Traxxas Button-Head Machine Screws 3x21mm M3 Hex Drive Revo Brake Bolts TRX4978

Overview

The Traxxas Screws, 3x21mm button-head machine (hex drive) (partially threaded, Revo brake bolts) are essential spare parts for RC enthusiasts maintaining their Traxxas models. Whether you're a seasoned RC car UK competitor or a weekend basher, these precision fasteners are crucial for keeping your RC vehicle in peak condition. Designed specifically as brake bolts for Traxxas Revo and compatible models, these screws ensure your braking system remains secure and reliable during intense off-road adventures.

RC maintenance is a vital part of the hobby, and having the correct replacement parts on hand means you can quickly get back to the track or trail. These button-head machine screws are manufactured to Traxxas specifications, guaranteeing perfect fit and performance. The partially threaded design means the unthreaded section provides a smooth bearing surface, which is critical for proper brake caliper operation on your ready to run RC car or custom build. Stock these in your spare parts box today and ensure your RC vehicle always performs at its best.

For UK RC enthusiasts looking for authentic Traxxas replacement parts, these screws represent genuine OEM quality that won't let you down. Perfect for maintenance, repairs, or building custom RC setups, they're a small investment that pays dividends in reliability and peace of mind.

Key Features

• M3 Machine Thread — Standard metric M3 threading ensures compatibility with Traxxas Revo brake systems and other applications requiring precise fastening, providing secure connection without risk of thread stripping.
• 3x21mm Dimensions — The 3mm diameter and 21mm length is specifically engineered for brake bolt applications on Traxxas RC vehicles, ensuring proper engagement depth and clamping force distribution.
• Button-Head Design — The distinctive button-shaped head provides a smooth, low-profile appearance whilst offering sufficient surface area for even clamping pressure across brake components, reducing the risk of component damage.
• Hex Drive Socket — The hexagonal driver socket accepts standard hex keys (Allen keys), allowing quick installation and removal without specialised tools, making maintenance and repairs straightforward for RC hobbyists.
• Partially Threaded Construction — The unthreaded section under the head creates a smooth, hardened bearing surface that's critical for brake caliper operation, allowing proper pivot action without binding or friction that could impair braking performance.
• Revo Brake Bolt Specification — Designed and engineered specifically as Revo brake bolts, these screws are optimised for the brake system architecture on Traxxas Revo 3.3 and compatible models, ensuring perfect fitment and operation.
• Pack of Six — Each package contains six screws, providing enough parts for complete brake system maintenance or to keep as emergency spares, ensuring you're never left without replacements when you need them most.
• Black Finish — The black colouring resists corrosion and provides a professional appearance, maintaining aesthetic consistency with modern Traxxas RC vehicles whilst protecting against rust and oxidation from moisture and salt water.
• Genuine Traxxas Parts — Manufactured by Traxxas to original specifications, these are authentic OEM parts that guarantee compatibility and performance, unlike cheap aftermarket alternatives that can cause fitment issues or premature failure.

Technical Performance

These M3 button-head machine screws represent precision engineering at its finest, crafted to exacting Traxxas standards for reliable performance in demanding RC applications. The 3x21mm dimensions have been carefully calculated to provide optimal engagement with brake caliper mounting points on Traxxas Revo vehicles, ensuring consistent clamping force and reliable brake function during high-speed runs and intense bashings. The partially threaded design is critical to performance—the unthreaded section beneath the button head serves as a hardened bearing surface that allows smooth rotation and pivoting of brake components without the friction and binding that would occur with fully threaded bolts. This engineering detail is what separates genuine Traxxas parts from inferior alternatives. The hex drive socket accepts standard 2.0mm or 2.5mm hex keys, commonly found in most RC tool kits. The black finish provides both aesthetic appeal and practical corrosion resistance, important when your RC vehicle encounters muddy trails, wet grass, or even saltwater environments. Built from hardened steel, these fasteners maintain their integrity under the vibration and stress of high-performance RC use, resisting loosening and failure. For anyone serious about maintaining their RC vehicle collection to factory specifications, these genuine Traxxas brake bolts are non-negotiable components that ensure safe, reliable operation.

What's in the Box

• 6x Traxxas 3x21mm button-head machine screws with hex drive (Revo brake bolts)

Frequently Asked Questions

• What vehicles are these Traxxas screws compatible with? — These button-head machine screws are specifically designed as Revo brake bolts for Traxxas Revo 3.3 and compatible Traxxas models that use the standard M3 brake caliper mounting system. Always check your vehicle's manual to confirm compatibility before installation.
• Why are partially threaded bolts better than fully threaded ones for brakes? — The unthreaded section under the head provides a smooth, hardened bearing surface that allows brake components to pivot and rotate freely without binding. Fully threaded bolts would create friction against the caliper body, potentially jamming the brake and degrading performance. This is why Traxxas specifically engineers their brake bolts with partial threading.
• How often should I replace these brake bolts on my RC car? — Brake bolts typically don't wear out quickly if properly maintained, but you should inspect them regularly for loosening, damage, or corrosion. Replace them immediately if you notice stripping, cracking, or persistent loosening. Many RC racers keep a spare set of brake bolts in their maintenance kit for emergency repairs at the track.
• Are these genuine Traxxas parts or aftermarket alternatives? — These are genuine OEM Traxxas parts manufactured to original factory specifications. Buying authentic Traxxas parts ensures proper fitment, reliable performance, and compatibility with your vehicle's brake system, unlike cheaper aftermarket screws that may have tolerance variations.
• What size hex key do I need to install these screws? — The hex drive socket on these M3 button-head screws typically accepts 2.0mm or 2.5mm hex keys, which are standard in most RC tool kits. Check your specific vehicle manual for the exact size recommended by Traxxas.
• Can I use these screws for applications other than Revo brakes? — Whilst these are specifically engineered as Revo brake bolts, the M3x21mm button-head machine thread design means they could potentially work for other applications requiring similar specifications. However, for optimal performance and proper fitment, they are designed and recommended for Traxxas Revo brake systems.
• Why should I buy genuine Traxxas parts instead of generic alternatives? — Genuine Traxxas parts are engineered to precise tolerances and specifications that ensure perfect fitment and performance. Brake system reliability is critical to safe RC operation, and using quality OEM parts means you can trust your vehicle to perform consistently without unexpected failures.

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 Screws, 3x21mm button-head machine (hex drive) (partially threaded, Revo brake bolts) (6 pcs) TRX4978 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.