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RC servo arms are critical components that transmit the rotational force of your servo motor to control surfaces or other moving parts. The quality and material of these arms directly impact the precision, responsiveness, and durability of your RC model's steering and control systems. Selecting the appropriate servo arm ensures optimal performance and longevity for your vehicle.
Package includes: 6PCS Servo Horns+ 24PCS Screws (M3) （Screws colors sent by random）
Material: Aluminum alloy
Diameter: 20mm/0.79inch
Compatible with Hitec, Parallax, Futaba, TP Power etc. brand MG995 MG996 TR213 standard servos etc. also can fit for other brands standard servos (size 40x20x36mm).
Each disc has 4 fastening screws for fixing, multiple angle fixing, more robust than other servos.
The 25t servo horn long are compatible with Futaba Savox Power HD HSP MG995 MG996 Servos,suitable for 1/10 1/8 RC car truck and other RC models boat FPV.
Made of aluminum alloy,CNC machining makes it precise in size and stable in performance.
Total Length:37mm/1.46";Distance from Hole Center to Hole Center：15mm, 20mm, 25mm, 30mm
25 Thread Spline & M2.5 thread to adjustable.Easy and convenient to install.
Last update on 2026-09-01 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best RC Servo Arms
Material Matters
Plastic: Often found on budget-friendly models or as stock parts, plastic servo horns are lightweight and inexpensive. However, they can be prone to stripping or breaking under high stress or impacts.
Aluminum: A popular upgrade, aluminum servo arms offer significantly increased strength and rigidity. They are less likely to bend or strip, providing more precise control, especially in demanding applications.
Carbon Fiber: For ultimate strength-to-weight ratio, carbon fiber is the top choice. These arms are extremely stiff and lightweight, offering superior precision and durability, though they can be more expensive.
Size and Spline Count
The length of the servo arm influences the leverage and travel range of your control surfaces. Longer arms provide more travel but require more torque from the servo, while shorter arms offer less travel but are more direct.
Crucially, ensure the spline count (the number of teeth where the arm connects to the servo output shaft) matches your servo. Common counts include 23T (Futaba), 25T (Savox, Traxxas), and 24T (Hitec). Using the wrong spline count will prevent proper installation.
Type of Arm
Single Arm: A simple, direct arm often used for basic steering.
Dual Arm (or 'H' arm): Provides two points of attachment, often used for steering linkages on cars or for connecting to multiple points on aircraft control surfaces.
Disc/Plate Arm: A circular or plate-like arm with multiple mounting holes, offering flexibility in attachment points for various applications.
Frequently Asked Questions
What is the difference between a 23T and 25T servo arm?
The 'T' refers to the number of teeth on the spline that engages with the servo's output shaft. A 23T servo arm is designed for servos with 23 teeth, commonly used by brands like Futaba. A 25T servo arm fits servos with 25 teeth, often found on brands like Savox and Traxxas.
How do I know what size servo arm I need?
The size, or length, of the servo arm affects the amount of throw or travel your control surface can achieve. Longer arms provide greater throw but require more servo torque, while shorter arms offer less throw and a more direct response.
Can I use a plastic servo arm on a high-performance RC car?
While plastic servo arms are functional, they may not be ideal for high-performance or demanding applications. They are more susceptible to bending or stripping under stress, which can lead to loss of steering control. Upgrading to aluminum or carbon fiber is often recommended for improved durability and precision.
What does 'spline count' mean for servo arms?
Spline count refers to the number of teeth on the servo horn's output shaft interface. This must match the servo's output shaft to ensure a secure and accurate connection. Using an incorrect spline count will prevent the arm from fitting onto the servo.
Are carbon fiber servo arms worth the extra cost?
Carbon fiber servo arms offer excellent strength and rigidity while being very lightweight. If you prioritize the highest level of precision, responsiveness, and durability, especially in competitive RC applications, they can be a worthwhile investment.
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