{"product_id":"flexible-plum-coupling-servo-motor-jaw-spider-shaft-coupler-cnc-3d-printer","title":"Flexible Plum Coupling Servo Motor Jaw Spider Shaft Coupler for CNC 3D Printer","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eFlexible Plum Shaft Coupler — Precision Motion Control for CNC \u0026amp; 3D Printer Builds\u003c\/h2\u003e\n    \u003cp\u003eShaft misalignment is one of the most common causes of premature bearing wear, vibration noise, and lost positional accuracy in CNC routers, 3D printers, and servo-driven automation systems. Engineers, makers, and machine builders who demand tight tolerances need a coupler that compensates for angular, parallel, and axial misalignment without sacrificing torque transmission. This flexible plum coupling — also called a jaw spider shaft coupler — is engineered for exactly that job.\u003c\/p\u003e\n    \u003cp\u003eEach coupler consists of two aluminum alloy hubs and a polyurethane spider insert (plum-shaped elastomer). The hubs are precision-bored to accept shaft diameters ranging from 5 mm to 28 mm (approx. 0.20\"–1.10\"), with outer diameters spanning 20 mm to 55 mm (approx. 0.79\"–2.17\") and body lengths from 25 mm to 80 mm (approx. 0.98\"–3.15\"). Set screws lock each hub firmly onto the shaft. Variants with equal bore diameters (e.g., d6-6, d8-8) and reducing bore options (e.g., d15-18, d12-28) are available.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include stepper and servo motor coupling on CNC milling machines and laser engravers, lead-screw connections on Cartesian 3D printers such as Ender and Prusa-style frames, and flexible coupling for rotary encoders and pump drives where vibration damping is critical. Search terms like \"flexible jaw coupler for NEMA 23 motor,\" \"spider coupler CNC lead screw,\" and \"plum coupling 3D printer Z-axis\" describe exactly what this product solves.\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    Compatible with NEMA 17 \/ NEMA 23 stepper motors, servo motors, CNC routers, laser engravers, 3D printers (Cartesian \u0026amp; CoreXY), rotary encoders, and lead-screw assemblies. Verify shaft diameters before ordering.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These Flexible Plum Shaft 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 Aluminum Alloy Hubs\u003c\/strong\u003e\n      \u003cp\u003ePrecision-machined aluminum hubs deliver low rotational inertia and corrosion resistance, keeping your drivetrain responsive and rust-free over long service cycles.\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 plum insert absorbs shock loads and dampens vibration, protecting downstream components like encoders and ball screws from impact fatigue.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n      \u003cstrong\u003eWide Size Range — 20 mm to 55 mm OD\u003c\/strong\u003e\n      \u003cp\u003e27 variants cover outer diameters from D20 to D55 and bore diameters from 5 mm to 28 mm, making it straightforward to match your motor shaft and driven shaft in one order.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\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, reducing stress on motor bearings and extending machine life.\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\u003c\/strong\u003e\n      \u003cp\u003eEach hub is secured with grub set screws for tool-free shaft swaps during maintenance or machine reconfiguration — no press-fit required.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e🖨️\u003c\/div\u003e\n      \u003cstrong\u003eCNC \u0026amp; 3D Printer Ready\u003c\/strong\u003e\n      \u003cp\u003eSized and bored to match common NEMA 17 (5 mm shaft), NEMA 23 (6.35 mm shaft), and servo motor shaft standards used in hobbyist and professional CNC builds.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Flexible Jaw Spider Shaft 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\u003eFlexible Jaw (Plum \/ Spider) Shaft Coupler\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\u003eInsert Material\u003c\/th\u003e\n\u003ctd\u003ePolyurethane Elastomer (Spider \/ Plum)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (D)\u003c\/th\u003e\n\u003ctd\u003e20 mm – 55 mm (0.79\" – 2.17\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBody Length (L)\u003c\/th\u003e\n\u003ctd\u003e25 mm – 80 mm (0.98\" – 3.15\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter (d)\u003c\/th\u003e\n\u003ctd\u003e5 mm – 28 mm (0.20\" – 1.10\") — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Configuration\u003c\/th\u003e\n\u003ctd\u003eEqual bore \u0026amp; reducing bore variants available\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eClamping Method\u003c\/th\u003e\n\u003ctd\u003eSet Screw (Grub Screw)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural Aluminum (anodized or brushed) — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMisalignment Tolerance\u003c\/th\u003e\n\u003ctd\u003eAngular: typically ≤1°; Parallel: See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eCNC Router, 3D Printer, Servo \/ Stepper Motor, Lead Screw, Encoder\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece\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 bore diameter for my motor and lead screw?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCheck the shaft diameter of both your motor and the driven component (e.g., lead screw or encoder). Select a variant whose bore values match — for example, \"d6.35-6.35\" for a NEMA 23 motor paired with a 6.35 mm lead screw, or a reducing variant like \"d15-18\" when the two shafts differ in size. Measure with calipers before ordering to confirm.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between equal-bore and reducing-bore variants?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEqual-bore couplers (e.g., d8-8) have the same bore diameter on both hubs and are used when the motor shaft and driven shaft are the same size. Reducing-bore couplers (e.g., d12-28) have different bore diameters on each hub, allowing you to connect two shafts of different diameters without an adapter sleeve.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong is the polyurethane spider insert, and will it wear out quickly?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003ePolyurethane spider inserts are designed for continuous duty in light-to-medium torque applications typical of CNC and 3D printer drives. They resist oil, grease, and moderate heat. Under normal operating loads the insert outlasts many machine service intervals; however, if you notice increased backlash or cracking, the insert can be replaced independently without replacing the aluminum hubs.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this coupler suitable for outdoor or high-humidity environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe aluminum hubs offer good corrosion resistance in typical indoor workshop and light industrial environments. For prolonged outdoor or high-humidity exposure, applying a light coat of anti-corrosion spray to the hub exterior is recommended. The polyurethane insert itself is moisture-resistant and will not swell or degrade under normal humidity levels.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this coupler fit my NEMA 17 or NEMA 23 stepper motor?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNEMA 17 motors typically have a 5 mm output shaft — select a variant with d5 bore. NEMA 23 motors commonly use a 6.35 mm (1\/4\") shaft — choose a d6.35 variant. Always verify your specific motor's datasheet, as some NEMA 23 motors ship with 8 mm or 10 mm shafts depending on the manufacturer.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this coupler on a 3D printer Z-axis lead screw?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. This is one of the most common applications. The flexible spider insert compensates for the slight angular misalignment that often exists between a stepper motor shaft and a lead screw, reducing Z-axis wobble artifacts (\"Z-banding\") in prints. Match the bore to your motor shaft and lead screw diameter, and ensure the outer diameter fits within your printer's frame clearance.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I install and secure the coupler onto the shafts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSlide each hub onto its respective shaft, align the hubs so the spider insert seats evenly between the jaw fingers, then tighten the set screws with the appropriate hex key (typically 2–3 mm). Ensure the shaft end is flush with or slightly recessed from the inner face of the hub for maximum grip. Do not overtighten — snug and firm is sufficient to prevent slipping under normal torque loads.\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 Diameter * Length * Aperture 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 bore diameter for my motor and lead screw?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Check the shaft diameter of both your motor and the driven component. Select a variant whose bore values match — for example, d6.35-6.35 for a NEMA 23 motor paired with a 6.35 mm lead screw, or a reducing variant like d15-18 when the two shafts differ in size. Measure with calipers before ordering to confirm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between equal-bore and reducing-bore variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Equal-bore couplers have the same bore diameter on both hubs and are used when the motor shaft and driven shaft are the same size. Reducing-bore couplers have different bore diameters on each hub, allowing you to connect two shafts of different diameters without an adapter sleeve.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is the polyurethane spider insert, and will it wear out quickly?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Polyurethane spider inserts are designed for continuous duty in light-to-medium torque applications. They resist oil, grease, and moderate heat. The insert can be replaced independently without replacing the aluminum hubs if wear occurs.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this coupler suitable for outdoor or high-humidity environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The aluminum hubs offer good corrosion resistance in typical indoor workshop environments. For prolonged outdoor or high-humidity exposure, applying a light coat of anti-corrosion spray is recommended. The polyurethane insert is moisture-resistant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this coupler fit my NEMA 17 or NEMA 23 stepper motor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"NEMA 17 motors typically have a 5 mm output shaft — select a d5 bore variant. NEMA 23 motors commonly use a 6.35 mm shaft — choose a d6.35 variant. Always verify your specific motor's datasheet as shaft sizes can vary.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this coupler on a 3D printer Z-axis lead screw?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The flexible spider insert compensates for slight angular misalignment between a stepper motor shaft and a lead screw, reducing Z-axis wobble artifacts in prints. Match the bore to your motor shaft and lead screw diameter.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I install and secure the coupler onto the shafts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Slide each hub onto its respective shaft, align the hubs so the spider insert seats evenly between the jaw fingers, then tighten the set screws with the appropriate hex key (typically 2–3 mm). Ensure the shaft end is flush with or slightly recessed from the inner face of the hub.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"D20* L25* d5-5","offer_id":52421710184722,"sku":"LXDBJT02690x1","price":11.36,"currency_code":"USD","in_stock":true},{"title":"D20* L30* d6-6","offer_id":52421710217490,"sku":"LXDBJT02697x1","price":12.23,"currency_code":"USD","in_stock":true},{"title":"D20* L30* d6.35-6.35","offer_id":52421710250258,"sku":"LXDBJT02709x1","price":12.23,"currency_code":"USD","in_stock":true},{"title":"D25* L30* d6-6","offer_id":52421710283026,"sku":"LXDBJT02707x1","price":11.49,"currency_code":"USD","in_stock":true},{"title":"D25* L30* d6.35-6.35","offer_id":52421710315794,"sku":"LXDBJT02676x1","price":12.77,"currency_code":"USD","in_stock":true},{"title":"D30* L35* d6.35-6.35","offer_id":52421710348562,"sku":"LXDBJT02673x1","price":15.9,"currency_code":"USD","in_stock":true},{"title":"D30* L35* d8-8","offer_id":52421710381330,"sku":"LXDBJT02675x1","price":16.03,"currency_code":"USD","in_stock":true},{"title":"D30* L40* d8-8","offer_id":52421710414098,"sku":"LXDBJT02678x1","price":16.58,"currency_code":"USD","in_stock":true},{"title":"D30* L40* d12-12","offer_id":52421710446866,"sku":"LXDBJT02677x1","price":16.71,"currency_code":"USD","in_stock":true},{"title":"D30* L55* d6-6","offer_id":52421710479634,"sku":"LXDBJT02687x1","price":13.26,"currency_code":"USD","in_stock":true},{"title":"D40* L50* d15-18","offer_id":52421710512402,"sku":"LXDBJT02689x1","price":17.61,"currency_code":"USD","in_stock":true},{"title":"D40* L55* d8-8","offer_id":52421710545170,"sku":"LXDBJT02694x1","price":18.62,"currency_code":"USD","in_stock":true},{"title":"D40* L55* d10-10","offer_id":52421710577938,"sku":"LXDBJT02700x1","price":18.07,"currency_code":"USD","in_stock":true},{"title":"D40* L55* d12-12","offer_id":52421710610706,"sku":"LXDBJT02674x1","price":20.11,"currency_code":"USD","in_stock":true},{"title":"D40* L55* d14-14","offer_id":52421710643474,"sku":"LXDBJT02695x1","price":18.62,"currency_code":"USD","in_stock":true},{"title":"D40* L55* d17-17","offer_id":52421710676242,"sku":"LXDBJT02708x1","price":18.62,"currency_code":"USD","in_stock":true},{"title":"D40* L55* d18-18","offer_id":52421710709010,"sku":"LXDBJT02699x1","price":18.07,"currency_code":"USD","in_stock":true},{"title":"D40* L55* d19-19","offer_id":52421710741778,"sku":"LXDBJT02711x1","price":18.62,"currency_code":"USD","in_stock":true},{"title":"D40* L55* d20-20","offer_id":52421710774546,"sku":"LXDBJT02710x1","price":18.07,"currency_code":"USD","in_stock":true},{"title":"D40* L65* d14-14","offer_id":52421710807314,"sku":"LXDBJT02693x1","price":20.39,"currency_code":"USD","in_stock":true},{"title":"D40* L65* d15-15","offer_id":52421710840082,"sku":"LXDBJT02701x1","price":18.62,"currency_code":"USD","in_stock":true},{"title":"D40* L65* d16-16","offer_id":52421710872850,"sku":"LXDBJT02686x1","price":18.62,"currency_code":"USD","in_stock":true},{"title":"D40* L65* d19-19","offer_id":52421710905618,"sku":"LXDBJT02688x1","price":24.87,"currency_code":"USD","in_stock":true},{"title":"D40* L65* d20-20","offer_id":52421710938386,"sku":"LXDBJT02696x1","price":18.62,"currency_code":"USD","in_stock":true},{"title":"D40* L66* d16-16","offer_id":52421710971154,"sku":"LXDBJT02698x1","price":18.62,"currency_code":"USD","in_stock":true},{"title":"D40* L66* d17-17","offer_id":52421711003922,"sku":"LXDBJT02679x1","price":20.11,"currency_code":"USD","in_stock":true},{"title":"D55* L80* d12-28","offer_id":52421711036690,"sku":"LXDBJT02692x1","price":37.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture9of38_96be193c-ade3-442b-86f2-a810d04cd975.jpg?v=1783069271","url":"https:\/\/homediyer.com\/products\/flexible-plum-coupling-servo-motor-jaw-spider-shaft-coupler-cnc-3d-printer","provider":"HomeDIYer","version":"1.0","type":"link"}