{"product_id":"flexible-jaw-shaft-coupler-stepper-motor-cnc-3d-printer","title":"Flexible Coupling Joint Rigid Jaw Shaft Coupler for Stepper Motor CNC 3D Printer","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eFlexible Jaw Shaft Coupler — Precision Motion Coupling for Stepper Motors, CNC \u0026amp; 3D Printers\u003c\/h2\u003e\n    \u003cp\u003eWhen a misaligned or loose shaft connection causes your stepper motor to skip steps, your CNC router to chatter, or your 3D printer Z-axis to wobble, the culprit is almost always a worn or ill-fitting coupler. Engineers, makers, and machine builders who demand repeatable positioning accuracy need a coupling joint that grips firmly, absorbs minor angular misalignment, and holds its bore diameter under load.\u003c\/p\u003e\n    \u003cp\u003eThese flexible jaw shaft couplers are machined from aluminum alloy with a spider (jaw) elastomer insert, available in bore-size combinations ranging from 2 mm to 6 mm (approximately 0.08 in to 0.24 in). The two-piece clamp-style hub design allows tool-free bore adjustment within the listed range, and the polyurethane spider dampens vibration between the driving and driven shafts.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include NEMA 17 and NEMA 23 stepper motor lead-screw connections on 3D printers, Z-axis and X-axis drive couplings on desktop CNC routers, servo motor-to-encoder shaft links in automation rigs, and flexible shaft connections on laser engravers and pick-and-place machines.\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, T8 \u0026amp; T5 lead screws, and standard CNC \/ 3D printer drive shafts. Select your bore size combination from the variant options above.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Flexible Jaw Shaft Couplers\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eClamp-Style Two-Piece Hub\u003c\/strong\u003e — Split-collar design with set screws locks onto the shaft without marring the surface, enabling quick installation and removal without disassembling the machine.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eMultiple Bore Size Combinations\u003c\/strong\u003e — Available in nine bore pairings from 2 mm \/ 4 mm up to 3.17 mm \/ 4.0 mm, covering the most common stepper motor and lead-screw shaft diameters used in CNC and 3D printing.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003ePolyurethane Spider Insert\u003c\/strong\u003e — The elastomer jaw absorbs torsional shock and dampens vibration between the two hubs, protecting motor bearings and reducing resonance noise during rapid direction changes.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eAluminum Alloy Hubs\u003c\/strong\u003e — Lightweight yet rigid machined aluminum construction keeps rotational inertia low while maintaining the structural integrity needed for continuous-duty motion applications.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eAccommodates Angular \u0026amp; Parallel Misalignment\u003c\/strong\u003e — The flexible jaw design tolerates minor shaft misalignment (typically up to 1°–2° angular, 0.2–0.5 mm parallel), reducing stress on motor shafts and linear guides.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eBidirectional \u0026amp; Zero-Backlash Design\u003c\/strong\u003e — Suitable for both clockwise and counterclockwise rotation; the snug spider-to-jaw fit minimizes backlash for accurate positioning in open-loop stepper systems.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Flexible 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 Jaw (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\u003eSpider \/ Insert Material\u003c\/th\u003e\n\u003ctd\u003ePolyurethane Elastomer\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Size Range\u003c\/th\u003e\n\u003ctd\u003e2 mm – 6 mm (0.08 in – 0.24 in); see variant options for specific pairings\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOverall Length\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 aluminum\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\u003eAngular Misalignment Tolerance\u003c\/th\u003e\n\u003ctd\u003eTypically 1°–2°\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eParallel Misalignment Tolerance\u003c\/th\u003e\n\u003ctd\u003eTypically 0.2–0.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRotation Direction\u003c\/th\u003e\n\u003ctd\u003eBidirectional (CW \/ CCW)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Pack\u003c\/th\u003e\n\u003ctd\u003e1 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Applications\u003c\/th\u003e\n\u003ctd\u003eStepper motors, CNC routers, 3D printers, laser engravers, automation rigs\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 combination?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the first bore diameter to your motor shaft and the second bore diameter to your lead screw or driven shaft. For example, if your NEMA 17 motor has a 5 mm shaft and your T8 lead screw has a 8 mm shaft, select the 5 mm \/ 8 mm variant. Check both shaft diameters with a caliper before ordering to ensure a snug fit.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan this coupler handle the torque output of a NEMA 23 stepper motor?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe aluminum hubs and polyurethane spider are designed for the torque range typical of NEMA 17 and NEMA 23 stepper motors used in desktop CNC and 3D printing applications. For high-torque servo motors or industrial drives, please contact us to confirm the rated torque for your specific variant before purchasing.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this coupler resistant to corrosion?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe hubs are machined from aluminum alloy with a natural anodized finish, which provides good resistance to oxidation and light moisture exposure. The polyurethane spider insert is oil- and grease-resistant. For environments with heavy moisture, chemicals, or salt spray, additional protective measures may be advisable.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this coupler introduce backlash into my CNC or 3D printer?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe jaw-style design uses a snug-fitting elastomer spider between the two hubs, which minimizes backlash under normal operating loads. For open-loop stepper systems where positional accuracy is critical, ensure the set screws are tightened firmly against the shaft flat (if present) to prevent rotational slip.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow much shaft misalignment can this coupler tolerate?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe flexible jaw design typically accommodates up to 1°–2° of angular misalignment and 0.2–0.5 mm of parallel (radial) offset between the two shafts. Exceeding these limits will accelerate spider wear and may transmit vibration to the motor bearings. 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\u003eCan I replace just the spider insert if it wears out?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — the polyurethane spider insert is a separate component that sits between the two aluminum hubs. If the spider shows signs of wear, cracking, or deformation, it can be replaced independently without replacing the entire coupler assembly. Contact us to confirm spider availability for your specific variant.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this coupler suitable for 3D printer Z-axis lead screw connections?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. This is one of the most common use cases. The flexible jaw design compensates for minor Z-axis motor-to-lead-screw misalignment that causes Z-wobble artifacts in prints. Select the bore size that matches your motor shaft (typically 5 mm for NEMA 17) and your lead screw diameter (typically 8 mm for T8 screws).\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 Bore Size 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 combination?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the first bore diameter to your motor shaft and the second bore diameter to your lead screw or driven shaft. Check both shaft diameters with a caliper before ordering to ensure a snug fit.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can this coupler handle the torque output of a NEMA 23 stepper motor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The aluminum hubs and polyurethane spider are designed for the torque range typical of NEMA 17 and NEMA 23 stepper motors used in desktop CNC and 3D printing applications. Contact us to confirm the rated torque for your specific variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this coupler resistant to corrosion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The hubs are machined from aluminum alloy with a natural anodized finish, providing good resistance to oxidation and light moisture exposure. The polyurethane spider insert is oil- and grease-resistant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this coupler introduce backlash into my CNC or 3D printer?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The jaw-style design uses a snug-fitting elastomer spider between the two hubs, which minimizes backlash under normal operating loads. Ensure set screws are tightened firmly against the shaft flat to prevent rotational slip.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How much shaft misalignment can this coupler tolerate?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The flexible jaw design typically accommodates up to 1°–2° of angular misalignment and 0.2–0.5 mm of parallel offset between the two shafts.\"\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\": \"Yes — the polyurethane spider insert is a separate component that can be replaced independently without replacing the entire coupler assembly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this coupler suitable for 3D printer Z-axis lead screw connections?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The flexible jaw design compensates for minor Z-axis motor-to-lead-screw misalignment that causes Z-wobble artifacts in prints. Select the bore size matching your motor shaft and lead screw diameter.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2 mm to 4 mm \/ 1 pcs","offer_id":52421908365586,"sku":"PENGPXWG04659x1","price":2.65,"currency_code":"USD","in_stock":true},{"title":"2 mm to 5 mm \/ 1 pcs","offer_id":52421908398354,"sku":"PENGPXWG04681x1","price":2.65,"currency_code":"USD","in_stock":true},{"title":"2 mm to 6 mm \/ 1 pcs","offer_id":52421908431122,"sku":"PENGPXWG04660x1","price":2.79,"currency_code":"USD","in_stock":true},{"title":"2.3 mm to 3 mm \/ 1 pcs","offer_id":52421908463890,"sku":"PENGPXWG04676x1","price":2.79,"currency_code":"USD","in_stock":true},{"title":"2.3 mm to 4 mm \/ 1 pcs","offer_id":52421908496658,"sku":"PENGPXWG04670x1","price":2.79,"currency_code":"USD","in_stock":true},{"title":"2.3 mm to 5 mm \/ 1 pcs","offer_id":52421908529426,"sku":"PENGPXWG04674x1","price":2.65,"currency_code":"USD","in_stock":true},{"title":"3 mm to 6 mm \/ 1 pcs","offer_id":52421908562194,"sku":"PENGPXWG04658x1","price":2.79,"currency_code":"USD","in_stock":true},{"title":"3.17 mm to 3.17 mm \/ 1 pcs","offer_id":52421908594962,"sku":"PENGPXWG04683x1","price":2.65,"currency_code":"USD","in_stock":true},{"title":"3.17 mm to 4.0 mm \/ 1 pcs","offer_id":52421908627730,"sku":"PENGPXWG04656x1","price":2.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture4of9_47d17721-33c8-4c22-8111-93a8b12af008.jpg?v=1783348856","url":"https:\/\/homediyer.com\/products\/flexible-jaw-shaft-coupler-stepper-motor-cnc-3d-printer","provider":"HomeDIYer","version":"1.0","type":"link"}