{"product_id":"flexible-shaft-coupler-4-35mm-rigid-coupling-cnc-3d-printer-stepper","title":"4mm - 35mm Flexible Coupling Shaft Coupler Motor Rigid CNC 3D Printer Stepper","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eFlexible Shaft Coupler 4–35mm — Rigid Torque Transmission for CNC \u0026amp; Motion Control\u003c\/h2\u003e\n\u003cp\u003eWhen misalignment, vibration, or shaft wobble disrupts your CNC router, 3D printer, or stepper motor drive system, the root cause is often a poorly fitted coupling. Engineers, makers, and machine builders who demand repeatable, zero-backlash motion need a shaft coupler that holds its grip under continuous load — not one that slips, cracks, or introduces runout into the drivetrain.\u003c\/p\u003e\n\u003cp\u003eThese flexible shaft couplers are machined from aluminum alloy with a helical-cut body that absorbs minor angular and parallel misalignment while maintaining rigid torque transfer. Available in coupler outer diameters from D20mm to D65mm and lengths from L25mm to L100mm, they accept shaft diameters ranging from 4mm to 35mm (approximately 0.16 in to 1.38 in). Each coupler is secured via dual set screws on each hub for a firm, slip-resistant grip on both shafts.\u003c\/p\u003e\n\u003cp\u003eTypical applications include lead screw connections on CNC milling machines and laser engravers, motor-to-shaft coupling on FDM and resin 3D printers, stepper motor drives in pick-and-place automation, and encoder shaft connections in servo systems. The wide size matrix — with same-diameter and cross-diameter shaft options — makes these couplers a go-to solution for flexible shaft coupler replacement, CNC stepper motor coupling, and 3D printer Z-axis coupler upgrades.\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, and NEMA 34 stepper motors; compatible with standard lead screws, ball screws, and encoder shafts. Verify shaft diameter and coupler bore before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Flexible Shaft Couplers\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eHelical-Cut Flexible Body\u003c\/strong\u003e\u003cbr\u003eThe spiral cut absorbs minor angular and parallel misalignment, reducing stress on motor bearings and lead screw nuts during operation.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eZero-Backlash Rigid Torque Transfer\u003c\/strong\u003e\u003cbr\u003eSolid aluminum construction ensures direct, play-free torque transmission — critical for accurate positioning in CNC and 3D printing applications.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eWide Size Matrix\u003c\/strong\u003e\u003cbr\u003eCoupler OD from D20mm to D65mm; shaft bore from 4mm to 35mm (≈0.16–1.38 in). Same-bore and cross-bore configurations available to match mixed-shaft setups.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔧\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eDual Set Screw Clamping\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003eTwo set screws per hub provide secure, tool-tightened clamping on each shaft end, preventing rotational slip under load.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🛡️\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e\u003cbr\u003eLightweight yet rigid aluminum alloy body resists corrosion and withstands the thermal cycling typical of enclosed CNC enclosures and heated 3D printer chambers.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eSold Individually or in Packs\u003c\/strong\u003e\u003cbr\u003eAvailable in 1 pc per order. Select your exact coupler dimension and shaft diameter combination from the variant options above.\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 Shaft Coupler\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAluminum Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupler Outer Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003eD20mm – D65mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupler Length\u003c\/th\u003e\n\u003ctd\u003eL25mm – L100mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Bore Diameter\u003c\/th\u003e\n\u003ctd\u003e4mm – 35mm (≈ 0.16 in – 1.38 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Configuration\u003c\/th\u003e\n\u003ctd\u003eSame-diameter and cross-diameter (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eClamping Method\u003c\/th\u003e\n\u003ctd\u003eDual set screws per hub\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupler Type\u003c\/th\u003e\n\u003ctd\u003eHelical-cut flexible rigid coupling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural aluminum (uncoated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 pc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Motor Types\u003c\/th\u003e\n\u003ctd\u003eNEMA 17, NEMA 23, NEMA 34 stepper motors; servo motors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eCNC routers, 3D printers, laser engravers, lead screw drives, encoder shafts\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 coupler dimension and shaft diameter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect the \u003cstrong\u003eCoupler Dimension\u003c\/strong\u003e (outer diameter × length) based on the physical space available in your machine. Then select the \u003cstrong\u003eShaft Diameter\u003c\/strong\u003e that matches the two shafts you are connecting — for example, \"6mm to 8mm\" means one hub accepts a 6mm shaft and the other accepts an 8mm shaft. If both shafts are the same size, choose a same-bore option such as \"8mm to 8mm\".\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a flexible coupler and a rigid coupler?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA \u003cstrong\u003erigid coupler\u003c\/strong\u003e transmits torque with no flex — ideal when shafts are perfectly aligned. A \u003cstrong\u003eflexible (helical) coupler\u003c\/strong\u003e has a spiral cut that allows it to absorb small amounts of angular and parallel misalignment without transmitting that stress to motor bearings or lead screw nuts. These couplers combine both: the helical cut provides flexibility while the aluminum body maintains near-zero backlash.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill this coupler fit my NEMA 17 stepper motor?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNEMA 17 stepper motors typically have a 5mm output shaft. Select a shaft diameter option that includes \"5mm\" on the motor side (e.g., \"5mm to 5mm\" or \"5mm to 8mm\" if your lead screw is 8mm). The D20mm × L25mm or D20mm × L30mm coupler dimensions are the most common fit for NEMA 17 applications.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the set screw clamping — will it slip under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEach hub uses two set screws tightened against the shaft. For best results, ensure the shaft has a flat (D-cut) or use thread-locking compound on the set screws. The aluminum alloy body provides sufficient grip for typical stepper motor torque outputs. For high-torque servo applications with shafts above 20mm, verify the coupler's rated torque against your motor's peak output.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\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 natural aluminum alloy finish offers moderate corrosion resistance suitable for indoor workshop and enclosed machine environments. For prolonged exposure to moisture, salt air, or chemical vapors, consider applying a thin coat of corrosion-inhibiting lubricant to the coupler surface. The set screws are steel and may show surface oxidation over time in high-humidity conditions.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this coupler to connect a motor shaft to a ball screw or lead screw?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These couplers are widely used to connect stepper or servo motor output shafts to ball screws and lead screws in CNC machines, 3D printers, and linear actuators. Select the shaft diameter option that matches your motor shaft on one side and your screw shaft diameter on the other. Confirm the coupler OD fits within your motor mount or bearing block clearance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat if my shaft diameter is not listed — can I use a slightly larger bore?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNo. The bore must match the shaft diameter precisely. Using an oversized bore will result in runout, vibration, and potential shaft damage even when set screws are tightened. If your shaft size is not listed, contact us to confirm availability of additional bore sizes not shown in the current variant matrix.\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 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 shaft diameter?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Select the Coupler Dimension (outer diameter x length) based on the physical space available in your machine. Then select the Shaft Diameter that matches the two shafts you are connecting. If both shafts are the same size, choose a same-bore option such as 8mm to 8mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a flexible coupler and a rigid coupler?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A rigid coupler transmits torque with no flex. A flexible (helical) coupler has a spiral cut that absorbs small angular and parallel misalignment without transmitting stress to motor bearings or lead screw nuts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this coupler fit my NEMA 17 stepper motor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"NEMA 17 stepper motors typically have a 5mm output shaft. Select a shaft diameter option that includes 5mm on the motor side. The D20mm x L25mm or D20mm x L30mm coupler dimensions are the most common fit for NEMA 17 applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is the set screw clamping — will it slip under load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Each hub uses two set screws tightened against the shaft. For best results, ensure the shaft has a flat (D-cut) or use thread-locking compound on the set screws.\"\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 natural aluminum alloy finish offers moderate corrosion resistance suitable for indoor workshop and enclosed machine environments. For prolonged exposure to moisture, consider applying a corrosion-inhibiting lubricant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this coupler to connect a motor shaft to a ball screw or lead screw?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These couplers are widely used to connect stepper or servo motor output shafts to ball screws and lead screws in CNC machines, 3D printers, and linear actuators.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What if my shaft diameter is not listed — can I use a slightly larger bore?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. The bore must match the shaft diameter precisely. Using an oversized bore will result in runout, vibration, and potential shaft damage even when set screws are tightened.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"D20mm x L25mm \/ 4mm to 4mm \/ 1 pcs","offer_id":52421961449746,"sku":"XFYXKJGK0250x1","price":6.73,"currency_code":"USD","in_stock":true},{"title":"D20mm x L25mm \/ 4mm to 5mm \/ 1 pcs","offer_id":52421961482514,"sku":"XFYXKJGK0251x1","price":6.73,"currency_code":"USD","in_stock":true},{"title":"D20mm x L25mm \/ 4mm to 6mm \/ 1 pcs","offer_id":52421961515282,"sku":"XFYXKJGK0252x1","price":6.73,"currency_code":"USD","in_stock":true},{"title":"D20mm x L25mm \/ 4mm to 6.35mm \/ 1 pcs","offer_id":52421961548050,"sku":"XFYXKJGK0253x1","price":6.73,"currency_code":"USD","in_stock":true},{"title":"D20mm x L25mm \/ 4mm to 7mm \/ 1 pcs","offer_id":52421961580818,"sku":"XFYXKJGK0254x1","price":6.73,"currency_code":"USD","in_stock":true},{"title":"D20mm x L25mm \/ 4mm to 8mm \/ 1 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