{"product_id":"x20-4208-brushless-contactless-6bb-hls-standard-servo-46kgf-cm-0-07sec-for-1-7-1-8-scale-on-road-or-off-road-rc-race-cars-aerobatic-airplanes-and-jets","title":"KST X20-4208 6BB Contactless Brushless Standard Servo 46Kgf.cm 0.07sec for 1\/8 RC Cars \u0026 Aircraft","description":"\u003cp\u003eEngineered as an engineering milestone in competition servo technology, the \u003cstrong\u003eKST X20-4208\u003c\/strong\u003e is the industry's first standard-size digital servo to combine an ultra-responsive \u003cstrong\u003e4-pole brushless DC motor\u003c\/strong\u003e, proprietary \u003cstrong\u003eHigh Life Span (HLS) hardened steel gears\u003c\/strong\u003e, and a revolutionary \u003cstrong\u003e6-ball-bearing (6BB) drive architecture\u003c\/strong\u003e. Delivering a massive \u003cstrong\u003e46 kgf.cm of stall torque\u003c\/strong\u003e, a blisteringly quick \u003cstrong\u003e0.07s\/60° transit speed\u003c\/strong\u003e at 8.4V, wear-free \u003cstrong\u003econtactless magnetic sensing\u003c\/strong\u003e, and \u003cstrong\u003eIP65 splash-proof sealing\u003c\/strong\u003e, the X20-4208 provides unbreakable steering authority and surgical centering accuracy for 1:7 and 1:8 scale competition buggies, truggies, on-road GT racers, giant-scale aerobatic planes, and turbine jets.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustry-First 6 Ball Bearing Architecture (6BB):\u003c\/strong\u003e Six precision ball bearings provide total radial and axial support across every gear shaft, eliminating geartrain flex, reducing rotational friction, and guaranteeing zero gear slop even under violent track impacts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Torque 4-Pole Brushless Motor:\u003c\/strong\u003e Advanced 4-pole stator design produces significantly higher electromagnetic torque density, instantaneous throttle-to-steering response, and superior thermal efficiency during grueling endurance mains.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWear-Free Contactless Magnetic Sensor:\u003c\/strong\u003e Hall-effect position sensor completely eliminates physical potentiometer wiper wear, resistive track degradation, and vibration noise — delivering permanent, millimeter-precise centering repeatability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProprietary HLS Hardened Steel Geartrain:\u003c\/strong\u003e High Life Span (HLS) alloy treatment withstands extreme shock loads, high-traction curb strikes, and harsh off-road landings without stripping teeth.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormidable 46 kgf.cm Torque \u0026amp; 0.07s Speed:\u003c\/strong\u003e Delivers unyielding holding force and instantaneous wheel positioning under extreme centrifugal cornering loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIP65 Splash-Proof Construction:\u003c\/strong\u003e Sealed CNC aluminum housing protects delicate internal electronics and geartrain from wet tracks, mud spray, and abrasive track dust.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpansive 200° Default Travel:\u003c\/strong\u003e Wide ±100° (200° total) factory travel angle provides exceptional throw for crawlers, large control surfaces, and robotic actuators (endpoints programmable).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProgrammable \u0026amp; Soft Start:\u003c\/strong\u003e Customize travel endpoints, direction, and soft-start ramp protection via KST USB Link\/programming box to protect linkages on power-up.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003e*Note: Never connect or disconnect the servo to\/from a live, powered electrical system.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e X20-4208 Heavy-Duty Brushless Servo\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e 1:7 \u0026amp; 1:8 Scale On-Road \/ Off-Road RC Cars (Buggy, Truggy), Aerobatic Airplanes, Turbine Jets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated Voltage:\u003c\/strong\u003e DC 7.4V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage Range:\u003c\/strong\u003e DC 6.0V – 8.4V (2S LiPo Direct Drive)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Type:\u003c\/strong\u003e 4-Pole Brushless DC Motor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGear Set Material:\u003c\/strong\u003e Hardened Steel \/ HLS (High Life Span)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCase Material:\u003c\/strong\u003e CNC Aluminum Alloy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearings:\u003c\/strong\u003e 6 Ball Bearings (6BB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition Sensor:\u003c\/strong\u003e Contactless Magnetic (Hall Effect) Sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater Resistance:\u003c\/strong\u003e IP65 Splash-Proof\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorking Frequency:\u003c\/strong\u003e 1520μs \/ 333Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDefault Travel Angle:\u003c\/strong\u003e ±100° (200° Total, Programmable)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -20°C to +65°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoft Start \/ Programmability:\u003c\/strong\u003e Yes (Programmable)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 40.0 × 20.0 × 40.0 mm (±0.2mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 80g (±10%)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003ePerformance Ratings\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStall Torque:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003e38 kgf.cm @ 6.0V\u003c\/li\u003e\n\u003cli\u003e42 kgf.cm @ 7.4V\u003c\/li\u003e\n\u003cli\u003e46 kgf.cm @ 8.4V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Speed (No-Load):\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003e0.10 sec\/60° @ 6.0V\u003c\/li\u003e\n\u003cli\u003e0.08 sec\/60° @ 7.4V\u003c\/li\u003e\n\u003cli\u003e0.07 sec\/60° @ 8.4V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStall Current:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003e8.80A @ 6.0V\u003c\/li\u003e\n\u003cli\u003e10.80A @ 7.4V\u003c\/li\u003e\n\u003cli\u003e12.30A @ 8.4V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eDimensions \u0026amp; Sizing\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0846\/8280\/1402\/files\/X20-4208-02.png?v=1789640900\" alt=\"KST X20-4208 Servo Dimensions Diagram 1\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0846\/8280\/1402\/files\/X20-4208-01.png?v=1789640901\" alt=\"KST X20-4208 Servo Dimensions Diagram 2\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDocumentation\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0846\/8280\/1402\/files\/X20-4208_Technical_Specifcation.pdf?v=1789640901\" rel=\"noopener noreferrer\" target=\"_blank\" title=\"X20-4208 Technical Specification\"\u003eX20-4208 Technical Specification \u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KST","offers":[{"title":"Default Title","offer_id":50447648522490,"sku":null,"price":158.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0846\/8280\/1402\/files\/KST00953.png?v=1789014806","url":"https:\/\/kstdigital.com\/products\/x20-4208-brushless-contactless-6bb-hls-standard-servo-46kgf-cm-0-07sec-for-1-7-1-8-scale-on-road-or-off-road-rc-race-cars-aerobatic-airplanes-and-jets","provider":"KSTDigital","version":"1.0","type":"link"}