFBJT01273x1","price":18.84,"currency_code":"USD","in_stock":true},{"title":"OD:30mm Height：35mm ID：14x14mm \/ 1pcs","offer_id":52421788631314,"sku":"GLFBLFFBJT01274x1","price":21.95,"currency_code":"USD","in_stock":true},{"title":"OD:30mm Height：42mm ID：6x16mm \/ 1pcs","offer_id":52421788664082,"sku":"GLFBLFFBJT01276x1","price":22.74,"currency_code":"USD","in_stock":true},{"title":"OD:30mm Height：35mm ID：10x10mm \/ 1pcs","offer_id":52421788696850,"sku":"GLFBLFFBJT01277x1","price":21.95,"currency_code":"USD","in_stock":true},{"title":"OD:40mm Height：55mm ID：8x8mm \/ 1pcs","offer_id":52421788729618,"sku":"GLFBLFFBJT01278x1","price":28.49,"currency_code":"USD","in_stock":true},{"title":"OD:40mm Height：55mm ID：8x22mm \/ 1pcs","offer_id":52421788762386,"sku":"GLFBLFFBJT01279x1","price":28.49,"currency_code":"USD","in_stock":true},{"title":"OD:40mm Height：50mm ID：15x18mm \/ 1pcs","offer_id":52421788795154,"sku":"GLFBLFFBJT01280x1","price":28.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-03_aa5eb6e1-1c19-48e9-8281-ac0161a3226e.jpg?v=1783325670","url":"https:\/\/homediyer.com\/products\/aluminum-plum-flexible-shaft-elastic-coupling-coupler-cnc-stepper-motor-all-size","provider":"HomeDIYer","version":"1.0","type":"link"}