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Parallax (Futaba S148) Continuous Rotation Servo
 
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The Parallax continuous rotation servo is a Futaba S148 servo that has been modified for continuous rotation. Since servos have their own integrated control circuitry, this unit gives you an easy way to get your robot moving.
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The Parallax (Futaba S148) continuous rotation servo converts standard RC servo position pulses into continuous rotation speed. It can be controlled directly by a microcontroller without any additional electronics, which makes it a great actuator for robotics projects. The servo includes an adjustable potentiometer that can be used to center the servo and comes with a star-shaped servo horn and an 11" (270 mm) lead.
Parallax continuous rotation servo specs
- Power: 4.8 – 6 V
- Top 4.8 V speed: 60 RPM (with no load)
- Torque: 2.4 kg-cm/33.3 oz-in at 4.8 V, 3.0 kg-cm/41.7 oz-in at 6 V
- Weight: 43 g/1.5 oz with servo horn and screw
- Size (L x W x H): 40.5 mm x 20.0 mm x 38.0 mm / 1.60" x 0.8" x 1.50"
- Control interface: RC servo pulse width control, 1.50 ms neutral
- Manual adjustment port
This servo is compatible with our servo controllers and our servo wheels and sprockets.
Servo Specification Comparison Table
| Item | Size mm |
Weight g/oz |
Lead length mm/in |
Hardware included? |
4.8 V | 6 V | ||
|---|---|---|---|---|---|---|---|---|
| Speed sec/60° |
Torque kg-cm/oz-in |
Speed sec/60° |
Torque kg-cm/oz-in |
Parallax Cont. Rotation | 40.5 x 20.0 x 38.0 | 43/1.5 | 270/11 | Yes | 0.28 | 2.4/33.3 | 0.22 | 3.0/41.7 |
| GWS PICO | 22.8 x 9.5 x 15.50 | 5.4/0.19 | 100/4 | Yes | 0.12 | 0.70/10 | 0.09 | 0.84/12 |
| GWS NARO+ F/HP/BB | 22.2 x 11.00 x 22.85 | 10/0.36 | 130/5 | Yes | 0.10 | 1.70/24 | not recommended | |
| GWS NARO PRO | 27.0 x 12.7 x 22.4 | 13/0.46 | 130/5 | Yes | 0.12 | 1.60/22 | not recommended | |
| GWS PARK L | 30.86 x 16.17 x 26.5 | 17/0.59 | 130/5 | Yes | 0.13 | 2.4/33 | 0.10 | 2.8/39 |
| GWS MINI | 35.0 x 16.9 x 32.0 | 24.3/0.86 | 120/4.5 | Yes | 0.19 | 3.40/47 | 0.15 | 4.20/58 |
| Joinmax Digital | 52.3 x 20.0 x 33.5 | 33/1.16 | 250/10 | Yes | not available | not available | 0.18 | 3.5/48.6 |
| GWS S03N | 39.5 x 20.0 x 39.6 | 41/1.44 | 270/11 | Yes | 0.23 | 3.40/47 | 0.18 | 4.00/56 |
| GWS S03N XF | 39.5 x 20.0 x 39.6 | 41/1.44 | 270/11 | Yes | 0.15 | 2.20/31 | 0.12 | 2.45/34 |
| GWS S03T | 39.5 x 20.0 x 39.6 | 46/1.62 | 270/11 | Yes | 0.33 | 7.20/100 | 0.27 | 8.00/111 |
| GWS S125 | 40.5 x 20 x 42 | 50/1.76 | 270/11 | Yes | 0.26 | 6.6/92 | 0.21 | 7.6/106 |
| GWS S04 BBM | 54.4 x 26.5 x 51.5 | 114/4.00 | 270/11 | Yes | 0.25 | 10.00/138.88 | 0.20 | 13.00/180.50 |
| GWS S666N 2BB MG | 63.0 x 32.0 x 61.6 | 160.4/5.66 | 270/11 | Yes | 0.24 | 24.00/333 | 0.20 | 28.80/400 |
| GWS S777 6BB | 65.0 x 32.0 x 70.4 | 190/6.70 | 270/11 | Yes | 0.15 | 35/486 | 0.12 | 42/583 |
