{"product_id":"flexible-plum-spider-jaw-coupling-cnc-shaft-coupler-stepper","title":"Flexible Plum Spider Jaw Coupling CNC Shaft Coupler Stepper 6.35\/8\/12\/17mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eFlexible Plum Spider Jaw Coupling — Precision Shaft Coupler for CNC \u0026amp; Stepper Motors\u003c\/h2\u003e\n\u003cp\u003eMisaligned shafts and vibration-induced positioning errors are a constant headache for CNC builders, 3D printer enthusiasts, and automation engineers. This flexible plum spider jaw coupling is engineered for DIYers and professionals who need a reliable, zero-backlash connection between motor shafts and lead screws — without the rigidity that causes premature bearing wear.\u003c\/p\u003e\n\u003cp\u003eEach coupler consists of two aluminum alloy hubs and a polyurethane spider insert. Available in outer diameters from 25mm to 40mm (approx. 0.98\" to 1.57\") and lengths from 30mm to 66mm (approx. 1.18\" to 2.60\"), with shaft bore options spanning 6.35mm, 8mm, 12mm, and 17mm to suit a wide range of motor and lead screw combinations.\u003c\/p\u003e\n\u003cp\u003eIdeal for CNC router Z-axis lead screw connections, NEMA stepper motor shaft coupling on 3D printers, and servo motor to encoder shaft alignment in automation panels — all scenarios where angular and parallel misalignment compensation is critical.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e Compatible with NEMA 17, NEMA 23, and NEMA 34 stepper motors, as well as standard servo motors with 6.35mm, 8mm, 12mm, or 17mm output shafts. Fits T8, T12, and similar lead screw diameters.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Flexible Plum Spider Jaw Couplings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eSpider Insert Vibration Damping\u003c\/strong\u003e\u003cp\u003eThe polyurethane spider element absorbs torsional shock and vibration between hubs, protecting motor bearings and reducing positioning noise 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\u003cstrong\u003eMulti-Size Shaft Compatibility\u003c\/strong\u003e\u003cp\u003eShaft bore options of 6.35mm, 8mm, 12mm, and 17mm cover the most common stepper and servo motor output shaft diameters, eliminating the need for adapters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eAluminum Alloy Hubs with Set Screws\u003c\/strong\u003e\u003cp\u003eBoth hubs are machined from aluminum alloy and secured with radial set screws, providing a firm grip on the shaft without permanent deformation or slippage under load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e↔️\u003c\/span\u003e\u003cstrong\u003eMisalignment Compensation\u003c\/strong\u003e\u003cp\u003eThe jaw coupling design accommodates angular, parallel, and axial misalignment between connected shafts — reducing stress on motor bearings and extending drivetrain service life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eAvailable in Multi-Pack Quantities\u003c\/strong\u003e\u003cp\u003eOrder 1, 2, 3, or 5 units per listing to stock your workshop or complete multi-axis builds without separate orders.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eLow Inertia, Responsive Coupling\u003c\/strong\u003e\u003cp\u003eThe lightweight aluminum construction keeps rotational inertia low, ensuring fast motor response and accurate positioning — essential for high-speed CNC and pick-and-place systems.\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 — Flexible Jaw Shaft Coupler\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eFlexible Plum Spider Jaw Coupling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Material\u003c\/th\u003e\n\u003ctd\u003eAluminum Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpider Insert Material\u003c\/th\u003e\n\u003ctd\u003ePolyurethane (PU)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (D)\u003c\/th\u003e\n\u003ctd\u003eD25mm \/ D30mm \/ D40mm (See variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupler Length (L)\u003c\/th\u003e\n\u003ctd\u003eL30mm \/ L35mm \/ L40mm \/ L45mm \/ L66mm (See variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Bore Diameter\u003c\/th\u003e\n\u003ctd\u003e6.35mm \/ 8mm \/ 12mm \/ 17mm (See variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFastening Method\u003c\/th\u003e\n\u003ctd\u003eRadial Set Screws\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMisalignment Tolerance\u003c\/th\u003e\n\u003ctd\u003eAngular: typically ±1°; Parallel: typically 0.2–0.5mm\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\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 3 \/ 5 (See variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\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\u003csummary\u003eHow do I choose the right coupler dimension for my stepper motor?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the shaft bore to your motor's output shaft diameter (e.g., NEMA 17 typically uses 5mm or 6.35mm, NEMA 23 uses 6.35mm or 8mm, NEMA 34 uses 12mm or 14mm). Then select the outer diameter (D) and length (L) based on the available space in your machine's motor mount area. Larger D and L values generally handle higher torque.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan this coupler handle both same-diameter and different-diameter shaft connections?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Each hub is bored independently, so you can connect two shafts of the same diameter (e.g., 8mm to 8mm) or two different diameters (e.g., 6.35mm to 12mm) depending on the variant you select. Check the Shaft Diameter option when adding to cart.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs the spider insert replaceable if it wears out?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe polyurethane spider insert sits between the two hubs and can typically be replaced without replacing the entire coupler. However, replacement inserts are sold separately. Contact us to confirm availability for your specific coupler size.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow strong is this coupling — what torque can it handle?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eTorque capacity varies by coupler size. Larger diameter couplers (D40mm) handle significantly more torque than smaller ones (D25mm). For typical CNC and 3D printer stepper motor applications (holding torque up to ~3 Nm for NEMA 23), the D30mm and D40mm variants are well-suited. Contact us to confirm for high-torque servo applications.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWill this coupler resist corrosion in humid or outdoor environments?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe aluminum alloy hubs have a natural anodized finish that provides moderate corrosion resistance suitable for indoor workshops, enclosed CNC enclosures, and light-duty outdoor use. For harsh chemical or salt-spray environments, additional protective coating is recommended.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do I install and tighten the set screws correctly?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSlide each hub onto its respective shaft, align the coupler so the spider insert seats evenly between both hubs, then tighten the set screws with an appropriate hex key (Allen wrench). Apply moderate torque — over-tightening can deform the shaft bore. Ensure the shaft is fully inserted to the hub's depth before tightening.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs this compatible with T8 or T12 lead screws used in 3D printers?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. T8 lead screws have an 8mm outer diameter and T12 lead screws have a 12mm outer diameter, both of which are available as shaft bore options in this listing. Pair with the matching motor shaft bore on the other hub for a direct, adapter-free connection.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e\u003cp\u003e🛒 Select your Coupler Dimension, Shaft Diameter, and Amount above, then add to cart.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"D30mm x L35mm \/ 6.35mm to 6.35mm \/ 1","offer_id":52421853643026,"sku":"GY$$$BJT02673x1","price":11.37,"currency_code":"USD","in_stock":true},{"title":"D40mm x L45mm \/ 12mm to 12mm \/ 1","offer_id":52421853675794,"sku":"GY$$$BJT02674x1","price":14.38,"currency_code":"USD","in_stock":true},{"title":"D30mm x L35mm \/ 8mm to 8mm \/ 1","offer_id":52421853708562,"sku":"GY$$$BJT02675x1","price":11.48,"currency_code":"USD","in_stock":true},{"title":"D25mm x L30mm \/ 6.35mm to 6.35mm \/ 1","offer_id":52421853741330,"sku":"GY$$$BJT02676x1","price":9.15,"currency_code":"USD","in_stock":true},{"title":"D30mm x L40mm \/ 12mm to 12mm \/ 1","offer_id":52421853774098,"sku":"GY$$$BJT02677x1","price":11.93,"currency_code":"USD","in_stock":true},{"title":"D30mm x L40mm \/ 8mm to 8mm \/ 1","offer_id":52421853806866,"sku":"GY$$$BJT02678x1","price":11.85,"currency_code":"USD","in_stock":true},{"title":"D40mm x L66mm \/ 17mm to 17mm \/ 1","offer_id":52421853839634,"sku":"GY$$$BJT02679x1","price":14.38,"currency_code":"USD","in_stock":true},{"title":"D30mm x L35mm \/ 6.35mm to 6.35mm \/ 2","offer_id":52421853872402,"sku":"GY$$$BJT02673x2","price":21.84,"currency_code":"USD","in_stock":true},{"title":"D40mm x L45mm \/ 12mm to 12mm \/ 2","offer_id":52421853905170,"sku":"GY$$$BJT02674x2","price":27.84,"currency_code":"USD","in_stock":true},{"title":"D30mm x L35mm \/ 8mm to 8mm \/ 2","offer_id":52421853937938,"sku":"GY$$$BJT02675x2","price":22.05,"currency_code":"USD","in_stock":true},{"title":"D25mm x L30mm \/ 6.35mm to 6.35mm \/ 2","offer_id":52421853970706,"sku":"GY$$$BJT02676x2","price":17.3,"currency_code":"USD","in_stock":true},{"title":"D30mm x L40mm \/ 12mm to 12mm \/ 2","offer_id":52421854003474,"sku":"GY$$$BJT02677x2","price":22.9,"currency_code":"USD","in_stock":true},{"title":"D30mm x L40mm \/ 8mm to 8mm \/ 2","offer_id":52421854036242,"sku":"GY$$$BJT02678x2","price":22.75,"currency_code":"USD","in_stock":true},{"title":"D40mm x L66mm \/ 17mm to 17mm \/ 2","offer_id":52421854069010,"sku":"GY$$$BJT02679x2","price":27.84,"currency_code":"USD","in_stock":true},{"title":"D30mm x L35mm \/ 6.35mm to 6.35mm \/ 3","offer_id":52421854101778,"sku":"GY$$$BJT02673x3","price":32.27,"currency_code":"USD","in_stock":true},{"title":"D40mm x L45mm \/ 12mm to 12mm \/ 3","offer_id":52421854134546,"sku":"GY$$$BJT02674x3","price":41.32,"currency_code":"USD","in_stock":true},{"title":"D30mm x L35mm \/ 8mm to 8mm \/ 3","offer_id":52421854167314,"sku":"GY$$$BJT02675x3","price":32.59,"currency_code":"USD","in_stock":true},{"title":"D25mm x L30mm \/ 6.35mm to 6.35mm \/ 3","offer_id":52421854200082,"sku":"GY$$$BJT02676x3","price":25.47,"currency_code":"USD","in_stock":true},{"title":"D30mm x L40mm \/ 12mm to 12mm \/ 3","offer_id":52421854232850,"sku":"GY$$$BJT02677x3","price":33.9,"currency_code":"USD","in_stock":true},{"title":"D30mm x L40mm \/ 8mm to 8mm \/ 3","offer_id":52421854265618,"sku":"GY$$$BJT02678x3","price":33.69,"currency_code":"USD","in_stock":true},{"title":"D40mm x L66mm \/ 17mm to 17mm \/ 3","offer_id":52421854298386,"sku":"GY$$$BJT02679x3","price":41.32,"currency_code":"USD","in_stock":true},{"title":"D30mm x L35mm \/ 6.35mm to 6.35mm \/ 5","offer_id":52421854331154,"sku":"GY$$$BJT02673x5","price":53.16,"currency_code":"USD","in_stock":true},{"title":"D40mm x L45mm \/ 12mm to 12mm \/ 5","offer_id":52421854363922,"sku":"GY$$$BJT02674x5","price":68.23,"currency_code":"USD","in_stock":true},{"title":"D30mm x L35mm \/ 8mm to 8mm \/ 5","offer_id":52421854396690,"sku":"GY$$$BJT02675x5","price":53.68,"currency_code":"USD","in_stock":true},{"title":"D25mm x L30mm \/ 6.35mm to 6.35mm \/ 5","offer_id":52421854429458,"sku":"GY$$$BJT02676x5","price":41.86,"currency_code":"USD","in_stock":true},{"title":"D30mm x L40mm \/ 12mm to 12mm \/ 5","offer_id":52421854462226,"sku":"GY$$$BJT02677x5","price":55.86,"currency_code":"USD","in_stock":true},{"title":"D30mm x L40mm \/ 8mm to 8mm \/ 5","offer_id":52421854494994,"sku":"GY$$$BJT02678x5","price":55.52,"currency_code":"USD","in_stock":true},{"title":"D40mm x L66mm \/ 17mm to 17mm \/ 5","offer_id":52421854527762,"sku":"GY$$$BJT02679x5","price":68.23,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture6of8_ddcc8670-4ca1-4738-8f78-4ea1f8568cab.jpg?v=1783335164","url":"https:\/\/homediyer.com\/products\/flexible-plum-spider-jaw-coupling-cnc-shaft-coupler-stepper","provider":"HomeDIYer","version":"1.0","type":"link"}