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KST X20-4208 Brushless Contactless 6BB HLS Standard Servo 46Kgf.cm 0.07sec
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KST X20-4208 Brushless Contactless 6BB HLS Standard Servo 46Kgf.cm 0.07sec
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
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
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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