This is the Futaba S3154 Digital High Torque, High Speed Micro Servo. The S3154 servo is ideal for electric planes and small electric helis.
One S3154 Digital Micro Servo
One .91" x .64" (23mm x 16mm) 4 arm servo horn (comes pre-installed)
One 1.33" x 1.33" (34mm x 34mm) 4 arm servo horn
Mounting hardware for your model
21 oz-in (1.5kg/cm) @ 4.8V
24 oz-in (1.7kg/cm) @ 6V
0.10 sec/60° @ 4.8V
.09 sec/60° @ 6V
Dimensions: .09 x 0.4 x 0.8in (22 x 11 x 20mm)
Weight: 0.28oz (7.9g)
Lead Length: 6.5" (170mm)
Output Shaft Diameter: 4mm
Comments: Do not use S3154 servos with gas or high power engine models, large gliders, or other models that require high torque. Using supply voltage higher than 6V or applying high load to the servo will shorten the life. Alway use the servo horn specially designed for this servo. Do not use conventional servo horns. Excessive force or shock to the servo horn may damage the ultra mini precision gears inside the servo.