{"product_id":"jaw-shaft-coupling-spider-flexible-coupler-motor-d14-d20","title":"3\/4\/5\/6\/7\/8\/9\/10 mm Jaw Shaft Coupling Spider Flexible Coupler Motor D14D20","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eJaw Shaft Coupling Spider Flexible Coupler — Precision Motion Transfer for 3–10 mm Shafts\u003c\/h2\u003e\n\u003cp\u003eMisaligned motor shafts and rigid couplings are a leading cause of premature bearing failure and vibration noise in DIY CNC machines, 3D printers, and small automation rigs. Engineers and makers who need a forgiving, zero-backlash connection between two shafts of the same or different diameters rely on jaw-type flexible couplers with a polyurethane spider insert to absorb shock and compensate for minor angular and parallel misalignment.\u003c\/p\u003e\n\u003cp\u003eEach set consists of two aluminum alloy hubs and one polyurethane spider (jaw) insert. The D14 series measures 14 mm outer diameter × 22 mm length, accepting bore diameters from 3 mm to 8 mm (approximately 0.12–0.31 in). The D20 series measures 20 mm outer diameter in lengths of 25 mm or 30 mm, accepting bore diameters from 4 mm to 10 mm (approximately 0.16–0.39 in). Hubs are secured via set screws; no adhesive or press-fit required.\u003c\/p\u003e\n\u003cp\u003eTypical applications include stepper motor-to-leadscrew connections on CNC routers and laser engravers, servo motor shaft couplings on pick-and-place machines, and encoder shaft connections on test benches where vibration damping and easy disassembly are essential for long-term reliability.\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 NEMA 17 \/ NEMA 23 stepper motors, standard DC gear motors, and leadscrew assemblies with shaft diameters of 3–10 mm. Verify your d1 and d2 bore sizes before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These Jaw Shaft Coupling Spider Flexible Couplers\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003eDual-Hub Jaw Design\u003c\/strong\u003e\n\u003cp\u003eTwo interlocking aluminum hubs grip the spider insert from both sides, creating a positive mechanical connection that transmits torque while allowing up to ±1° angular and ~0.2 mm parallel misalignment compensation.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🛡️\u003c\/div\u003e\n\u003cstrong\u003ePolyurethane Spider Insert\u003c\/strong\u003e\n\u003cp\u003eThe elastomeric spider absorbs shock loads and dampens vibration between connected shafts, protecting motor bearings and reducing audible noise in continuous-duty applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eWide Bore Range — 3 to 10 mm\u003c\/strong\u003e\n\u003cp\u003eAvailable in same-bore and mixed-bore configurations (e.g., d3×d8, d5×d10), letting you couple shafts of different diameters without adapters. Select your exact d1 × d2 combination from the variant menu.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚡\u003c\/div\u003e\n\u003cstrong\u003eTwo OD Series: D14 and D20\u003c\/strong\u003e\n\u003cp\u003eThe compact D14 × L22 mm hub suits space-constrained enclosures; the D20 series in L25 mm and L30 mm lengths handles higher torque loads and larger shaft diameters up to 10 mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔧\u003c\/div\u003e\n\u003cstrong\u003eSet-Screw Clamping — No Press Fit Needed\u003c\/strong\u003e\n\u003cp\u003eEach hub is secured with a radial set screw, allowing tool-free shaft swaps during prototyping and maintenance without damaging shaft surfaces.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🏗️\u003c\/div\u003e\n\u003cstrong\u003eAluminum Alloy Hubs\u003c\/strong\u003e\n\u003cp\u003eLightweight yet rigid aluminum alloy construction keeps rotational inertia low — critical for high-acceleration stepper and servo motor applications where response time matters.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — Jaw Shaft Flexible Coupler\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eJaw \/ Spider Flexible Shaft 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 (OD)\u003c\/th\u003e\n\u003ctd\u003eD14 mm or D20 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupling Length\u003c\/th\u003e\n\u003ctd\u003eL22 mm (D14 series) \/ L25 mm or L30 mm (D20 series)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter d1\u003c\/th\u003e\n\u003ctd\u003e3–10 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter d2\u003c\/th\u003e\n\u003ctd\u003e3–10 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Combination\u003c\/th\u003e\n\u003ctd\u003eSame-bore or mixed-bore (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFastening Method\u003c\/th\u003e\n\u003ctd\u003eRadial Set Screw\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 mm\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 Set\u003c\/th\u003e\n\u003ctd\u003e2 pcs (2 hubs + 1 spider insert)\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 right OD size — D14 or D20?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eChoose D14 × L22 mm if your shaft diameters are 3–8 mm and you need a compact coupler for tight spaces such as 3D printer Z-axis assemblies. Choose D20 × L25 mm or D20 × L30 mm if your shafts are 4–10 mm and you need higher torque capacity or a longer coupling body for easier alignment. When in doubt, the D20 series offers more clamping surface and is generally preferred for NEMA 23 motors and larger leadscrews.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I couple two shafts of different diameters?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These couplers are available in mixed-bore configurations — for example, d3 × d8 or d5 × d10 — so you can connect a motor shaft and a leadscrew that have different diameters without using a reducer or adapter. Simply select the d1 × d2 combination that matches your two shaft sizes from the variant dropdown.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the connection? Will the spider insert slip under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe set screw on each hub bites directly into the shaft, providing a positive mechanical lock. The polyurethane spider transmits torque through interlocking jaw fingers rather than friction alone, so the connection does not rely on adhesive or interference fit. For typical stepper and servo motor loads in CNC and automation applications, the clamping force of the set screw is sufficient. Ensure the set screw is tightened to the manufacturer's recommended torque and that the shaft surface is clean and free of oil.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs this coupler corrosion-resistant for outdoor or humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe aluminum alloy hubs offer good natural oxidation resistance and are suitable for indoor workshop and light industrial environments. For prolonged exposure to moisture, salt spray, or corrosive chemicals, consider applying a thin coat of anti-corrosion spray to the hub exterior. The polyurethane spider insert is inherently resistant to oils and mild solvents.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat motors and machines are these couplers compatible with?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese jaw couplers are widely used with NEMA 17 stepper motors (typically 5 mm shaft), NEMA 23 stepper motors (typically 6.35 mm or 8 mm shaft), small DC gear motors, servo motors, and encoder shafts in CNC routers, laser engravers, 3D printers, pick-and-place machines, and general automation rigs. Always verify your motor shaft diameter and leadscrew bore before selecting a variant.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I install and remove the coupler?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSlide each hub onto its respective shaft, align the hub face to the desired position, and tighten the set screw with an appropriate hex key (Allen wrench). Insert the polyurethane spider between the two hubs by pressing the jaw fingers into the mating slots — no tools required for the spider. To remove, loosen the set screws and slide the hubs off. The spider can be replaced independently if worn without replacing the aluminum hubs.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is included in each order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEach order includes 2 aluminum alloy hubs and 1 polyurethane spider insert (jaw element), forming one complete flexible coupling assembly. The quantity listed in the variant selector (2 pcs) refers to this complete set of 2 hubs + 1 spider.\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 OD × Length and d1 × d2 bore size 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 OD size — D14 or D20?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Choose D14 × L22 mm if your shaft diameters are 3–8 mm and you need a compact coupler for tight spaces. Choose D20 × L25 mm or D20 × L30 mm if your shafts are 4–10 mm and you need higher torque capacity. The D20 series is generally preferred for NEMA 23 motors and larger leadscrews.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I couple two shafts of different diameters?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These couplers are available in mixed-bore configurations such as d3×d8 or d5×d10, so you can connect a motor shaft and a leadscrew of different diameters without an adapter.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is the connection? Will the spider insert slip under load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The set screw on each hub provides a positive mechanical lock. The polyurethane spider transmits torque through interlocking jaw fingers rather than friction alone. Ensure the set screw is tightened correctly and the shaft surface is clean.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this coupler corrosion-resistant for outdoor or humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The aluminum alloy hubs offer good natural oxidation resistance for indoor and light industrial use. For prolonged moisture exposure, apply an anti-corrosion spray. The polyurethane spider is resistant to oils and mild solvents.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What motors and machines are these couplers compatible with?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Compatible with NEMA 17 and NEMA 23 stepper motors, small DC gear motors, servo motors, and encoder shafts in CNC routers, laser engravers, 3D printers, and automation rigs. Always verify shaft diameter before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I install and remove the coupler?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Slide each hub onto its shaft, align, and tighten the set screw with a hex key. Press the polyurethane spider between the two hubs by hand. To remove, loosen the set screws and slide the hubs off. The spider can be replaced independently.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is included in each order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Each order includes 2 aluminum alloy hubs and 1 polyurethane spider insert, forming one complete flexible coupling assembly.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"D14 x L22mm\/d 3 - d 8 \/ Remarks Bore size range Min. ≤ d ≤ Max. \/ 2 pcs","offer_id":52422782877970,"sku":"FOB08296x2","price":19.09,"currency_code":"USD","in_stock":true},{"title":"D14 x L22mm\/d 3 - d 3 \/ Remarks Bore size range Min. ≤ d ≤ Max. \/ 2 pcs","offer_id":52422782910738,"sku":"FOB08297x2","price":19.09,"currency_code":"USD","in_stock":true},{"title":"D14 x L22mm\/d 4 - d 4 \/ Remarks Bore size range Min. ≤ d ≤ Max. \/ 2 pcs","offer_id":52422782943506,"sku":"FOB08298x2","price":19.09,"currency_code":"USD","in_stock":true},{"title":"D14 x L22mm\/d 5 - 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