Futaba FUAS4139 - Servo Mount Case Compatible with S3153-size Servos  [FUAS4139]

Service housing details

The Futaba FUAS4139 case is built to accept S3153-size servos and to serve as a service or replacement part for hobby models. It is supplied without retail packing and is intended to secure the servo body during installation and servicing.

Compatibility targets servos with the S3153 external form factor and other units that match those outer dimensions. The case provides a stable mechanical enclosure to maintain mounting alignment and to prevent unwanted movement while tuning or adjusting the system. Note that no servo electronics are supplied with the case.

For installation, ensure the servo is seated so the output spline and shaft have clearance, confirm room for horns and linkages, and fit using the model's existing mounting screws and spacers. The case helps preserve consistent positioning when swapping servos during service or track-side checks.