Overview
The Fastrax Jumbo Servo Single 15T Spline FAST325B is a premium aluminium servo horn designed for serious RC enthusiasts who demand precision and durability in their RC car setups. Whether you're piloting a high-performance rock crawler, a competitive off-road buggy, or a scale trail truck, this servo horn delivers the quality and reliability you need to keep your RC model performing at its best. Built from robust aluminium with a black anodised finish, this single servo horn is engineered to withstand the demands of competitive RC racing and challenging terrain exploration across the UK and beyond.
This is not just another servo accessory – it's a critical component that bridges your servo motor to your steering mechanism, and choosing the right one can mean the difference between responsive, accurate steering and disappointing control lag. The Fastrax Jumbo Servo Single 15T Spline is specifically engineered for compatibility with premium servo options including Savox Jumbo, Multiplex Rhino Digi 4, Losi 5T, and Hitec HS5755MG, HS805MG, HS5805MG, and HS5765M servos, making it an excellent choice for builders upgrading their RC models with high-torque, high-speed servos.
For RC enthusiasts in the UK looking to upgrade their steering systems, this servo horn represents excellent value at just £9.99, and its proven compatibility with leading servo brands means you can confidently integrate it into your RC build without compatibility concerns.
Key Features
- 15T Spline Design — The 15-tooth spline pattern is the industry standard for jumbo-class servos, ensuring secure engagement with your servo shaft and preventing stripping or slippage during aggressive steering inputs or high-load situations on difficult terrain.
- Premium Aluminium Construction — Machined from high-quality aluminium alloy, this servo horn offers an excellent balance of lightweight design and structural rigidity, helping to reduce unsprung weight in your RC model while maintaining the strength needed for demanding applications.
- Black Anodised Finish — The professional black anodised coating not only looks great but also provides corrosion resistance and durability, protecting against the elements during outdoor RC adventures across wet UK terrain and dusty competition venues.
- Single Horn Configuration — The single horn design keeps your steering linkage clean and simple, reducing complexity in your build whilst maintaining full control authority over your steering system.
- Universal Compatibility — Engineered to fit Savox Jumbo, Multiplex Rhino Digi 4, Losi 5T, and Hitec HS5755MG, HS805MG, HS5805MG, and HS5765M servos, this horn works with some of the most popular and respected servo options in the RC hobby, giving you flexibility in your servo choice.
- Suitable for Fixed and Servo Saver Mount — Whether you're running a traditional fixed servo setup or using a servo saver to protect your servo gears during impacts, this horn accommodates both configurations, making it adaptable to different RC car designs and build philosophies.
Technical Performance
The Fastrax Jumbo Servo Single 15T Spline represents the kind of precision engineering that makes a real difference in RC performance. Built from high-grade aluminium, this servo horn combines lightweight construction with exceptional durability. The 15-tooth spline pattern is precisely machined to ensure a tight, repeatable fit with compatible servo shafts, eliminating any play or backlash that could compromise steering accuracy. This level of precision is particularly important for RC car UK competitors who rely on crisp, immediate steering response during high-speed cornering or technical crawling sections. The black anodised finish provides not only aesthetic appeal but genuine functional protection, resisting corrosion from wet grass, muddy terrain, and road salt – challenges common to UK-based RC enthusiasts. The horn's design accommodates both fixed and servo saver mounting options, giving builders flexibility in how they configure their steering systems. Whether you're constructing a competition-grade crawler that demands millimetre-perfect steering precision or building a recreational basher that needs robust reliability, the engineering quality of this component ensures consistent performance over hundreds of hours of operation.
What's in the Box
- Fastrax Jumbo Servo Single 15T Spline servo horn
Frequently Asked Questions
- Which servos does the Fastrax 15T Jumbo Servo Horn fit? — This servo horn is specifically designed to fit Savox Jumbo, Multiplex Rhino Digi 4, Losi 5T, and Hitec HS5755MG, HS805MG, HS5805MG, and HS5765M servos. Always verify your servo model before purchasing to ensure compatibility with your RC setup.
- What is the difference between a 15T and other spline patterns? — The 15-tooth spline pattern is the standard for jumbo-class servos and offers a good balance between strength and ease of engagement. Different tooth counts (such as 23-tooth designs) are found on other servo classes, so it's important to match your servo horn to your specific servo model.
- Is this servo horn suitable for beginners? — Yes, this servo horn is suitable for both beginners and experienced RC enthusiasts. Installation is straightforward – it simply slides onto your servo shaft and is secured with a set screw. Beginners should ensure they have the correct servo model before purchasing.
- Can I use this horn with a servo saver? — Yes, the Fastrax 15T Jumbo Servo Horn is designed to work with both fixed servo mounts and servo saver units. A servo saver is a protective component that allows some movement before transmitting force to the servo, helping protect servo gears during heavy impacts – a popular upgrade in the UK RC community.
- What makes aluminium a good choice for servo horns? — Aluminium offers an ideal combination of properties for servo horns: it's significantly lighter than steel, reducing the mass in your steering system, yet strong enough to handle the torque loads from high-power servos. The black anodised coating adds corrosion resistance, making it durable for outdoor UK RC adventures.
- How do I install this servo horn on my servo? — Installation is simple: align the horn's spline with your servo shaft and slide it on until it seats fully. Use the included set screw to secure it firmly, ensuring the horn cannot rotate on the shaft. Most installations take just a few minutes with a basic hex wrench.
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 Jumbo Servo Single 15T Spline FAST325B 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.
- Brand: Fastrax
- Model Number: FAST325B
- EAN Code: 5055323954429
- Product Type: Servo Horn
- Spline Type: 15-tooth
- Spline Pattern: Single
- Material: Aluminium
- Finish: Black anodised
- Configuration: Single horn design
- Compatible Servo Types: Savox Jumbo, Multiplex Rhino Digi 4, Losi 5T
- Compatible Servo Models: Hitec HS5755MG, HS805MG, HS5805MG, HS5765M
- Mount Type: Suitable for servo saver or fixed mounting
- Stock Status: In stock
We want to make sure your delivery goes smoothly, so here are some important details about our service:
- For orders above £120, we offer delivery to most mainland UK addresses. For orders under £120, we can still deliver to Northern Ireland and the outlying isles, as long as the item can be sent by Royal Mail, weighs less than 30kg, and fits within 61cm × 46cm × 46cm. Some highland and remote areas may carry an extra delivery charge as couriers often apply surcharges in these locations. If you live in one of these areas, feel free to contact us before ordering so we can confirm the delivery options and costs for you.
- Most of our products include delivery in the price. If your order is under £90, a small delivery fee will apply but do not worry this will always be clearly shown at checkout before you complete your purchase.
- Depending on what you choose at checkout, your order will usually be delivered either the next working day or within 2 working days. For next day delivery please place your order before 2:00pm. Orders are dispatched Monday to Friday only. Some items may take a little longer and if that is the case we will always show the expected delivery time on the product page.
- If your order includes items with different dispatch times we will normally wait and send everything together once all items are in stock. If one of the items is going to take a while we will give you the choice either wait for everything to arrive or let us send the available items now and deliver the rest later. It is up to you.
- We use trusted delivery partners to make sure your order gets to you safely and on time. We use DPD for next working day deliveries and Royal Mail for the 2 day option.
- As soon as your order is on its way we will send you a tracking number by email. If you provide your mobile number at checkout we will also send delivery updates straight to your phone so you can keep an eye on progress.
- If a product is marked as "Dispatched within 3 working days" delivery usually takes around 3 to 5 working days from when your order is placed.
- For customers in Inverness and other parts of the Scottish Highlands deliveries can take up to 2 working days even if you select next day delivery as couriers do not currently offer a guaranteed next day service to those areas.
