{"product_id":"d40-l50mm-flexible-spider-shaft-coupling-cnc-stepper-motor-coupler","title":"D40 L50mm Flexible Spider Shaft Coupling CNC Stepper Motor Coupler Hole 6mm~22mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eD40 L50mm Flexible Spider Shaft Coupling — Precision Motion for CNC \u0026amp; Stepper Motor Builds\u003c\/h2\u003e\n\u003cp\u003eWhen shaft misalignment or vibration causes positioning errors in your CNC router, 3D printer, or stepper motor drive system, a rigid coupler becomes the weakest link. The D40 L50mm Flexible Spider Shaft Coupling is engineered for builders and machine operators who need reliable torque transmission without sacrificing flexibility — absorbing angular, parallel, and axial misalignment so your motion system stays accurate under load.\u003c\/p\u003e\n\u003cp\u003eThis jaw-type spider coupling consists of two aluminum alloy hubs and a polyurethane spider insert (jaw elastomer). The outer diameter is 40mm (approx. 1.57 in) and the overall length is 50mm (approx. 1.97 in). Bore sizes span 8mm to 22mm (approx. 0.31–0.87 in), with both same-bore and cross-bore configurations available across 120+ variants to match your exact shaft pairing.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC stepper motor shaft coupling for lead screw drives, servo motor coupling in laser engravers and plasma tables, and flexible shaft connector applications in DIY automation rigs where vibration damping and zero-backlash performance are critical to part accuracy.\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 stepper motors (NEMA 17, NEMA 23, NEMA 34), servo motors, and lead screw shafts with bore diameters from 8mm to 22mm. Verify your shaft diameter before selecting a variant.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Flexible Spider Shaft Couplings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003eJaw-Type Spider Design\u003c\/strong\u003e\n\u003cp\u003eTwo-piece aluminum hub with polyurethane spider insert transmits torque while absorbing shock loads — reducing wear on motor bearings and linear guides.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eWide Bore Range: 8mm–22mm\u003c\/strong\u003e\n\u003cp\u003eOver 120 shaft diameter combinations available, including same-bore (e.g., 8×8mm) and cross-bore (e.g., 8×12mm) pairings for mixed-shaft motor-to-leadscrew connections.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003eMisalignment Compensation\u003c\/strong\u003e\n\u003cp\u003eAccommodates angular misalignment (typically up to 1°), parallel offset, and axial displacement — protecting your drive train from binding caused by imperfect shaft alignment.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔇\u003c\/div\u003e\n\u003cstrong\u003eVibration Damping Spider Insert\u003c\/strong\u003e\n\u003cp\u003eThe polyurethane elastomer spider insert absorbs vibration and reduces noise during high-speed stepper motor operation, contributing to smoother motion and quieter machine cycles.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚖️\u003c\/div\u003e\n\u003cstrong\u003eLightweight Aluminum Alloy Hubs\u003c\/strong\u003e\n\u003cp\u003eMachined aluminum alloy construction keeps rotational inertia low — important for responsive acceleration and deceleration in CNC and 3D printing applications.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔧\u003c\/div\u003e\n\u003cstrong\u003eSet Screw Clamping\u003c\/strong\u003e\n\u003cp\u003eEach hub is secured to the shaft via set screws, allowing tool-free disassembly and reassembly for maintenance, motor swaps, or lead screw replacements.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Flexible Spider Shaft Coupling\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupling Type\u003c\/th\u003e\n\u003ctd\u003eJaw \/ Spider (Oldham-style elastomer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (D)\u003c\/th\u003e\n\u003ctd\u003e40mm (1.57 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOverall Length (L)\u003c\/th\u003e\n\u003ctd\u003e50mm (1.97 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Range\u003c\/th\u003e\n\u003ctd\u003e8mm – 22mm (0.31 – 0.87 in)\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) elastomer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Fixation\u003c\/th\u003e\n\u003ctd\u003eSet screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMisalignment Tolerance\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Torque\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural anodized \/ machined aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 Pcs\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\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right shaft diameter combination?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure both shafts you need to connect — your motor shaft and your lead screw or driven shaft. Select the variant that matches both diameters (e.g., 8mm × 12mm means one hub bores 8mm and the other bores 12mm). If both shafts are the same size, choose a same-bore variant like 10mm × 10mm.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat types of misalignment can this coupling handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe spider jaw design compensates for angular misalignment (slight angle between shaft centerlines), parallel offset (shafts running side by side but not collinear), and axial displacement (shafts moving toward or away from each other). For best results, minimize misalignment during installation — the coupling absorbs residual error, not gross misalignment.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this coupling zero-backlash?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSpider jaw couplings with a polyurethane insert offer near-zero backlash under normal CNC and stepper motor loads. The elastomer spider fills the gap between the jaw teeth, transmitting torque with minimal play. For ultra-precision applications requiring absolute zero backlash, consider a rigid beam coupling instead.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this fit NEMA 17 and NEMA 23 stepper motors?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. NEMA 17 motors typically have a 5mm shaft, but many upgraded versions use 8mm shafts. NEMA 23 motors commonly use 6.35mm (1\/4 in) or 8mm shafts. Select the bore variant that matches your specific motor shaft diameter. The 40mm outer diameter fits within standard motor mount clearances for both NEMA 17 and NEMA 23 frames.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan the spider insert be replaced separately?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe polyurethane spider insert is a separate component between the two aluminum hubs. In many jaw coupling systems, the insert can be replaced without replacing the hubs. Check that the spider geometry matches before ordering a replacement insert, as jaw tooth profiles vary by manufacturer.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this coupling suitable for high-speed applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis D40 L50mm coupling is designed for low-to-medium speed CNC and stepper motor applications. For high-speed spindle or servo applications exceeding several thousand RPM, verify the maximum RPM rating with the specific variant. The aluminum hubs and PU spider are well-suited for the speed ranges typical of CNC routers, laser engravers, and 3D printer axis drives.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I install and secure the coupling to the shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSlide each hub onto its respective shaft, aligning the set screw hole with a flat on the shaft if present. Insert the polyurethane spider between the two hubs, meshing the jaw teeth. Tighten the set screws with an appropriate hex key to the recommended torque for your shaft diameter. Ensure both hubs are flush and the spider is fully seated before running the motor.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Shaft 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 the right shaft diameter combination?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure both shafts you need to connect — your motor shaft and your lead screw or driven shaft. Select the variant that matches both diameters. If both shafts are the same size, choose a same-bore variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What types of misalignment can this coupling handle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The spider jaw design compensates for angular misalignment, parallel offset, and axial displacement. For best results, minimize misalignment during installation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this coupling zero-backlash?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Spider jaw couplings with a polyurethane insert offer near-zero backlash under normal CNC and stepper motor loads. The elastomer spider fills the gap between the jaw teeth, transmitting torque with minimal play.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this fit NEMA 17 and NEMA 23 stepper motors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. NEMA 17 motors typically use 5mm or 8mm shafts; NEMA 23 motors commonly use 6.35mm or 8mm shafts. Select the bore variant matching your motor shaft diameter.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can the spider insert be replaced separately?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The polyurethane spider insert is a separate component between the two aluminum hubs and can typically be replaced without replacing the hubs. Verify the jaw tooth profile matches before ordering a replacement.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this coupling suitable for high-speed applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This coupling is designed for low-to-medium speed CNC and stepper motor applications. It is well-suited for CNC routers, laser engravers, and 3D printer axis drives.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I install and secure the coupling to the shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Slide each hub onto its shaft, insert the polyurethane spider between the hubs meshing the jaw teeth, then tighten the set screws with a hex key. Ensure both hubs are flush and the spider is fully seated before running the motor.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"8mm X 8mm \/ 1 Pcs","offer_id":52421978554642,"sku":"LRP18518x1","price":18.78,"currency_code":"USD","in_stock":true},{"title":"9mm X 9mm \/ 1 Pcs","offer_id":52421978587410,"sku":"LRP18519x1","price":18.78,"currency_code":"USD","in_stock":true},{"title":"10mm X 10mm \/ 1 Pcs","offer_id":52421978620178,"sku":"LRP18520x1","price":18.78,"currency_code":"USD","in_stock":true},{"title":"11mm X 11mm \/ 1 Pcs","offer_id":52421978652946,"sku":"LRP18521x1","price":18.78,"currency_code":"USD","in_stock":true},{"title":"12mm X 12mm \/ 1 Pcs","offer_id":52421978685714,"sku":"LRP18522x1","price":18.78,"currency_code":"USD","in_stock":true},{"title":"12.7mm X 12.7mm \/ 1 Pcs","offer_id":52421978718482,"sku":"LRP18523x1","price":18.78,"currency_code":"USD","in_stock":true},{"title":"13mm X 13mm \/ 1 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