RC Servo Horns are crucial mechanical linkages that transfer the rotational motion of a servo motor into linear movement for steering, throttle, or other functions in RC vehicles. They are typically found in 1/8 and 1/10 scale off-road crawlers, drift cars, and racing vehicles, providing precision and durability to the control system. Products were evaluated based on material composition, spline compatibility, mounting flexibility, user reviews, and feature analysis.
2Pack ShareGoo Metal 25T Servo Horn 25 Teeth Steering Arm Compatible with Futaba Savox Power HD Servos Motor Replacement for 1/8 1/10 RC Off-Road Crawler Drift Racing Car (Red)
This ShareGoo 2-pack offers a robust aluminum construction with versatile hole distances and broad compatibility, making it a reliable choice for various standard servo applications.
Search on Amazon5 Pack ShareGoo 25T Aluminum Servo Horns M3 Threads Metal Steering Arm for RC Car Truck Buggy Airplane-Black
The ShareGoo 5-pack provides excellent value with multiple horns, featuring an adjustable split-clamp design for secure fitment and hard aluminum construction.
Search on AmazonAxial Servo Horn Metal, 25T: SCX10 III, AXI231013
The Axial branded servo horn is designed for specific Axial SCX10 III models, suggesting optimized fitment and performance for dedicated enthusiasts of the brand.
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- 25T spline & M3 threads. Compatible with Futaba HSP Power HD Axial Savox Xcore MG995 Mostly standard servo motors; Fit for 1/8 1/10 rc off-road crawler drift racing car.
- Made of aluminum alloy,CNC machined for its precision,durable in use..
- Distance from hole center to hole center:16mm, 20mm;Thread: M3
- Easy and convenient to install and remove.
- Pack of 2Pcs 25-Teeth Servo Horn with clamping.Color: Red/Black(Optional)
- Distance from hole center to hole center:15mm, 20mm, 25mm, 30mm; Size: 37mm (Total length); Thread: M2.5; Package Quantity: 5pcs
- The servo horn is made of aluminum alloy, CNC machining makes it precise in size and stable in performance.
- A great replacement part for your rc model cars.
- Compatible with Futaba Savox Power Servos and so on.
- Fits for 1/8 1/10 RC car truck and other RC models boat FPV.
- Product name: 25T aluminum servo horn M3 threads metal steering arm.
- Dimension: 35x15x6mm (Hole centers at 20 and 24mm from the servo output.); Package quantity: 5pcs
- Adjustable type servo arm, includes two steel bolts to secure the split-clamp onto the servo output.
- For Vehicle Type: for Buggy, Car, Truck, Truggy; Hard aluminum construction for precision and durability. Better than most of the plastic material.
- Fits mostly standard servo motors. Compatible with Futaba Savox Xcore HSP HD Power TowerPro MG servo mostly 25T Standard Servo Motor.
- The 25T spline & M3 thread design is compatible with most standard servo motors, making it an ideal accessory for DIY RC models.
- Small size, light weight, easy installation and disassembly
- Hard aluminum structure, CNC machining, anodic oxidation treatment, durable use.
- Dimension: 35x15x7.5mm (Hole centers at 20 and 24mm from the servo output.)
- Package contents 5 x 25T servo arms, 5 x fastening screw bolts, 1 x L-shaped hex wrench key. Improve your user experience
- Multiple position holes design, adjust the position of links as your needs( Distance from hole center to hole center 16mm, 18mm.)
- This servo saver can improve steering accuracy while provide servo gear protection.(With screws, self-locking design to prevent loosening during use)
- Made of high quality 6061 aluminum alloy, which is sturdy and durable. Included 2pcs servo saver(25T).
- This servo saver is suit for RC car servo, RC boat servo(25T), compatible with mostly standard servo motors.
- Available 25 spline counts to fit most servos as Futaba, Power HD,Axial,Savox ,Xcore, TowerPro MG JX DS3218MG etc.
- Fit for most 1/10 1/8 RC Crawler Car
- Size: 46x16x9mm; 5 hole spacings for adjustability 12mm, 18mm, 23mm, 29mm and 34mm
- High quality CNC machined aluminum
- Clamping style head for secure mounting in high stress applications
- Package includes 2PCS 25T servo arm.CNC machining makes it precise in size and stable in performance.
- Compatible with mostly standard servo motors,for example, compatible with Futaba HSP Power HD Axial Savox Xcore MG995 MG996R MG946R and So on.Compatible with Traxxas Axial Tamiya HPI HSP Wltoys Axial SCX01 rc car truck.
- Distance from hole center to hole center：12mm, 16mm, 20mm
- Size:28x10x7.5mm
- Weight:1.7g/PCS
- 25T Spline & M3 threads Compatible with Mostly Standard Servo Motors
- Aluminum CNC machined for precision,anodized finish
- Includes two steel bolts to secure the split-clamp onto the servo output
- Dimension:35x15x6mm (Hole centers at 20 and 24mm from the servo output.)
- Pack of 5 Horns & 1 L Hex wrench key
- Product name: 25T aluminum servo horn M3 threads metal steering arm.
- Dimension: 35x15x6mm (Hole centers at 20 and 24mm from the servo output.); Package quantity: 5pcs
- Adjustable type servo arm, includes two steel bolts to secure the split-clamp onto the servo output.
- For Vehicle Type: for Buggy, Car, Truck, Truggy; Hard aluminum construction for precision and durability. Better than most of the plastic material.
- Fits mostly standard servo motors. Compatible with Futaba Savox Xcore HSP HD Power TowerPro MG servo mostly 25T Standard Servo Motor.
- Distance from hole center to hole center:15mm, 20mm, 25mm, 30mm; Size: 37mm (Total length); Thread: M2.5; Package Quantity: 5pcs
- The servo horn is made of aluminum alloy, CNC machining makes it precise in size and stable in performance.
- A great replacement part for your rc model cars.
- Compatible with Futaba Savox Power Servos and so on.
- Fits for 1/8 1/10 RC car truck and other RC models boat FPV.
This article is part of our complete guide Automotive — browse all our comparisons and buying guides.
Last update on 2026-07-18 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best RC Servo Horns
Material and Durability
The choice of material significantly impacts a servo horn's longevity and performance under stress. Most high-performance RC servo horns, such as those from ShareGoo and ZHUOYUEFSC, are CNC machined from aluminum alloy. This hard aluminum construction provides superior precision and durability compared to standard plastic alternatives, which can flex or strip under heavy loads or impacts. In practice, aluminum horns maintain their shape and integrity, ensuring consistent steering response and reducing the frequency of replacements, especially in demanding applications like off-road crawling or racing where forces on the steering mechanism are considerable.
Spline Count and Servo Compatibility
Compatibility with your servo motor's output shaft is paramount, primarily determined by the spline count. The industry standard for many popular servos, including Futaba, Savox, Power HD, Axial, and TowerPro, is a 25T (25-tooth) spline. All the products compared, including offerings from ShareGoo and Axial, feature this 25T spline, ensuring broad compatibility with a vast range of standard-sized servo motors. Always confirm your servo's spline count before purchase to avoid fitment issues; an incorrect spline count will prevent proper installation and function.
Mounting Options and Adjustability
Different servo horns offer varying mounting hole distances and adjustment mechanisms, which can affect steering geometry and overall setup. Many ShareGoo horns, such as the B09MF4XDFD and B0CP63ZQ9J models, feature multiple hole-to-hole distances, typically 16mm and 20mm, allowing for fine-tuning of steering throw and leverage. Some designs, like the ShareGoo 5-pack (B07DRNSYLG), incorporate an adjustable split-clamp type, which includes steel bolts to secure the horn tightly onto the servo output shaft, minimizing play and enhancing responsiveness. This adjustability is particularly beneficial for achieving optimal steering angles and preventing slippage under high torque conditions.
Thread Size and Fastener Security
The thread size for securing linkages is another critical detail. Across the board, M3 threads are the standard for attaching steering rods and other components to the servo horn. Products from ShareGoo and ZHUOYUEFSC consistently utilize M3 threads, ensuring compatibility with commonly available hardware. Using the correct M3 fasteners is vital for maintaining a secure connection, preventing loosening during aggressive driving, and providing reliable control over your RC vehicle. Incorrect thread usage can strip the horn or the fastener, compromising the entire steering assembly.
Pros & Cons
2Pack ShareGoo Metal 25T Servo Horn 25 Teeth Steering Arm Compatible with Futaba Savox Power HD Servos Motor Replacement for 1/8 1/10 RC Off-Road Crawler Drift Racing Car (Red)
Pros
- Constructed from durable CNC machined aluminum alloy for long-term use.
- Features common 25T spline and M3 threads, ensuring wide compatibility with standard servos.
- Offers two distinct hole-to-hole distances (16mm, 20mm) for tuning leverage.
Cons
- Only a 2-pack, which might be insufficient for users needing multiple replacements or builds.
- Lacks a split-clamp design for potentially more secure mounting than a single bolt.
5 Pack ShareGoo 25T Aluminum Servo Horns M3 Threads Metal Steering Arm for RC Car Truck Buggy Airplane-Black
Pros
- Supplied as a 5-pack, providing excellent value and spares for multiple applications.
- Incorporates an adjustable split-clamp design with steel bolts for enhanced security on the servo shaft.
- Made from hard aluminum, contributing to precision and overall durability.
Cons
- Specific hole distances are not detailed, potentially limiting fine-tuning options.
- The black color option may not suit all aesthetic preferences compared to other colored alternatives.
Axial Servo Horn Metal, 25T: SCX10 III, AXI231013
Pros
- Official Axial branded product, ensuring precise fit and compatibility for Axial SCX10 III vehicles.
- Metal construction implies enhanced durability over stock plastic components.
- Designed to integrate seamlessly within specific Axial chassis for optimal performance.
Cons
- Minimal product description limits understanding of specific features like hole distances or material grade.
- Likely optimized for Axial vehicles, potentially offering less universal application than other horns.
Common Mistakes to Avoid
Overlooking Spline Count Compatibility
A frequent error RC enthusiasts make is purchasing a servo horn without verifying the servo's spline count. While many standard servos, including Futaba, Savox, and Power HD, utilize a 25T spline, variations exist. Attempting to force a 23T or 24T horn onto a 25T servo, or vice versa, will result in stripped splines on either the horn or the servo output shaft, compromising the entire steering assembly. Always confirm your servo's specifications to ensure a perfect match, as seen with the widely compatible 25T horns from ShareGoo and ZHUOYUEFSC.
Ignoring Thread Size for Linkage Attachment
Another common oversight involves the thread size for attaching steering linkages. Most servo horns, such as those listed from ShareGoo, specify M3 threads. Using fasteners with incorrect thread pitch or diameter can strip the threads on the horn, leading to loose linkages and unresponsive steering. Always use M3 bolts when connecting steering rods to M3-threaded servo horns to maintain a secure and reliable connection.
Neglecting Mounting Hole Distances
Users often overlook the importance of mounting hole distances (e.g., 16mm, 20mm) on a servo horn. These distances directly affect the steering throw and leverage ratio. Selecting a horn with inappropriate hole distances for your vehicle's setup can lead to either insufficient steering angle or excessive steering sensitivity. For instance, horns offering both 16mm and 20mm options, like some ShareGoo models, provide flexibility for tuning your RC car's steering geometry to achieve optimal performance for specific terrains or driving styles.