Fastrax Heavy Duty Servo Arm 25 Tooth Black Aluminium Savox Futaba FAST311B

Overview

Upgrade your RC car's steering and throttle control with the Fastrax Heavy Duty Servo Arm 25T Single, a premium black anodised aluminium servo horn designed for serious RC enthusiasts across the UK. Whether you're running a Traxxas TRX-4 crawler, a high-performance truggy, or any RC vehicle fitted with Savox or Futaba servo specifications, this machined aluminium component delivers the durability and precision you need for reliable operation in demanding conditions. Unlike standard plastic servo arms that can flex or strip under load, this heavy-duty design combines engineering excellence with real-world performance that RC hobbyists trust.

The Fastrax Heavy Duty Servo Arm represents a significant upgrade for anyone serious about RC car performance and longevity. Whether you're bashing at weekends, competing in local races, or tackling technical terrain, this servo arm ensures your steering and throttle inputs translate directly to your vehicle without compromising response or reliability. The black anodised finish looks professional on any RC car build, while the engineering inside delivers measurable benefits that experienced RC drivers immediately appreciate. For UK-based RC enthusiasts looking to future-proof their vehicles against servo arm failure, this Fastrax component is a proven choice that delivers exceptional value for money.

Available in multiple spline sizes to suit various servo types, the Fastrax range of servo arms offers compatibility with the most popular RC vehicles in circulation today, from scale crawlers to high-speed buggies and truggies. This 25-tooth variant fits both Savox and Futaba servos, making it one of the most versatile options for builders working with premium servo equipment. The machined aluminium construction provides superior rigidity compared to plastic alternatives, reducing flex during aggressive cornering or rapid throttle applications that characterise modern RC racing and bashing.

Key Features

• Black Anodised Machined Aluminium Construction — The servo arm is precision-machined from solid aluminium and anodised in hard black finish, which not only looks professional but provides corrosion resistance and durability that plastic arms cannot match, ensuring your servo arm performs reliably season after season in all UK weather conditions.
• Heavy-Duty Design for Maximum Strength — Purpose-engineered for high-load applications, this servo arm resists flexing and deformation under the intense stresses of aggressive steering inputs, rapid acceleration, and heavy braking that typical RC cars experience, particularly important for crawler and off-road driving where precision control is critical.
• Additional Screw Clamping System — Beyond standard servo horn retention, this design incorporates an extra screw clamping mechanism that locks the horn firmly in place on your servo spline, virtually eliminating the possibility of the arm slipping or rotating under extreme load, a common problem with basic designs.
• 25-Tooth Spline Compatibility — Engineered specifically for 25-tooth servo splines found on quality Savox and Futaba servo motors, ensuring perfect fitment and engagement without play or gaps that could compromise steering precision and throttle response.
• Complete Installation Package — Comes supplied with stainless steel screw and aluminium countersunk washer, everything you need for immediate installation without hunting for additional hardware or worrying about incompatible fasteners.
• Proven Track Record with Popular RC Models — Compatible with numerous Traxxas TRX-4 variants including the Chevrolet K10 Cheyenne, Ford F-150 Ranger XLT, Chevrolet K5 Blazer, Nissan Pathfinder, and Ford Bronco, plus many other mainstream RC vehicles, demonstrating its widespread acceptance among the RC community.

Technical Performance

The Fastrax Heavy Duty Servo Arm represents a significant advancement over standard plastic servo horns commonly supplied with RC vehicles. Manufactured from precision-machined aluminium that has been hard anodised in professional black, this component offers substantially greater rigidity and load-bearing capacity than composite alternatives. The engineering approach focuses on eliminating deflection during high-stress manoeuvres—whether that's the precise steering inputs required for technical crawler work or the aggressive throttle and directional changes demanded by RC racing and bashing. The 25-tooth spline specification ensures compatibility with a broad range of quality servo motors including the popular Savox and Futaba ranges, which themselves are recognised for superior performance in competitive and recreational RC applications. The screw clamping system goes beyond simple friction retention, mechanically locking the horn to the servo spline with positive engagement that prevents the gradual slippage that develops with standard snap-fit designs over hundreds of operating hours. The inclusion of a stainless steel screw and aluminium countersunk washer demonstrates attention to detail—stainless fasteners resist corrosion in damp UK conditions, whilst the countersunk washer distributes clamping force more effectively than standard washers, reducing the risk of horn cracking around the spline hole. Real-world feedback from RC enthusiasts confirms this design delivers measurable improvements in steering feel and throttle consistency, particularly noticeable when transitioning from stock plastic horns to this heavy-duty alternative.

What's in the Box

• Fastrax Heavy Duty Servo Arm 25T (1 unit)
• Stainless steel mounting screw
• Aluminium countersunk washer

Frequently Asked Questions

• Is this servo arm suitable for my RC car? — This servo arm is engineered for 25-tooth Savox and Futaba servo splines. Check your servo specifications to confirm the tooth count matches before ordering. It's compatible with numerous popular vehicles including Traxxas TRX-4 models in various configurations, plus many other RC crawlers, truggies and off-road vehicles that use compatible servo specifications.
• What's the difference between aluminium and plastic servo horns for RC cars? — Aluminium servo arms like this Fastrax design deliver significantly greater rigidity, load capacity and longevity compared to plastic alternatives. Whilst plastic horns are lighter and adequate for casual driving, serious RC enthusiasts prefer aluminium because it resists flexing under aggressive steering inputs, won't crack from impact damage, and maintains consistent servo response over hundreds of operating hours without gradual degradation.
• Will this servo arm fit my Traxxas TRX-4? — Yes, this servo arm is specifically listed as compatible with multiple Traxxas TRX-4 variants including the Chevrolet K10 Cheyenne (available in black, red, and metallic blue finishes), Ford F-150 Ranger XLT, Chevrolet K5 Blazer, Nissan Pathfinder, and Ford Bronco models, provided your vehicle is fitted with a compatible Savox or Futaba servo with 25-tooth spline.
• Why choose this over the servo arm that came with my RC vehicle? — Original equipment servo horns are typically made from composite plastic designed for general use. The Fastrax heavy-duty alternative offers superior strength, corrosion resistance, and longevity—essential if you frequently bash your RC car, race competitively, or want to prevent servo horn failure that could ruin an outing. The additional screw clamping system provides mechanical locking that basic friction-fit designs cannot match.
• Is installation difficult? — Installation is straightforward. Remove your existing servo horn, clean the servo spline, align the Fastrax horn onto the spline, insert the supplied stainless steel screw with aluminium countersunk washer, and tighten moderately—this is a task any RC enthusiast can complete in minutes with basic hand tools.
• What if my servo horn breaks? — The heavy-duty aluminium construction is designed to resist breaking under normal RC use. However, if damage occurs from impact, the Fastrax can typically be replaced without affecting the servo itself, making this a cost-effective upgrade compared to replacing entire servo units.

Why Buy from RC Model Shop?

RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the Fastrax Heavy Duty Servo Arm 25T Single Fits Savox/Futaba (1) FAST311B today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.