| 35KG·CM STALL | 0.070S/60° NO-LOAD | 8.4V RATED |
| 87G WEIGHT | StainlessGEARTRAIN | 360°TRAVELCustomizable |
Overview
The XQ-S8335DW is the sealed brushless one: 35 kg·cm at 8.4 V, 0.07 s/60°, 87 g, in a 21 × 40.5 × 37.6 mm CNC aluminium case rated IP67. The red anodised fins are the motor heat path, which is why this case is 1 mm wider and 4 mm shorter than the coreless 20 × 40 × 41 mm body.
Two things separate it from a coreless servo of the same torque. First, no brushes: nothing wears against a commutator, so service life is set by the bearings and the gears, not by brush length. Second, the IP67 seal — gasketed case joint, sealed output shaft and a potted lead exit — so mud, spray and a dunked river crossing are not an end-of-day failure.
The geartrain is stainless steel on two ball bearings with a 25T-φ5.94 spline, and the amplifier is digital with a 2 µs dead band. Speed at 8.4 V is 0.07 s/60°, which is fast enough for 1/8-scale buggy steering and for camera gimbals that need to correct quickly.
Performance at each supply voltage
| Supply | No-load speed | Peak stall torque | Idle current | Stall current |
|---|---|---|---|---|
| 6.0 V | 0.120 s/60° (500 °/s) | 24 kg·cm (2.35 N·m / 333 oz·in) | 300 mA | 2.8 A |
| 7.4 V | 0.090 s/60° (667 °/s) | 30 kg·cm (2.94 N·m / 417 oz·in) | 350 mA | 3.5 A |
| 8.4 V | 0.070 s/60° (857 °/s) | 35 kg·cm (3.43 N·m / 486 oz·in) | 410 mA | 4.0 A |
Control specification
| Item | Specification |
|---|---|
| Command signal | PWM |
| Amplifier | Digital controller |
| Pulse width range | 800–2200 µs |
| Neutral position | 1500 µs |
| Dead band | 2 µs |
| Rotating direction | CCW (1000–2000 µs) |
| Travel | 360°, customizable |
Mechanical specification
| Item | Specification | Item | Specification |
|---|---|---|---|
| Dimensions | 21 × 40.5 × 37.6 mm | Case material | Aluminium, CNC |
| Weight | 87 g | Geartrain | Stainless steel |
| Bearings | 2 × ball bearing | Motor | Brushless |
| Output spline | 25T-φ5.94 mm | Horn | Plastic, POM |
| Lead / connector | 300 mm | Mechanical limit | 210° |
| Operating temperature | −15 °C to 65 °C | Storage temperature | −20 °C to 70 °C |
| Ingress protection | IP67 | Travel | 360°, customizable |
What’s in the box
- 1 × XQ-S8335DW servo
- 1 × POM horn set
- 1 × mounting screw pack
Optional: metal horn, sold separately.
How to size it
Torque at the label is the 8.4 V number: 35 kg·cm. On 7.4 V it is 30 kg·cm, on 6.0 V it is 24 kg·cm. For a sealed servo in a wet application, size at 7.4 V if the pack sags — a 2S LiPo under load sits there for most of the run.
Stall current is 4.0 A at 8.4 V against 410 mA no-load. The IP67 seal adds a little drag at the shaft, so expect slightly higher idle current than an unsealed unit of the same size — nothing that changes the wiring, but it is why the no-load figure is 410 mA and not 300.
FAQ
Is IP67 really submersible?
IP67 means dust tight and protected against temporary immersion to 1 m for 30 minutes. It is not a dive rating. Fresh water, mud and spray are the intended use; salt water needs a rinse after the run and the shaft seal is a wear item.
Why brushless instead of coreless?
No brushes to wear, so the service interval is set by bearings and gears. It also runs cooler at the same output, which is what allows the case to be sealed without cooking the motor. The cost is a higher stall current at low voltage.
Will it fit where an S8050D fits?
Close, not identical. Mounting span is the same 54 mm, but the case is 21 × 40.5 × 37.6 mm against 20 × 40 × 41 mm — 1 mm wider and 3.4 mm shorter. Check the height under the brace before you swap.
What horn fits?
Standard 25T spline, φ5.94 mm centre. A POM horn set and screw pack ship in the box.
Other interfaces
Downloads
- XQ-S8335DW inspection specification (PDF, 818 KB)
Torque, speed and current at each supply voltage, mechanical data, control specification, mounting dimensions. - 2D dimension drawing (image)
Mounting hole positions, case depth and overall height; the same drawing is inside the datasheet.
