S3153-size Servo Case Set for Futaba FUAS4139  [FUAS4139]

Compact servo case for S3153 servos

The Futaba FUAS4139 servo case set provides a protective housing for S3153-size servos, making installation and maintenance neater and more secure. Supplied without retail packing, it is intended as a replacement or service part to hold the servo body inside hobby models.

Fitment focuses on servos with S3153 external dimensions and other units that share the same outer form factor. The case acts as a mechanical shell to keep alignment with mounting points and to hold the servo steady during setup and tuning. Internal electronics and servo units are not included.

Installation guidance: position the servo so the output spline and shaft remain unobstructed, check clearance for the horn and linkages, and reuse the model's existing screws and spacers when fastening to the chassis or frame. The case simplifies repeatable positioning when swapping servos for bench testing or field repairs.