{"product_id":"flexible-plum-spider-jaw-coupling-cnc-shaft-coupler-stepper-all-bore-sizes","title":"Flexible Plum Spider Jaw Coupling CNC Shaft Coupler Stepper All Bore Sizes","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eFlexible Plum Spider Jaw Coupling — Precision Shaft Connection for CNC \u0026amp; Stepper Motor Builds\u003c\/h2\u003e\n\u003cp\u003eWhen shaft misalignment causes vibration, noise, or premature wear in your CNC router, 3D printer, or stepper motor drive system, the coupling is often the first component to fail. Engineers, makers, and machine builders who demand reliable torque transmission without rigid stress concentration need a coupling that flexibly compensates for angular, parallel, and axial misalignment — that's exactly what this flexible plum spider jaw coupling is designed to do.\u003c\/p\u003e\n\u003cp\u003eEach coupler consists of two precision-machined aluminum alloy hubs and a polyurethane spider insert (plum-shaped elastomer). The hubs are available in outer diameters from 20mm to 40mm (~0.79\" to 1.57\") and lengths from 25mm to 55mm (~0.98\" to 2.17\"). Bore combinations span 4mm through 19mm (~0.16\" to 0.75\") on each side, with same-bore and mixed-bore configurations available to match your exact shaft pairing.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC axis drives requiring low-backlash shaft coupling, stepper motor to leadscrew connections in 3D printers and laser engravers, and servo motor coupling in light industrial automation where vibration damping is critical for positional 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, servo motors, DC motors, and leadscrews with shaft diameters from 4mm to 19mm. Compatible with NEMA 17, NEMA 23, and similar frame motors. Verify your shaft diameters before selecting a variant.\n\u003c\/div\u003e\n\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-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003eDual Aluminum Alloy Hubs\u003c\/strong\u003e\n\u003cp\u003eMachined aluminum hubs deliver a strong, lightweight grip on both shafts. Clamping screws secure each hub independently, allowing quick installation and removal without special tools.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🌀\u003c\/div\u003e\n\u003cstrong\u003ePolyurethane Spider Insert\u003c\/strong\u003e\n\u003cp\u003eThe elastomeric plum spider absorbs shock loads and dampens vibration between hubs, protecting motor bearings and reducing resonance in precision motion systems.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eWide Bore Size Range\u003c\/strong\u003e\n\u003cp\u003eAvailable in mixed and matched bore combinations from 4mm to 19mm per side, covering the most common stepper and servo motor shaft diameters in a single product line.\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 — reducing stress on motor shafts and bearings during operation.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🛡️\u003c\/div\u003e\n\u003cstrong\u003eCorrosion-Resistant Construction\u003c\/strong\u003e\n\u003cp\u003eAluminum hubs with natural or anodized finish resist oxidation in workshop and light industrial environments. The polyurethane spider is oil- and grease-resistant for long service life.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚡\u003c\/div\u003e\n\u003cstrong\u003eLow Backlash Design\u003c\/strong\u003e\n\u003cp\u003eThe jaw-and-spider engagement geometry minimizes rotational play, making these couplers suitable for CNC positioning axes and closed-loop stepper systems where accuracy matters.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Plum Spider Jaw Shaft Coupler\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupler Type\u003c\/th\u003e\n\u003ctd\u003eFlexible Jaw (Plum Spider \/ Oldham-style)\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\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003eD20mm – D40mm (0.79\" – 1.57\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupler Length\u003c\/th\u003e\n\u003ctd\u003eL25mm – L55mm (0.98\" – 2.17\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e4mm – 19mm per side (0.16\" – 0.75\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Configuration\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\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFastening Method\u003c\/th\u003e\n\u003ctd\u003eSet screw (clamping)\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\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\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right coupler dimension and bore size?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect the Coupler Dimension (OD × Length) based on the physical space available in your build — larger OD couplers handle higher torque. Then select the Shaft Diameter option that matches your motor shaft on one side and your leadscrew or driven shaft on the other. Both values must match your actual shaft diameters exactly for a secure fit.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan this coupler connect two shafts of different diameters?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Many variants in this listing are specifically designed for mixed-bore configurations — for example, 4mm to 10mm or 6mm to 8mm. Select the Shaft Diameter option that lists your two shaft sizes. If you need a combination not shown, contact us to confirm availability.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the connection — will the coupler slip under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe aluminum hubs use set screws to clamp firmly onto each shaft. For added security, ensure the set screw seats against a flat on the motor shaft if one is present. The polyurethane spider transmits torque through jaw engagement, not friction alone, so the connection remains positive under normal CNC and stepper motor loads.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this coupler corrosion-resistant for use in humid or outdoor environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe aluminum alloy hubs resist oxidation well in typical workshop and indoor industrial conditions. The polyurethane spider is resistant to oils and greases. For prolonged outdoor or high-humidity exposure, consider applying a light protective coating to the hubs. This coupler is not rated for submersion or highly corrosive chemical environments.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this compatible with NEMA 17 and NEMA 23 stepper motors?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. NEMA 17 motors typically have 5mm shafts and NEMA 23 motors commonly use 6.35mm or 8mm shafts — all of which are covered by available bore options in this listing. Select the Shaft Diameter variant that matches your motor's output shaft diameter on one side and your leadscrew or coupling target on the other.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a rigid coupling and this flexible jaw coupling?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA rigid coupling requires near-perfect shaft alignment and transmits all vibration and shock directly between components. This flexible jaw coupling uses a polyurethane spider insert to absorb misalignment (angular, parallel, and axial) and dampen vibration, protecting motor bearings and reducing noise — making it the preferred choice for most CNC and 3D printer builds.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I replace just the spider insert if it wears out?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe polyurethane spider insert is a separate component from the aluminum hubs. In many jaw coupling designs, the spider can be replaced independently without removing the hubs from the shafts. Contact us to confirm spider insert availability for your specific coupler size.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Coupler Dimension and 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 coupler dimension and bore size?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Select the Coupler Dimension (OD x Length) based on the physical space available in your build. Then select the Shaft Diameter option that matches your motor shaft on one side and your leadscrew or driven shaft on the other. Both values must match your actual shaft diameters exactly for a secure fit.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can this coupler connect two shafts of different diameters?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Many variants are designed for mixed-bore configurations such as 4mm to 10mm or 6mm to 8mm. Select the Shaft Diameter option that lists your two shaft sizes.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is the connection — will the coupler slip under load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The aluminum hubs use set screws to clamp firmly onto each shaft. The polyurethane spider transmits torque through jaw engagement, not friction alone, so the connection remains positive under normal CNC and stepper motor loads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this coupler corrosion-resistant for use in humid or outdoor environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The aluminum alloy hubs resist oxidation well in typical workshop and indoor industrial conditions. The polyurethane spider is resistant to oils and greases. For prolonged outdoor or high-humidity exposure, consider applying a light protective coating to the hubs.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this compatible with NEMA 17 and NEMA 23 stepper motors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. NEMA 17 motors typically have 5mm shafts and NEMA 23 motors commonly use 6.35mm or 8mm shafts — all covered by available bore options. Select the Shaft Diameter variant that matches your motor output shaft.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a rigid coupling and this flexible jaw coupling?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A rigid coupling requires near-perfect shaft alignment and transmits all vibration directly. This flexible jaw coupling uses a polyurethane spider insert to absorb misalignment and dampen vibration, protecting motor bearings and reducing noise.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I replace just the spider insert if it wears out?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The polyurethane spider insert is a separate component from the aluminum hubs and can typically be replaced independently without removing the hubs from the shafts. Contact us to confirm spider insert availability for your specific coupler size.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"D20mm x L25mm \/ 10mm to 10mm","offer_id":52421708841234,"sku":"GY$$$BJT01187x1","price":16.88,"currency_code":"USD","in_stock":true},{"title":"D20mm x L25mm \/ 4mm to 10mm","offer_id":52421708874002,"sku":"GY$$$BJT01193x1","price":16.88,"currency_code":"USD","in_stock":true},{"title":"D20mm x L25mm \/ 5mm to 5mm","offer_id":52421708906770,"sku":"GY$$$BJT01180x1","price":16.88,"currency_code":"USD","in_stock":true},{"title":"D20mm x L25mm \/ 5mm to 8mm","offer_id":52421708939538,"sku":"GY$$$BJT01192x1","price":16.88,"currency_code":"USD","in_stock":true},{"title":"D20mm x L25mm \/ 6mm to 35mm","offer_id":52421708972306,"sku":"GY$$$BJT01186x1","price":16.88,"currency_code":"USD","in_stock":true},{"title":"D20mm x L25mm \/ 6mm to 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