{"product_id":"brass-flexible-shaft-coupler-rigid-coupling-motor-connector-cnc-for-rc-car-boat","title":"Brass Flexible Shaft Coupler Rigid Coupling Motor Connector CNC for RC Car Boat","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eBrass Flexible Shaft Coupler — Rigid Coupling Motor Connector for RC \u0026amp; CNC Applications\u003c\/h2\u003e\n\u003cp\u003eWhen misaligned shafts cause vibration, noise, or premature motor wear, hobbyists and engineers alike need a coupling solution that holds tight under load. This brass flexible shaft coupler is designed for RC car builders, RC boat enthusiasts, and CNC machine operators who demand a secure, low-backlash connection between motor and drive shaft.\u003c\/p\u003e\n\u003cp\u003eEach coupler is machined from solid brass, offering a balance of machinability, corrosion resistance, and mechanical strength. The rigid coupling design features two bored ends joined by a flexible intermediate section, accommodating minor angular and parallel misalignment. Available shaft diameter combinations range from 2mm\/2mm up to 6mm\/6mm (approximately 0.079\" to 0.236\"), with both same-diameter and stepped configurations to suit mixed motor-shaft pairings.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include connecting a brushless motor to a drive shaft in an RC boat, linking a stepper motor output to a lead screw on a desktop CNC router, or replacing a worn coupling on a small RC car drivetrain. Long-tail applications such as \"2mm to 4mm shaft coupler for RC boat\" and \"CNC stepper motor flexible coupling\" are directly addressed by the variant range available.\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 standard round motor shafts from 2mm to 6mm (0.079\"–0.236\"). Suitable for brushed and brushless DC motors, stepper motors, and servo output shafts used in RC vehicles, CNC machines, and small robotics platforms. Verify your motor and driven shaft diameters before selecting a variant.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Brass Flexible 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\u003eSolid Brass Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from brass for reliable mechanical strength, natural corrosion resistance, and smooth bore finish that grips shaft surfaces securely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eWide Diameter Range\u003c\/strong\u003e\n\u003cp\u003eCovers shaft combinations from 2mm\/2mm through 6mm\/6mm, including stepped variants (e.g., 2mm\/4mm, 3mm\/5mm) for mixed motor-to-shaft pairings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n\u003cstrong\u003eFlexible Coupling Design\u003c\/strong\u003e\n\u003cp\u003eAccommodates minor angular and parallel shaft misalignment, reducing stress on motor bearings and extending drivetrain service life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n\u003cstrong\u003eLow Backlash Transmission\u003c\/strong\u003e\n\u003cp\u003eRigid bore ends deliver direct torque transfer with minimal rotational play — critical for CNC positioning accuracy and RC drivetrain responsiveness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\n\u003cstrong\u003eSet Screw Retention\u003c\/strong\u003e\n\u003cp\u003eEach bore end is secured with a set screw (typically M2–M3 depending on bore size) for tool-free shaft locking and quick field replacement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n\u003cstrong\u003eFlexible Pack Sizes\u003c\/strong\u003e\n\u003cp\u003eAvailable in 1, 2, 3, 5, 10, 25, and 50-piece quantities — order a single unit for a repair or stock up for a build batch at a lower per-unit cost.\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 — Brass Flexible Shaft Coupler\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Diameter (Input \/ Output)\u003c\/th\u003e\n\u003ctd\u003eSee variant options (2mm\/2mm to 6mm\/6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoupling Type\u003c\/th\u003e\n\u003ctd\u003eFlexible shaft coupler with rigid bore ends\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRetention Method\u003c\/th\u003e\n\u003ctd\u003eSet screw (M2–M3, size varies by bore diameter)\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\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Recommended RPM\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Torque\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural brass (uncoated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePackage Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 3 \/ 5 \/ 10 \/ 25 \/ 50 PCS (see 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 choose the right shaft diameter combination?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure both your motor output shaft and your driven shaft (e.g., lead screw or drive shaft) with a digital caliper. Select the variant that matches both diameters — for example, if your motor shaft is 3mm and your drive shaft is 5mm, choose the 3mm\/5mm variant. Same-diameter variants (e.g., 3mm\/3mm) are used when both shafts are identical in size.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs this coupler strong enough for RC boat or RC car use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass provides adequate mechanical strength for the torque levels typical of small brushed and brushless motors used in RC cars and boats. For high-torque or high-RPM applications, confirm the coupler's rated torque with us before ordering. The set screw retention keeps the coupler locked on the shaft during normal operation.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill this coupler rust or corrode in wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass has inherent corrosion resistance and performs well in moist or splash environments typical of RC boat use. It is not fully submersion-rated, but surface oxidation (patina) does not significantly affect mechanical performance. For fully submerged or saltwater applications, consider applying a light coat of corrosion-inhibiting grease to the set screw area.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs this compatible with stepper motors for CNC machines?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These couplers are widely used to connect NEMA 17 and NEMA 23 stepper motor shafts (typically 5mm or 6.35mm \/ 1\/4\") to lead screws or ball screws on desktop CNC routers and 3D printer Z-axis assemblies. Select the variant matching your motor shaft and lead screw diameter. Note: 3.17mm corresponds to 1\/8\" (imperial) shaft sizing.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat does \"flexible\" mean — will it flex under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe \"flexible\" designation refers to the coupler's ability to accommodate minor shaft misalignment (angular or parallel offset), not to elastic deformation under torque. The bore ends are rigid and transmit torque directly. A small amount of misalignment tolerance prevents binding and reduces bearing wear, but the coupler should not be used as a substitute for proper shaft alignment.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I install and secure the coupler on the shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSlide each bore end onto the corresponding shaft until the shaft is flush with or slightly past the set screw hole. Use an appropriate hex key (Allen wrench) to tighten the set screw firmly against the shaft flat or surface. For shafts without a flat, tighten the set screw against the round shaft surface and check periodically for slippage during initial use. Do not overtighten, as this may deform the brass bore.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhy are there so many quantity options — which should I choose?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSingle-piece (1 PCS) orders suit one-off repairs or prototype builds. Multi-pack options (2, 3, 5 PCS) are ideal for small batch builds or keeping a spare on hand. Larger packs (10, 25, 50 PCS) offer a lower per-unit cost for workshop stock, maker spaces, or small-scale production runs. The per-piece price decreases as quantity increases.\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 \u003cstrong\u003eShaft Diameter\u003c\/strong\u003e and \u003cstrong\u003ePackage Quantity\u003c\/strong\u003e 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 shaft diameter combination?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure both your motor output shaft and your driven shaft with a digital caliper. Select the variant that matches both diameters — for example, if your motor shaft is 3mm and your drive shaft is 5mm, choose the 3mm\/5mm variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this coupler strong enough for RC boat or RC car use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass provides adequate mechanical strength for the torque levels typical of small brushed and brushless motors used in RC cars and boats. The set screw retention keeps the coupler locked on the shaft during normal operation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this coupler rust or corrode in wet environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass has inherent corrosion resistance and performs well in moist or splash environments typical of RC boat use. Surface oxidation does not significantly affect mechanical performance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this compatible with stepper motors for CNC machines?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These couplers are widely used to connect NEMA 17 and NEMA 23 stepper motor shafts to lead screws or ball screws on desktop CNC routers. Note: 3.17mm corresponds to 1\/8\\\" (imperial) shaft sizing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does 'flexible' mean — will it flex under load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 'flexible' designation refers to the coupler's ability to accommodate minor shaft misalignment, not elastic deformation under torque. The bore ends are rigid and transmit torque directly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I install and secure the coupler on the shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Slide each bore end onto the corresponding shaft until flush with the set screw hole. Use a hex key to tighten the set screw firmly. Do not overtighten, as this may deform the brass bore.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why are there so many quantity options — which should I choose?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Single-piece orders suit one-off repairs. Multi-pack options are ideal for small batch builds. Larger packs (10, 25, 50 PCS) offer a lower per-unit cost for workshop stock or small-scale production runs.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2mm\/2mm \/ 1 PCS","offer_id":52421909709074,"sku":"SSZXYYXKJGK0126x1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"2mm\/3mm \/ 1 PCS","offer_id":52421909741842,"sku":"SSZXYYXKJGK0127x1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"2mm\/4mm \/ 1 PCS","offer_id":52421909774610,"sku":"SSZXYYXKJGK0128x1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"2mm\/5mm \/ 1 PCS","offer_id":52421909807378,"sku":"SSZXYYXKJGK0129x1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"2mm\/6mm \/ 1 PCS","offer_id":52421909840146,"sku":"SSZXYYXKJGK0130x1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"2.3mm\/2mm \/ 1 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