{"product_id":"cnc-shaft-coupler-flexible-plum-spider-jaw-coupling-stepper-motor-bore-6-20-mm","title":"CNC Shaft Coupler Flexible Plum Spider Jaw Coupling Stepper Motor Bore 6 - 20 mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eCNC Shaft Coupler — Flexible Plum Spider Jaw Coupling for Stepper \u0026amp; Servo Motors\u003c\/h2\u003e\n    \u003cp\u003eWhen shaft misalignment, vibration, or backlash causes your CNC machine or stepper motor drive to lose precision, the weak link is almost always the rigid coupling. Engineers, machine builders, and DIY CNC enthusiasts who demand repeatable accuracy need a coupling that absorbs angular and parallel misalignment without transmitting shock loads to bearings or encoders.\u003c\/p\u003e\n    \u003cp\u003eThese flexible plum spider jaw shaft couplers consist of two aluminum alloy hubs and a polyurethane (PU) spider insert. Available outer diameter × length combinations of 25 × 30 mm (~0.98\" × 1.18\") and 40 × 55 mm (~1.57\" × 2.17\"), with bore sizes ranging from 6 mm to 20 mm (approximately 0.24\" to 0.79\"). Sold individually (1 PCS) or in value packs of 2 or 5 pieces.\u003c\/p\u003e\n    \u003cp\u003eIdeal for CNC router Z-axis lead screw connections, 3D printer stepper motor couplings, laser engraver drive shafts, and general-purpose flexible shaft coupling for stepper motor applications where vibration damping and zero-backlash torque transmission are critical.\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, and NEMA 34 stepper motors | Fits standard CNC lead screws, ball screws, and servo motor shafts with bore sizes 6 mm, 6.35 mm, 17 mm, 19 mm, and 20 mm.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Flexible Plum Spider Jaw Shaft Couplers\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-list\"\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🌀\u003c\/span\u003e\n        \u003cstrong\u003eSpider Insert Vibration Damping\u003c\/strong\u003e\n        \u003cp\u003eThe polyurethane (PU) spider element absorbs torsional shock and running vibration, protecting motor bearings and encoders from fatigue damage during continuous CNC operation.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eMisalignment Compensation\u003c\/strong\u003e\n        \u003cp\u003eAccommodates angular misalignment (typically up to 1°) and parallel offset between motor and lead screw shafts, reducing stress on motor shaft bearings and extending service life.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\n        \u003cstrong\u003eAluminum Alloy Hubs\u003c\/strong\u003e\n        \u003cp\u003eLightweight yet rigid aluminum alloy hub bodies deliver low rotational inertia for fast acceleration and deceleration cycles — essential for high-speed CNC and 3D printer stepper motor applications.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003eClamp-Style Secure Fixing\u003c\/strong\u003e\n        \u003cp\u003eSplit-clamp hub design grips the shaft firmly with set screws, eliminating slip under load and ensuring consistent torque transmission without shaft damage.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n        \u003cstrong\u003eMulti-Pack Value Options\u003c\/strong\u003e\n        \u003cp\u003eAvailable in 1, 2, or 5-piece quantities — stock up for multi-axis CNC builds or keep spares on hand for rapid maintenance without downtime.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eWide Bore Size Range\u003c\/strong\u003e\n        \u003cp\u003eBore options from 6 mm to 20 mm cover the most common stepper motor shaft diameters and lead screw end dimensions, making these couplers a versatile fit across CNC router, laser, and 3D printer platforms.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Flexible Plum Spider Jaw Shaft Coupler\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eFlexible Plum Spider Jaw 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\u003eSpider Insert Material\u003c\/th\u003e\n\u003ctd\u003ePolyurethane (PU)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter × Length\u003c\/th\u003e\n\u003ctd\u003e25 × 30 mm \/ 40 × 55 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Size\u003c\/th\u003e\n\u003ctd\u003e6 mm, 6.35 mm, 17 mm, 19 mm, 20 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFixing Method\u003c\/th\u003e\n\u003ctd\u003eClamp-style with set screws\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRated Torque\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMax Speed\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAngular Misalignment Tolerance\u003c\/th\u003e\n\u003ctd\u003eTypically up to 1°\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 Pack\u003c\/th\u003e\n\u003ctd\u003e1 PCS \/ 2 PCS \/ 5 PCS (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eCNC routers, 3D printers, laser engravers, stepper\/servo motor drives\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 size for my stepper motor?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the bore size to your motor shaft diameter and lead screw end diameter. Common NEMA 17 motors use a 5 mm shaft, but many CNC lead screws have 6 mm or 6.35 mm (1\/4\") ends. NEMA 23 motors typically use 6.35 mm or 8 mm shafts. Check both the motor shaft and the lead screw end before selecting your bore combination from the variant options above.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between the 25 × 30 mm and 40 × 55 mm sizes?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 25 × 30 mm coupler (OD × Length) is suited for smaller bore shafts (6–6.35 mm) and compact motor mounts such as NEMA 17 setups. The 40 × 55 mm coupler handles larger bore shafts (17–20 mm) and is designed for heavier-duty NEMA 23\/34 stepper or servo motor applications with higher torque requirements.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan this coupler handle angular and parallel misalignment?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The polyurethane spider insert allows the coupling to flex and accommodate angular misalignment (typically up to approximately 1°) and minor parallel offset between the motor shaft and lead screw. This flexibility reduces bearing load and extends the life of both the motor and the driven component. It is not designed for large misalignment — always align shafts as closely as possible during installation.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs the spider insert replaceable if it wears out?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The jaw coupling design allows the polyurethane spider element to be replaced independently of the aluminum hubs. If you notice increased vibration or backlash over time, inspect the spider insert first — replacing it restores coupling performance without replacing the entire assembly.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this coupler corrode in a workshop or outdoor environment?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe aluminum alloy hubs have natural corrosion resistance suitable for typical indoor workshop environments. For humid or mildly corrosive conditions, the anodized surface provides additional protection. The PU spider insert is resistant to oils and mild chemicals. For highly corrosive or submerged environments, contact us to confirm suitability.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhy should I buy a 2 or 5-pack instead of a single coupler?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMulti-axis CNC machines (X, Y, Z axes) each require a separate coupler. Purchasing a 2 or 5-pack reduces per-unit cost and ensures you have matched spares on hand for fast maintenance. For 3-axis CNC routers, the 5-pack is a practical all-in-one solution covering all axes plus two spares.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this compatible with ball screws as well as lead screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These flexible jaw couplers are compatible with both lead screws and ball screws, provided the screw end diameter matches the selected bore size. They are also suitable for connecting stepper or servo motor shafts to encoder shafts, pump shafts, and other rotating machinery within the rated torque range.\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 Outer Diameter × Length, Bore, and Amount 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 size for my stepper motor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the bore size to your motor shaft diameter and lead screw end diameter. Common NEMA 17 motors use a 5 mm shaft, but many CNC lead screws have 6 mm or 6.35 mm (1\/4 inch) ends. NEMA 23 motors typically use 6.35 mm or 8 mm shafts. Check both the motor shaft and the lead screw end before selecting your bore combination.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 25 x 30 mm and 40 x 55 mm sizes?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 25 x 30 mm coupler is suited for smaller bore shafts (6-6.35 mm) and compact NEMA 17 motor mounts. The 40 x 55 mm coupler handles larger bore shafts (17-20 mm) for heavier-duty NEMA 23\/34 stepper or servo motor applications with higher torque requirements.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can this coupler handle angular and parallel misalignment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The polyurethane spider insert accommodates angular misalignment (typically up to approximately 1 degree) and minor parallel offset. Always align shafts as closely as possible during installation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is the spider insert replaceable if it wears out?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The jaw coupling design allows the polyurethane spider element to be replaced independently of the aluminum hubs, restoring coupling performance without replacing the entire assembly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this coupler corrode in a workshop or outdoor environment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The aluminum alloy hubs have natural corrosion resistance for typical indoor workshop environments. The anodized surface provides additional protection in humid conditions. The PU spider insert is resistant to oils and mild chemicals.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why should I buy a 2 or 5-pack instead of a single coupler?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Multi-axis CNC machines each require a separate coupler. Purchasing a 2 or 5-pack reduces per-unit cost and ensures matched spares for fast maintenance. For 3-axis CNC routers, the 5-pack covers all axes plus two spares.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this compatible with ball screws as well as lead screws?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These flexible jaw couplers are compatible with both lead screws and ball screws, provided the screw end diameter matches the selected bore size. They are also suitable for stepper or servo motor shafts, encoder shafts, and other rotating machinery within the rated torque range.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"25 x 30 mm \/ 6 x 6 mm \/ 1 PCS","offer_id":52421906465042,"sku":"GYJLTBJT02707x1","price":17.67,"currency_code":"USD","in_stock":true},{"title":"25 x 30 mm \/ 6.35 x 6.35 mm \/ 1 PCS","offer_id":52421906497810,"sku":"GYJLTBJT02709x1","price":19.24,"currency_code":"USD","in_stock":true},{"title":"40 x 55 mm \/ 17 x 17 mm \/ 1 PCS","offer_id":52421906530578,"sku":"GYJLTBJT02708x1","price":28.68,"currency_code":"USD","in_stock":true},{"title":"40 x 55 mm \/ 19 x 19 mm \/ 1 PCS","offer_id":52421906563346,"sku":"GYJLTBJT02711x1","price":28.68,"currency_code":"USD","in_stock":true},{"title":"40 x 55 mm \/ 20 x 20 mm \/ 1 PCS","offer_id":52421906596114,"sku":"GYJLTBJT02710x1","price":28.0,"currency_code":"USD","in_stock":true},{"title":"25 x 30 mm \/ 6 x 6 mm \/ 2 PCS","offer_id":52421906628882,"sku":"GYJLTBJT02707x2","price":33.25,"currency_code":"USD","in_stock":true},{"title":"25 x 30 mm \/ 6.35 x 6.35 mm \/ 2 PCS","offer_id":52421906661650,"sku":"GYJLTBJT02709x2","price":36.43,"currency_code":"USD","in_stock":true},{"title":"40 x 55 mm \/ 17 x 17 mm \/ 2 PCS","offer_id":52421906694418,"sku":"GYJLTBJT02708x2","price":55.34,"currency_code":"USD","in_stock":true},{"title":"40 x 55 mm \/ 19 x 19 mm \/ 2 PCS","offer_id":52421906727186,"sku":"GYJLTBJT02711x2","price":55.34,"currency_code":"USD","in_stock":true},{"title":"40 x 55 mm \/ 20 x 20 mm \/ 2 PCS","offer_id":52421906759954,"sku":"GYJLTBJT02710x2","price":53.92,"currency_code":"USD","in_stock":true},{"title":"25 x 30 mm \/ 6 x 6 mm \/ 5 PCS","offer_id":52421906792722,"sku":"GYJLTBJT02707x5","price":79.95,"currency_code":"USD","in_stock":true},{"title":"25 x 30 mm \/ 6.35 x 6.35 mm \/ 5 PCS","offer_id":52421906825490,"sku":"GYJLTBJT02709x5","price":87.98,"currency_code":"USD","in_stock":true},{"title":"40 x 55 mm \/ 17 x 17 mm \/ 5 PCS","offer_id":52421906858258,"sku":"GYJLTBJT02708x5","price":145.32,"currency_code":"USD","in_stock":true},{"title":"40 x 55 mm \/ 19 x 19 mm \/ 5 PCS","offer_id":52421906891026,"sku":"GYJLTBJT02711x5","price":145.32,"currency_code":"USD","in_stock":true},{"title":"40 x 55 mm \/ 20 x 20 mm \/ 5 PCS","offer_id":52421906923794,"sku":"GYJLTBJT02710x5","price":141.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-04_e91d3867-8130-49ae-a50f-124f69d22f1d.jpg?v=1783348787","url":"https:\/\/homediyer.com\/products\/cnc-shaft-coupler-flexible-plum-spider-jaw-coupling-stepper-motor-bore-6-20-mm","provider":"HomeDIYer","version":"1.0","type":"link"}