The KST X20-4208 Brushless Contactless 6BB HLS Standard Servo is a high-torque, high-speed X20 series servo for 1:7 and 1:8 RC race cars, aerobatic airplanes, jets, and scale models. KST positions it for demanding on-road and off-road steering applications. Verified KST data lists a DC 6.0V-8.4V voltage range, up to 46Kgf.cm torque at 8.4V, and 0.07sec/60deg speed at 8.4V. It uses a 4-pole brushless DC motor, hardened steel/HLS gears, contactless position sensing, and 6 ball bearings. The 40 x 20 x 40mm case, IP65 splash-proof rating, and 25T 6mm output spline make X20-4208 a premium X20 option where both torque and fast response are required. Product Images Features 46Kgf.cm peak torque - Listed torque reaches 46Kgf.cm at 8.4V. 0.07sec high-speed response - Listed speed reaches 0.07sec/60deg at 8.4V. 4-pole brushless DC motor - Supports fast response and high efficiency. Contactless position sensing - Reduces mechanical wear in the feedback system. 6BB construction - Uses six ball bearings for high-load output support. Hardened steel/HLS gear set - Listed gear material supports heavy-duty use. IP65 splash-proof rating - Suitable for compatible RC environments with splash exposure. 25T 6mm output spline - Uses the listed standard output spline. Programmable setup - KST lists soft start and programmable support. 200deg default travel - Default travel is listed as +/-100deg. Specifications Parameter Value Model KST X20-4208 Shopify SKU KST-X20-4208 Rated Voltage DC 7.4V Voltage Range DC 6.0V-8.4V Torque 38Kgf.cm @ 6.0V; 42Kgf.cm @ 7.4V; 46Kgf.cm @ 8.4V Speed 0.10sec/60deg @ 6.0V; 0.08sec/60deg @ 7.4V; 0.07sec/60deg @ 8.4V Stalling Current 8.80A @ 6.0V; 10.8A @ 7.4V; 12.3A @ 8.4V Working Frequency 1520us / 333Hz Default Travel Angle +/-100deg = 200deg total Command Interface PWM command; pulse length 500us-2500us Output Shaft Spline 25T, 6mm Case Material Aluminum alloy Motor Type 4-pole brushless DC motor Gear Set Material Hardened steel / HLS Position Sensor Contactless Ball Bearing 6BB Waterproof Rating IP65 Case Dimensions 40 x 20 x 40mm +/-0.2mm Weight 80g +/-10% Temperature Range -20C to +65C Soft Start Yes Programmable Yes Reference Documents KST X20-4208 Technical Specification Application 1:7 and 1:8 RC race cars - Designed for high-load on-road and off-road steering applications. Buggy and truggy steering - Suitable when high torque and fast response are required. Aerobatic airplanes and jets - KST also positions it for high-performance aircraft use. Scale models - Works in compatible models after checking servo bay, spline, and load. HV steering upgrades - Useful where 46Kgf.cm torque and 0.07sec response at 8.4V are needed. PWM mechanisms - Can drive compatible mechanisms using the listed PWM command range. Packing List Description Quantity KST X20-4208 brushless servo 1 Accessory pack 1 FAQ .faq-accordion details { border-bottom: 1px solid #e6eef8; padding: 14px 0; } .faq-accordion summary { list-style: none; cursor: pointer; font-size: 16px; font-weight: 700; color: #1f2933; position: relative; padding-right: 32px; } .faq-accordion summary::-webkit-details-marker { display: none; } .faq-accordion summary::after { content: "\203A"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%) rotate(90deg); color: #007fff; font-size: 28px; line-height: 1; transition: transform 0.2s ease; } .faq-accordion details[open] summary::after { transform: translateY(-50%) rotate(270deg); } .faq-accordion p { margin: 12px 0 0; color: #4b5563; line-height: 1.65; } How does X20-4208 compare with X20-3005? X20-4208 provides higher listed torque, contactless feedback, 6BB construction, and +/-100deg default travel. X20-3005 is a lighter standard servo focused on very fast track steering. Does OpenELAB list multiple Shopify variants for this product? No. The current Shopify product is a single variant with SKU KST-X20-4208. What is the maximum listed torque? The technical specification lists 46Kgf.cm at 8.4V. What is the fastest listed speed? The fastest listed speed is 0.07sec/60deg at 8.4V. Is it waterproof? The KST technical specification lists IP65, which should be treated as splash-proof protection rather than full submersion waterproofing. What is included in the package? The package listing confirms one X20-4208 brushless servo and one accessory pack. What spline does it use? The technical specification lists a 25T, 6mm output shaft spline. What should I check before installation? Confirm the 40 x 20 x 40mm case, 25T 6mm spline, HV power range, steering load, and servo-arm clearance.
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