| 48KG·CM STALL | 0.090S/60° NO-LOAD | 8.4V RATED |
| 69G WEIGHT | StainlessGEARTRAIN | 360°TRAVELCustomizable |
Overview
The BLS348 is the 48 kg·cm member of the low-profile brushless family: the same 41 × 20.5 × 28.5 mm case as the BLS325, 4 g heavier at 69 g, and nearly double the torque. Same mounting holes, same 25T spline, same 20.5 mm profile.
Going from 25 to 48 kg·cm in the same envelope is a gear-ratio and motor-wind change, and you pay for it in speed: 0.09 s/60° at 8.4 V against 0.07 s/60° on the 325. For 1/10-scale steering or a large control surface that is the right trade; for a fast cyclic load it may not be.
This page covers the PWM build: a standard 50–333 Hz pulse input, 1500 µs neutral and a 3–4 µs dead band. It is the version to pick when the servo hangs off a receiver or a flight controller and you want nothing between the two.
Performance at each supply voltage
| Supply | No-load speed | Peak stall torque | Idle current | Stall current |
|---|---|---|---|---|
| 6.0 V | 0.140 s/60° (429 °/s) | 30 kg·cm (2.94 N·m / 417 oz·in) | 190 mA | 3.5 A |
| 7.4 V | 0.110 s/60° (545 °/s) | 37 kg·cm (3.63 N·m / 514 oz·in) | 220 mA | 4 A |
| 8.4 V | 0.090 s/60° (667 °/s) | 48 kg·cm (4.71 N·m / 667 oz·in) | 250 mA | 5 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 | 41 × 20.5 × 28.5 mm | Case material | Aluminium, CNC |
| Weight | 69 g | Geartrain | Stainless steel |
| Bearings | 2 × ball bearing | Motor | Brushless |
| Output spline | 25T-φ5.96 mm | Horn | Plastic, POM |
| Lead / connector | 300 mm, 3-wire | Mechanical limit | No limit |
| Operating temperature | −15 °C to 65 °C | Storage temperature | −20 °C to 70 °C |
| Ingress protection | Splash resistant (customizable) | Travel | 360°, customizable |
What’s in the box
- 1 × XQ-BLS348 servo
- 1 × POM horn set
- 1 × mounting screw pack
Optional: metal horn, sold separately.
How to size it
48 kg·cm at 8.4 V is the headline; on 7.4 V it is 37 kg·cm and on 6.0 V it is 30 kg·cm. With 5 A stall current at the top rail, two of these on one BEC will pull 10 A at stall — size the BEC for the transient, not the average.
Because the case is the same as the 325’s, the mounting and the clearance are identical. If you are replacing a 325 with a 348 for more torque, nothing in the bracket changes; if you are replacing a 348 with a 325, you lose 23 kg·cm and gain 0.02 s/60°.
FAQ
What is the difference between the BLS325 and BLS348?
Torque and speed: 48 kg·cm at 0.09 s/60° against 25 kg·cm at 0.07 s/60°, same 41 × 20.5 × 28.5 mm case, 69 g against 65 g.
Is the case really the same?
Yes. The 348 shares the 41 × 20.5 × 28.5 mm housing and the 49 mm mounting span with the 325, so brackets and clearance are interchangeable.
What pulse range does it accept?
The inspection sheet specifies a 500–2500 µs window (800–2200 µs on the 9130/9150) with 1500 µs neutral, both customizable at order. Feeding it outside that window is out of spec.
Can I drive it from a normal receiver?
Signal-wise yes, but check the supply. This servo wants 8.4–16.8 V, not a 6 V receiver pack, so the power rail has to be separate from the receiver’s.
Other interfaces
Downloads
- XQ-BLS348 inspection specification (PDF, 419 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.
