Traxxas 3x8mm Cap Head Machine Screws with Split Washers and 2.5mm Hex Wrench TRX1552

Overview

The Traxxas Backplate screws (3x8mm cap-head machine) pack represents an essential upgrade for RC enthusiasts across the UK who demand superior engine security and reliability. Whether you're running a Traxxas Nitro engine rebuild or maintaining your existing RC car, these precision-engineered fasteners provide the secure motor mounting that serious RC drivers depend on. This is not just another generic screw set—this is a purpose-built component designed specifically for Traxxas engines, engineered to withstand the intense vibration and stress that comes with high-performance nitro RC driving.

If you own a Traxxas Stampede, Slash, Rustler, TRX-4, Sledge, WideMaxx, Ford Fiesta ST Rally, or any other compatible Traxxas model, you understand the importance of reliable engine fastening. The original washerhead machine screws that secure the motor to the motor plate can work loose over time, but these professional-grade cap head machine screws provide a more secure mounting solution. RC car UK enthusiasts know that engine vibration is one of the biggest threats to component longevity, and proper fastening is your first line of defence against costly damage.

This complete kit includes everything you need for a professional engine rebuild or maintenance session: six cap head machine screws, six split washers for load distribution, and a dedicated 2.5mm hex wrench for precise installation. The included tools mean you're ready to get to work immediately without hunting through your toolbox for the right size wrench. Whether you're a competitive racer, a weekend basher, or simply someone who takes pride in maintaining their RC car, this Traxxas spare parts pack delivers the quality and completeness you expect from the world's leading RC manufacturer.

Key Features

• 3x8mm Cap Head Machine Screws — The M3 (3mm diameter) threading with 8mm length provides the exact fastening specification required for Traxxas engine backplate assembly, ensuring proper fit without risk of thread stripping or component damage during installation.
• Six Precision-Engineered Fasteners — This generous quantity allows for complete backplate reassembly with spare fasteners on hand, so you're never caught short during an engine rebuild or maintenance session.
• Six Split Washers Included — Split washers are essential for distributing load evenly across the backplate surface and preventing screws from working loose due to engine vibration during operation, which is a critical consideration for high-performance nitro RC driving.
• Dedicated 2.5mm Hex Wrench — The included hex wrench (Allen key) guarantees you have the exact tool needed for installation, eliminating any guesswork and ensuring proper torque application without damaging the screw head.
• Black Finish — The professional black colour matches original Traxxas components and resists corrosion, maintaining appearance and longevity even after repeated use and exposure to nitro fuel residue.
• Machine Thread Design — Machine threading (as opposed to self-tapping) ensures clean, consistent grip on the backplate component without risk of material damage, critical for protecting expensive engine castings.
• Professional-Grade Construction — These are authentic Traxxas genuine parts, not aftermarket substitutes, meaning they meet the exacting standards Traxxas demands for engine integrity and long-term reliability.
• Wide Compatibility — This kit is compatible with an extensive range of Traxxas models including the Stampede, Slash, Rustler, TRX-4, Sledge, WideMaxx, Ford Fiesta ST Rally, and many more, making it an invaluable addition to any Traxxas owner's spare parts collection.

Technical Performance

The engineering behind these backplate screws reflects Traxxas's commitment to precision and durability. Each screw features M3 (metric 3mm) machine thread sizing, which is the industry standard for engine backplate fastening on high-performance nitro RC engines. The 8mm length is precisely calculated to pass through the backplate and engage properly in the crankcase threads without bottoming out or creating excessive protrusion. The cap head design (also called socket head cap screw) provides superior load distribution compared to washerhead alternatives, and the rounded top profile reduces the risk of accidental damage to surrounding components during installation and removal. The inclusion of split washers is particularly important in RC applications because engine vibration is relentless—split washers work by creating spring tension that resists vibration-induced loosening, a common failure mode in RC engines subjected to high RPM operation. The 2.5mm hex size matches the industry-standard hex key dimensions, ensuring compatibility with quality tools and reducing the risk of bit slippage that can strip the socket and render fasteners impossible to remove. These components are manufactured to precision tolerances that allow them to be tightened in a criss-cross pattern (as specified in the Traxxas Pro.15 engine rebuild manual) to ensure even pressure distribution across the backplate gasket seal. The black oxide finish resists corrosion from nitro fuel exposure and provides a professional appearance that coordinates with authentic Traxxas components.

What's in the Box

• 6x 3x8mm cap head machine screws (M3 x 8mm)
• 6x split washers
• 1x 2.5mm hex wrench (Allen key)

Frequently Asked Questions

• What is the difference between cap head screws and washerhead screws for RC engine mounting? — Cap head machine screws (socket head cap screws) provide superior load distribution and clamping force compared to washerhead screws, which is why they are recommended as an upgrade for more secure motor mounting. The cap head design allows for higher torque application without damaging the surrounding material, and the dedicated split washers work together with the cap head geometry to resist vibration-induced loosening. For serious RC car UK users who demand reliability, cap head screws represent the professional-grade solution.
• Why are split washers essential for engine backplate fastening? — Split washers function as spring elements that maintain constant tension on the screw even as engine vibration causes micro-movements in the backplate assembly. Without washers, repeated vibration from high-RPM nitro engine operation causes screws to gradually loosen, leading to backplate movement, coolant leaks, and potential engine damage. The washers included in this kit provide the load distribution and vibration resistance that keeps your engine secure during operation.
• How do I know if my Traxxas RC model is compatible with this screw kit? — This backplate screw kit is compatible with a wide range of Traxxas models including Stampede, Slash, Rustler, TRX-4, Sledge, WideMaxx, Ford Fiesta ST Rally, and others. The best way to verify compatibility is to consult your vehicle's manual or contact your Traxxas retailer, but if your Traxxas model uses a Pro.15 series nitro engine, this kit will be suitable. The 3x8mm specifications match the standard engine backplate fastening requirements across most Traxxas nitro and brushless models.
• What is the proper installation procedure for these backplate screws? — According to the Traxxas Pro.15 engine rebuild manual, you should install the backplate and new backplate gasket using these 3x8mm cap head machine screws, then tighten the screws in small increments using a criss-cross pattern (like tightening wheel nuts) until all screws are evenly tight. This criss-cross approach distributes pressure evenly across the gasket seal and prevents warping or uneven compression. The included 2.5mm hex wrench is the correct size for this procedure.
• Should I replace my backplate gasket when installing these new screws? — Yes, the Traxxas Pro.15 engine rebuild manual specifically recommends replacing the backplate gasket with a new gasket during reassembly. Even if the gasket appears undamaged, repeated use causes gasket material to compress and lose its sealing properties. Using new gaskets alongside these professional-grade screws ensures maximum engine reliability and prevents leaks that could damage your RC car UK investment.
• Can I use these screws for other RC applications besides engine backplate mounting? — Whilst these screws are specifically engineered for Traxxas engine backplate mounting, the 3x8mm M3 specifications are industry-standard dimensions that may work for other RC applications requiring cap head machine screws. However, to guarantee compatibility and avoid potential damage to expensive components, it is best to use these screws for their intended purpose—engine backplate fastening on compatible Traxxas models.
• How often should I inspect or tighten these backplate screws? — Traxxas recommends checking engine fasteners regularly, especially after extended run sessions. Engine vibration can gradually cause fasteners to work loose even with split washers installed. Before each run session, perform a visual inspection of the backplate area and gently test screw tightness with your hex wrench—they should be snug but not over-tightened, as excessive torque can damage the crankcase threads. Re-tighten using the criss-cross pattern if any movement is detected.

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 Traxxas Backplate screws (3x8mm cap-head machine) (6 pcs) / washers (6 pcs) / wrench TRX1552 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.