Overview
Two-Way Bus Communication
Complete Protection & Smart Power Limiting
Advanced Modes & Stop Behaviors
- Single-Turn: ±180° range for standard rotary joints
- Multi-Turn: ±368,640° (1,024turns) range, with multi-turn count saved after power-off
- Damping Mode: controlled resistance for smooth, compliant motion
- 3 Stop Modes: Free, Lock, and Damp for different holding/release needs
Rich Motion Commands & Profiles
Custom Home Position
Unified Ecosystem & Daisy-Chain Ready
Media Gallery
Specification
|
Item |
Basic Specifications |
|---|---|
|
Operating Voltage |
9.0 ~ 12.6 V |
|
Motor Type |
Cored Motor |
|
Position Sensor |
12-bit Non-contact Absolute Encoder (Magnetic) |
|
Resolution |
2048 steps / 360° (0.176°) |
|
Effective Angle |
±180° (single-turn) / ±368,640° (multi-turn) |
|
Processor |
32-bit MCU |
|
Communication Type |
UART / TTL half-duplex |
|
Baud Rate |
9,600 bps ~ 1 Mbps |
|
ID Range |
0 ~ 254 |
|
Gear Ratio |
378:1 |
|
Gear Material |
All-metal Copper-Aluminum Combination |
|
Output Shaft Spec |
Aluminum / Ø6 mm / 25T |
|
Housing Material |
Aluminum alloy middle section / upper & lower engineering plastic shells |
|
Interface Type |
PH2.0 - 3Pin |
|
Dimensions / Weight |
40 x 20 x 40 mm / 53 g |
|
Operating Temperature |
-10 ~ 60 °C |
|
Operating Modes |
Single-turn Angle | Multi-turn Angle | Damping Mode |
|
Item |
Characteristic Specifications |
|---|---|
|
Static Stall Torque |
3.43 N·m (35 kg·cm) |
|
Maximum Dynamic Torque |
1.27 N·m (13 kg·cm) |
|
Rated Torque |
0.54 N·m (5.5 kg·cm) |
|
No-load Speed |
34 rpm (0.298 s / 60°) |
|
Rated Speed |
16 rpm (0.625 s / 60°) |
|
Peak Current |
3 A |
|
No-load Current |
<200 mA |
|
Standby Current |
<30 mA |
|
Axial |
20 N |
|
Radial |
40 N |
Performance Curves
SDK And Platforms
CAD Drawings
Documents
Certification
|
HS Code |
8501109990 |
|
ECCN Code |
EAR99 |
|
Country of Origin |
China |
|
Certifications |
CE, FCC, RoHS |
Part List
|
Item |
Qty. |
|---|---|
|
Servo |
1 |
|
8-Hole Main Horn |
1 |
|
8-Hole Assistant Horn |
1 |
|
PM M3*6mm Screw |
1 |
|
PM M2*4.5mm Screw |
16 |
|
PB M2*4.5mm Screw |
10 |
|
200mm 3-pin Cable (PH2.0×2) |
1 |
| Protocol Type | UART |
|---|---|
| Input Voltage | 9.0 ~ 12.6 V |
| Motor Type | Cored Motor |
| Position Sensor | 12-bit Non-contact Absolute Encoder (Magnetic) |
| Effective Position Range | ±180° (single-turn) / ±368,640° (multi-turn) |
| Resolution | 2048 steps / 360° (0.176°) |
| Processor | 32-bit MCU |
| Baud Rate | 9,600 bps ~ 1 Mbps |
| ID Range | 0 ~ 254 |
| Reduction Ratio | 378:1 |
| Output Spline Specification | Copper / Ø6 mm / 25T |
| Gear Material | All-metal Copper-Aluminum Combination |
| Interface | PH2.0 – 3Pin |
| Case Material | Aluminum alloy middle section / upper & lower engineering plastic shells |
| Dimensions | 40 x 20 x 40 mm |
| Appearance | Dual-shaft |
| Weight | 53 g |
| Operating Temperature | -10 ~ 60 °C |
| Operating Mode | Single-turn Angle | Multi-turn Angle | Damping Mode |
| Max Stall Torque | 3.43 N·m (35 kg·cm) |
| Max Continuous Torque | 1.27 N·m (13 kg·cm) |
| Rated Torque | 0.54 N·m (5.5 kg·cm) |
| Rated Speed | 16 rpm (0.625 s / 60°) |
| No Load Speed | 34 rpm (0.298 s / 60°) |
| Peak Current | 3 A |
| Axial Load | 20N |
| Radial Load | 40N |
Frequently Asked Questions About RA8-U35H-M UART Servo
These FAQs explain how the RA8-U35H-M fits robotics, automation, education, and engineering projects, with details on protocol, power, torque, speed, documentation, and integration resources.
What makes the RA8-U35H-M a good UART servo for robotics?
The RA8-U35H-M combines UART control, cored motor, 12-bit non-contact absolute encoder (magnetic), and a 3.43 N·m (35 kg·cm) maximum stall torque in a servo package built for strong robotic joints, grippers, gimbals, and education or research platforms needing higher holding force where microcontroller-friendly serial control and SDK integration are important. This gives engineers a clearer match between communication method, torque class, and mechanical load than choosing a generic hobby servo.
When should I choose the RA8-U35H-M UART bus servo instead of a PWM servo?
Choose the RA8-U35H-M when your project needs serial bus control, ID-based multi-servo addressing, 0 ~ 254, feedback-oriented motion control, and SDK-driven integration. A PWM servo is simpler, but this UART robotic servo is better suited to coordinated robot arms, humanoid joints, and programmable motion platforms.
What power supply should be used with the RA8-U35H-M?
Use a stable external power supply within the 9.0 ~ 12.6 V operating range. Because the RA8-U35H-M can reach 3.43 N·m (35 kg·cm) stall torque, the power system should provide enough current for startup, acceleration, and loaded motion; avoid powering the servo directly from a microcontroller board.
How does the RA8-U35H-M balance torque, speed, and size?
This model is specified with 3.43 N·m (35 kg·cm) stall torque, 1.27 N·m (13 kg·cm) max continuous torque, and 0.54 N·m (5.5 kg·cm) rated torque. Its no-load speed is 34 rpm (0.298 s / 60°), with rated speed of 16 rpm (0.625 s / 60°), and the weight is 53 g. These figures make it better suited for compact motion axes rather than one-size-fits-all servo selection.
Can the RA8-U35H-M be used in multi-servo robotic systems?
Yes. The RA8-U35H-M is intended for bus-style robotic systems, with an ID range of 0 ~ 254. For reliable multi-servo operation, assign unique servo IDs, follow the recommended wiring topology, and size the power supply for the combined current of all moving axes.
Where can I find documentation, drawings, and setup resources for the RA8-U35H-M?
Use the product page sections for Documents, CAD Drawings, and related resources. Fashion Star Wiki resources also cover servo selection, communication protocols, wiring and power-supply guidance, debugging tools, SDK packages, and model or drawing downloads for the servo series.
What position-control range does the RA8-U35H-M support?
The RA8-U35H-M supports ±180° (single-turn) / ±368,640° (multi-turn). This makes the servo useful for both conventional joint rotation and applications that need extended motion range, provided the mechanical design and software limits are configured correctly.
Engineering note: Always confirm power input, wiring, mechanical load, and software limits before testing the RA8-U35H-M in a finished robot or automation system.
Shipping & Delivery
We ship orders to customers worldwide. Most orders are dispatched via DHL Express to provide fast, reliable international delivery with end-to-end tracking.
Processing Time
In-stock items are usually processed within 1–3 business days after payment is confirmed.
Shipping Method
Our default international shipping method is DHL Express. Other trusted express or air services may be used when appropriate.
Estimated Delivery Time
DHL Express delivery typically takes 3–7 business days after dispatch for most international destinations.
Shipping Cost
Shipping costs are calculated based on the destination, package weight, dimensions, and selected shipping method. The final shipping cost will be shown at checkout before payment.
For large-volume or special shipments, please contact us for a shipping quotation.
Customs Duties & Import Taxes
International orders may be subject to customs duties, import taxes, VAT/GST, brokerage fees, or other charges required by the destination country/region.
These charges are not included in the product price or shipping cost unless specifically stated. Customers are responsible for any applicable import duties, taxes, and customs-related fees. Please check with your local customs office before placing an order.
Order Tracking
Once your order has been shipped, we will provide a tracking number by email or through your account order details. Tracking information may take up to 24 hours to update after the shipment is collected by the carrier.
Delays & Special Situations
Delivery may be delayed due to public holidays, customs inspections, weather conditions, carrier disruptions, force majeure events, or other circumstances beyond our control.
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The RA8-U35H-M UART bus servo integrates a DC motor, gearbox, control driver, sensors and communication protocol in one compact unit, combining 3.43 N·m (35 kg·cm), 9.0 ~ 12.6 V, cored motor, 12-bit non-contact absolute encoder (magnetic) for high-precision, reliable motion control in robotic arms, education kits, automation projects and scientific research platforms.
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