The 25T Red Aluminum RC Servo Horn Arm is an aluminium servo horn with 25 spline teeth, 28mm arm length, 5mm inner bore diameter, and 2mm thickness in red anodized finish, designed for Futaba-standard RC and robotics servos. This servo horn’s red anodized color serves a practical function beyond aesthetics in multi-servo robotics builds — using differently colored horns (such as this red variant alongside the blue version covered separately) on different servo functions allows instant visual identification of each servo’s role during assembly, wiring, and troubleshooting without needing to trace each servo cable back to its controller.
The aluminium servo horn’s 28mm arm length is 2mm shorter than the 30mm blue variant — this shorter lever distance reduces the output travel arc of a connected linkage for the same servo rotation angle, which can be useful when a smaller, more precise movement range is needed at the linkage endpoint rather than the maximum travel the 30mm arm provides. The 25t servo horn’s 5mm inner bore diameter confirms the shaft hole dimension, which is useful for verifying fit on specific servo output shafts or when using extension sleeves.
the shorter 28mm futaba servo horn arm produces less mechanical output travel than the 30mm version at the same servo rotation — builders needing maximum throw distance should use the longer arm, while those needing finer, more controlled travel should use this 28mm version. Available from StemVolt, offering quality robotics parts and DIY kits at competitive prices. This aluminum RC servo horn arm is ideal for DIY projects, robotics applications and STEM models.
Related Products:
- Checkout 0.3–4mm Drill Chuck
Features:
- Red anodized — color-coded for function ID in multi-servo builds
- 28mm arm — finer travel control than 30mm variant
- 5mm inner bore specified for precise shaft fit verification
- 25T Futaba-standard spline — widest RC servo compatibility
Technical Specifications:
Applications:
- Red Servo Horn used for multi-servo robot color-coded arm build
- Project uses aluminium servo horn for arm travel comparison
- Uses 25t servo horn for Futaba 28mm precision linkage
- For RC car futaba servo horn steering servo arm
Package Includes:
- 1 × Aluminum RC Servo Horn Arm FUTABA
Ryan D’Souza –
Shipped same day
Paramjeet Singh –
No complaints at all
Aditi Joshi –
Strong and precise servo linkage performance, making it ideal for ATL lab projects, robotics applications, RC vehicles, and engineering prototypes requiring accurate motion transfer
Venkatesh Iyer –
Impressed with quality
Prosenjit Das –
Easy checkout and customer care support ensured a smooth purchasing experience, while the well sealed box protected the product during transit
Ajit Shah –
Suitable for robotic arms, RC aircraft, steering mechanisms, automation systems, and STEM projects requiring a durable aluminum servo horn arm with reliable performance.