{"product_id":"brass-rigid-motor-shaft-coupling-3-17-12mm-rc-boat-car-airplane","title":"Brass Rigid Motor Shaft Coupling 3.17–12mm for RC Boat Car","description":"\n\u003ch2\u003eBrass Rigid Motor Shaft Coupling – Precision Transmission Connector for RC Models\u003c\/h2\u003e\n\u003cp\u003eUpgrade your RC boat, car, or airplane with this heavy-duty \u003cstrong\u003ebrass rigid motor shaft coupling\u003c\/strong\u003e. Machined from a durable aluminium-copper alloy, this cylindrical sleeve adapter delivers a rock-solid connection between motor and drive shafts — perfect for hobbyists and builders who demand reliable torque transmission and zero shaft slippage.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Size Range:\u003c\/strong\u003e Available in 19 configurations from 3.17mm up to 12mm bore diameter — same-size and step-up combinations to suit virtually any RC drivetrain.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRigid Cylindrical Design:\u003c\/strong\u003e Outer diameter of 14mm, 16mm, or 20mm (depending on size) with a consistent 22mm length for a compact, low-profile footprint.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4 Tightening Set Screws:\u003c\/strong\u003e M4 (or M5 for larger sizes) set screws positioned at 90° intervals lock shafts firmly in place and resist loosening under vibration.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAluminium-Copper (Brass) Alloy:\u003c\/strong\u003e Offers an ideal balance of strength, corrosion resistance, and lightweight performance — weighing just 14–27 grams per coupling.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eComplete Kit Included:\u003c\/strong\u003e Each order includes one coupling, four set screws, and one matching hex wrench — ready to install straight out of the package.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Compatibility:\u003c\/strong\u003e Suitable for RC boats, RC cars, RC airplanes, and other motor-driven hobby or DIY projects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSize Guide – All Available Bore Combinations\u003c\/h3\u003e\n\u003ch4\u003e14mm OD × 22mm Length\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e3.17mm × 3.17mm\u003c\/li\u003e\n  \u003cli\u003e4mm × 4mm\u003c\/li\u003e\n  \u003cli\u003e4mm × 5mm\u003c\/li\u003e\n  \u003cli\u003e4mm × 6mm\u003c\/li\u003e\n  \u003cli\u003e5mm × 5mm\u003c\/li\u003e\n  \u003cli\u003e5mm × 6mm\u003c\/li\u003e\n  \u003cli\u003e5mm × 8mm\u003c\/li\u003e\n  \u003cli\u003e6mm × 6mm\u003c\/li\u003e\n  \u003cli\u003e6mm × 8mm\u003c\/li\u003e\n  \u003cli\u003e7mm × 7mm\u003c\/li\u003e\n  \u003cli\u003e7mm × 8mm\u003c\/li\u003e\n  \u003cli\u003e8mm × 8mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e16mm OD × 22mm Length\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e5mm × 10mm\u003c\/li\u003e\n  \u003cli\u003e6mm × 10mm\u003c\/li\u003e\n  \u003cli\u003e8mm × 10mm\u003c\/li\u003e\n  \u003cli\u003e10mm × 10mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e20mm OD × 22mm Length\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e8mm × 12mm\u003c\/li\u003e\n  \u003cli\u003e10mm × 12mm\u003c\/li\u003e\n  \u003cli\u003e12mm × 12mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAluminium-Copper (Brass) Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSet Screw Thread\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eM4 (14mm \u0026amp; 16mm OD models) \/ M5 (20mm OD models)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 14–27 grams\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOuter Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14mm \/ 16mm \/ 20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLength\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e22mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Brass Rigid Shaft Coupling\u003c\/li\u003e\n  \u003cli\u003e4 × M4 or M5 Set Screws\u003c\/li\u003e\n  \u003cli\u003e1 × Hex Wrench\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10-in-1-multi-functional-bone-wrench-hex-socket-spanner-portable-repair-hand-tool-for-bicycle-motorcycle-furniture-assembly\"\u003e10-in-1 Multi-Functional Bone Wrench Hex Socket Spanner – Portable Repair Hand Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/16-in-1-multi-function-bike-repair-tool-portable-folding-hex-wrench-set-for-bicycle-motorcycle-furniture-maintenance-hand-tools\"\u003e16-in-1 Multi-Function Bike Repair Tool – Portable Folding Hex Wrench Set\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/3-in-1-precision-eyeglass-screwdriver-keychain-portable-mini-screwdriver-for-glasses-watch-spectacles-repair-hand-tool\"\u003e3-in-1 Precision Screwdriver Keychain – Portable Mini Hand Tool\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What RC applications are these brass rigid shaft couplings compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: These brass rigid motor shaft couplings are designed for RC boats, RC cars, and RC airplanes, as well as other hobby or DIY motor-driven builds that require a secure shaft-to-shaft connection. Simply select the bore size combination that matches your motor and drive shaft diameters.\u003c\/p\u003e\n\u003ch4\u003eQ: How do I choose the correct coupling size?\u003c\/h4\u003e\n\u003cp\u003eA: Measure the outer diameter of both your motor shaft and your drive shaft in millimetres. Then select the bore combination that matches — for example, if your motor shaft is 5mm and your drive shaft is 8mm, choose the 5mm × 8mm coupling. Same-size bores (e.g. 6mm × 6mm) are ideal when both shafts share the same diameter.\u003c\/p\u003e\n\u003ch4\u003eQ: Are the set screws and hex wrench included in every order?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. Every order includes one brass rigid coupling, four M4 or M5 set screws (depending on the size selected), and one matching hex wrench, so you have everything needed to install it immediately.\u003c\/p\u003e\n\u003ch4\u003eQ: What material is the coupling made from?\u003c\/h4\u003e\n\u003cp\u003eA: The coupling is machined from an aluminium-copper (brass) alloy, providing a strong yet lightweight construction that resists corrosion and handles the vibration demands of RC model applications.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What RC applications are these brass rigid shaft couplings compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"These brass rigid motor shaft couplings are designed for RC boats, RC cars, and RC airplanes, as well as other hobby or DIY motor-driven builds that require a secure shaft-to-shaft connection. 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