{"product_id":"universal-flexible-shaft-coupling-coupler-motor-u-joint-connector-metal-rc-boat","title":"Universal Flexible Shaft Coupling Coupler Motor U Joint Connector Metal RC Boat","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eUniversal Flexible Shaft Coupling — Metal U-Joint Connector for RC Boats, Motors \u0026amp; Drives\u003c\/h2\u003e\n\u003cp\u003eWhen two rotating shafts can't be perfectly aligned — whether in an RC boat drivetrain, a small CNC motor mount, or a DIY automation rig — a rigid connector transmits vibration, accelerates wear, and eventually fails. These universal flexible shaft couplings are designed for hobbyists, makers, and light-industrial builders who need a compact, metal U-joint connector that bridges mismatched or offset shaft ends without sacrificing torque transmission.\u003c\/p\u003e\n\u003cp\u003eEach coupling is a metal universal joint (U-joint) style connector machined to accept two shaft diameters simultaneously, covering input-to-output combinations from 2 mm to 10 mm (~0.08 in to ~0.39 in). The all-metal construction provides rigidity under load while the universal joint geometry allows angular misalignment between the two connected shafts. Available in 23 size combinations and pack quantities of 1, 2, 5, 10, or 20 pieces per order.\u003c\/p\u003e\n\u003cp\u003eTypical applications include RC boat propeller shaft-to-motor connections where the motor and prop shaft are offset, stepper motor to lead screw adapters in 3D printers and CNC routers, small servo linkages in robotics and automation, and replacement U-joint connectors in hobby-grade power transmission systems. The wide size matrix — including same-diameter pairs like 4-4mm and 8-8mm, and cross-diameter pairs like 6-8mm and 8-10mm — makes these couplings a practical stock item for any workshop.\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 motor and driven shafts from 2 mm to 10 mm diameter. The size label format is Input Shaft Diameter – Output Shaft Diameter (e.g., \"6-8mm\" = 6 mm input, 8 mm output). Verify both shaft diameters before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These Universal Flexible Shaft Couplings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚙️\u003c\/div\u003e\n\u003cstrong\u003eAll-Metal U-Joint Construction\u003c\/strong\u003e\n\u003cp\u003eUniversal joint geometry allows angular misalignment between input and output shafts, absorbing minor offset without binding — essential for RC boat drivetrains and compact motor mounts.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eWide Size Matrix — 23 Combinations\u003c\/strong\u003e\n\u003cp\u003eCovers shaft diameters from 2 mm to 10 mm in both same-diameter and cross-diameter pairings, so you can match mismatched motor and driven shaft sizes in a single connector.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\n\u003cp\u003eOrder 1, 2, 5, 10, or 20 pieces per SKU — ideal for single repairs, spare-parts kits, or stocking a workshop with matched couplings across multiple builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🛳️\u003c\/div\u003e\n\u003cstrong\u003eRC Boat \u0026amp; Hobby Drive Ready\u003c\/strong\u003e\n\u003cp\u003eCompact form factor and metal construction make these couplings a direct fit for RC boat propeller shaft connections, where space is tight and the motor-to-prop alignment is rarely perfect.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003eCross-Diameter Shaft Adaptation\u003c\/strong\u003e\n\u003cp\u003ePairs like 3-5mm, 6-8mm, and 8-10mm let you connect a motor shaft and driven shaft of different diameters without a separate adapter — reducing part count and assembly complexity.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003eTorque Transmission with Angular Flex\u003c\/strong\u003e\n\u003cp\u003eThe U-joint design transmits rotational torque continuously while accommodating angular misalignment, reducing vibration transfer to bearings and frames in sensitive builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — Universal Flexible Shaft Couplings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eConstruction\u003c\/th\u003e\n\u003ctd\u003eAll-metal universal joint (U-joint)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Diameter Range\u003c\/th\u003e\n\u003ctd\u003e2 mm – 10 mm (0.08 in – 0.39 in) per end\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSize Combinations Available\u003c\/th\u003e\n\u003ctd\u003e23 input–output diameter pairings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSame-Diameter Options\u003c\/th\u003e\n\u003ctd\u003e2-2mm, 2.3-2.3mm, 3-3mm, 3.17-3.17mm, 4-4mm, 5-5mm, 6-6mm, 8-8mm, 10-10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCross-Diameter Options\u003c\/th\u003e\n\u003ctd\u003e2-2.3mm, 2.3-3mm, 2.3-4mm, 3-2mm, 3-3.17mm, 3-4mm, 3-5mm, 3.17-4mm, 4-5mm, 5-8mm, 6-4mm, 6-5mm, 6-8mm, 8-10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity Options\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 5 \/ 10 \/ 20 pcs\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\u003eTorque Capacity\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax RPM\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight (per piece)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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 read the size label — what does \"6-8mm\" mean?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe size label shows the input shaft diameter first and the output shaft diameter second, separated by a dash. So \"6-8mm\" means the coupling accepts a 6 mm shaft on one end and an 8 mm shaft on the other. If both your shafts are the same diameter, choose a same-diameter option like \"6-6mm\" or \"8-8mm\".\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a U-joint coupling and a flexible beam coupling?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA U-joint (universal joint) coupling uses a cross-shaped yoke mechanism to transmit torque through an angle, making it well-suited for applications where the two shafts are not collinear. A flexible beam coupling uses a helical-cut metal body that flexes to absorb misalignment. U-joints handle larger angular offsets and are commonly used in RC boat drivetrains and automotive-style power transmission, while beam couplings are more common in precision CNC and encoder applications.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these couplings strong enough for RC boat use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These all-metal U-joint couplings are designed for hobby-grade RC boat propeller shaft connections, where the motor and prop shaft are often offset and the coupling must transmit torque reliably at moderate RPM. For high-performance racing RC boats with very high RPM or shock loads, verify the specific torque and RPM rating of the size you select against your motor's output specifications.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill these couplings corrode if used in a wet environment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe couplings are all-metal construction. If used in a wet or marine environment (such as an RC boat), apply a light coat of waterproof grease or corrosion-inhibiting oil to the joint mechanism after installation and periodically during use. This will extend service life and maintain smooth articulation.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these to connect a stepper motor shaft to a lead screw?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, these U-joint couplings can connect a stepper motor shaft to a lead screw when there is angular or parallel misalignment between the two. Select the size that matches your motor shaft diameter on one end and your lead screw diameter on the other — for example, \"5-8mm\" for a 5 mm stepper shaft to an 8 mm lead screw. Note that for precision CNC applications requiring zero backlash, a rigid or zero-backlash coupling may be more appropriate.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I secure the coupling to the shaft — is there a set screw?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eU-joint couplings of this type typically use set screws (grub screws) to clamp onto each shaft end. Tighten the set screw against a flat on the shaft (if present) or directly onto the round shaft for a secure grip. If your shaft does not have a flat, consider filing a small flat to prevent the coupling from rotating under load. Refer to the coupling's bore and set screw size when selecting a compatible hex key.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDo the multi-pack options include the same size coupling?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. When you select a pack of 2, 5, 10, or 20 pcs, all pieces in the pack are identical — same input and output shaft diameter combination. Multi-packs are priced at a lower per-unit cost than single-piece orders, making them economical for workshop stock or multi-machine builds.\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 Size and Qty 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 read the size label — what does \\\"6-8mm\\\" mean?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The size label shows input shaft diameter first and output shaft diameter second. \\\"6-8mm\\\" means 6 mm on one end and 8 mm on the other. For same-diameter shafts, choose options like \\\"6-6mm\\\" or \\\"8-8mm\\\".\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a U-joint coupling and a flexible beam coupling?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A U-joint uses a cross-shaped yoke to transmit torque through an angle, handling larger angular offsets. A beam coupling uses a helical-cut body for precision applications. U-joints are common in RC boat drivetrains and automotive-style power transmission.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these couplings strong enough for RC boat use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These all-metal U-joint couplings are designed for hobby-grade RC boat propeller shaft connections. For high-performance racing RC boats, verify the torque and RPM rating against your motor's output specifications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these couplings corrode if used in a wet environment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Apply a light coat of waterproof grease or corrosion-inhibiting oil to the joint mechanism after installation and periodically during use to extend service life in wet or marine environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these to connect a stepper motor shaft to a lead screw?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Select the size matching your motor shaft on one end and lead screw on the other — e.g., \\\"5-8mm\\\" for a 5 mm stepper to an 8 mm lead screw. For zero-backlash CNC applications, a rigid coupling may be more appropriate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I secure the coupling to the shaft — is there a set screw?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"U-joint couplings of this type typically use set screws to clamp onto each shaft end. Tighten against a flat on the shaft if present. If no flat exists, consider filing one to prevent rotation under load.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do the multi-pack options include the same size coupling?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. All pieces in a 2, 5, 10, or 20 pcs pack are identical — same input and output shaft diameter combination. Multi-packs offer a lower per-unit cost than single-piece orders.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"6-8mm \/ 1 pcs","offer_id":52421847744786,"sku":"SSJWJSCS00202x1","price":5.09,"currency_code":"USD","in_stock":true},{"title":"3.17-4mm \/ 1 pcs","offer_id":52421847777554,"sku":"SSJWJSCS00203x1","price":3.73,"currency_code":"USD","in_stock":true},{"title":"6-6mm \/ 1 pcs","offer_id":52421847810322,"sku":"SSJWJSCS00204x1","price":5.09,"currency_code":"USD","in_stock":true},{"title":"2.3-2.3mm \/ 1 pcs","offer_id":52421847843090,"sku":"SSJWJSCS00205x1","price":3.33,"currency_code":"USD","in_stock":true},{"title":"2-2mm \/ 1 pcs","offer_id":52421847875858,"sku":"SSJWJSCS00206x1","price":3.33,"currency_code":"USD","in_stock":true},{"title":"4-5mm \/ 1 pcs","offer_id":52421847908626,"sku":"SSJWJSCS00207x1","price":4.07,"currency_code":"USD","in_stock":true},{"title":"4-4mm \/ 1 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