Traxxas 4x6mm Button Head Machine Screw with Hex Drive Threadlock TRX3939

Overview

The Traxxas Screws, 4x6mm button-head machine (hex drive) (with threadlock) (6 pcs) TRX3939 are precision-engineered fasteners designed for RC enthusiasts who demand reliability and quality in every component of their RC models. Whether you're building a competition-grade RC buggy, maintaining your RC monster truck, or undertaking a complete restoration of your RC car, these screws represent the genuine Traxxas quality that has made the brand the fastest name in radio control across the UK and worldwide. These are not generic fasteners—they are factory parts that Traxxas engineers have specified for critical assembly points on numerous Traxxas vehicles, ensuring perfect fitment and durability under the demanding conditions of high-speed RC driving.

For the serious RC hobbyist in the UK, whether you're a weekend basher pushing your RC truck to its limits or a competitive racer fine-tuning every aspect of your setup, having access to genuine Traxxas replacement parts is essential. These button-head machine screws come pre-installed with threadlock, eliminating the need for you to apply additional threadlock compound and reducing the risk of fastener loosening during aggressive driving sessions. The hex drive design provides excellent grip and reduces the risk of stripping, making installation and removal straightforward with standard hex tools that every RC enthusiast should have in their workshop.

This pack of six screws is perfect for repairs, upgrades, or building Traxxas models from the ground up. The 4x6mm size is commonly used across Traxxas's range of high-performance RC vehicles, including the legendary Sledge monster truck range, making these screws an invaluable spare part to keep in your RC toolkit.

Key Features

• Button-Head Design — The rounded, low-profile button head provides a clean aesthetic while minimising snagging on suspension components, body panels, and other parts during assembly, disassembly, and high-speed operation. This design is preferred over standard flat-head screws in RC applications where space is limited and a professional finish is desired.
• Hex Drive (Allen Key Compatible) — The six-point internal hex drive socket accepts standard metric hex keys and drivers, providing superior grip compared to Phillips or slot-head designs. This means less likelihood of stripping the drive head during installation and removal, which is crucial when working with delicate RC components where over-tightening can cause damage.
• Pre-Applied Threadlock — Each screw comes with threadlock compound already applied to the threads, eliminating the need to purchase and apply threadlock separately. This factory-applied threadlock prevents vibration-induced loosening during high-speed runs, cornering, and jumps, providing peace of mind that your fasteners will stay secure throughout your RC sessions without the mess of applying liquid threadlock in your workshop.
• M4 Metric Size (4x6mm) — The 4mm diameter shaft with 6mm length is a standard metric size used extensively across Traxxas's vehicle range, particularly on monster trucks like the Sledge, making these screws instantly compatible with numerous models and perfect for repairs, upgrades, or spare parts inventory.
• Pack of Six — Six pieces per pack provides enough fasteners for a single major repair, multiple minor repairs, or complete assembly of smaller RC components where 4x6mm screws are specified in the technical documentation.
• Genuine Traxxas Parts — These are authentic OEM (original equipment manufacturer) parts from Traxxas, not aftermarket substitutes, ensuring they meet Traxxas's strict quality standards and will perform exactly as the engineers intended on your RC model.

Technical Performance

The Traxxas Screws TRX3939 represent precision fastening engineering optimised for the demands of modern RC vehicles. The 4x6mm dimension provides an ideal balance of clamping force and minimal weight penalty—critical considerations in RC design where every gram matters. The button-head design reduces the overall height of the fastened assembly compared to larger screw heads, important when clearances are tight in modern compact RC designs. The hexagonal drive is a six-point pattern that distributes load more evenly across the drive tool than Phillips drives, reducing the likelihood of cam-out during installation. The factory-applied threadlock is a medium-strength formulation that prevents loosening under vibration whilst remaining removable with standard hand tools—you won't need heat or special solvents to remove these screws for maintenance. The stainless steel or hardened steel construction (typical of Traxxas fasteners) resists corrosion and maintains integrity through thousands of installation and removal cycles, making these screws suitable for both indoor carpet racing and outdoor dirt or wet conditions common in the UK RC scene. Whether you're running on the tarmac at your local RC track, bashing through muddy fields, or competing in organised UK RC championships, these fasteners deliver the reliability that Traxxas is known for.

What's in the Box

• 6 x Traxxas 4x6mm button-head machine screws with hex drive and pre-applied threadlock

Frequently Asked Questions

• What vehicles are these screws compatible with? — These 4x6mm button-head machine screws are compatible with multiple Traxxas vehicles, including the Sledge monster truck range (available in green, red, blue, and orange variants). Check your specific vehicle's spare parts diagram or manual to confirm fitment, or contact our expert team for compatibility advice on your particular RC model.
• Can I reuse screws that already have threadlock applied? — Yes, the medium-strength threadlock applied to these screws is designed to be removable. You can remove and reinstall these screws multiple times, though the threadlock compound will gradually wear down with repeated use. For permanent assemblies, you may wish to apply fresh threadlock when reinstalling, though in most RC applications the factory threadlock provides sufficient security for the vehicle's lifespan.
• What tools do I need to install these screws? — You will need a metric hex key (Allen key) set, specifically a 1.5mm or 2mm hex key (the exact size should be specified in your vehicle's manual or parts diagram). These are standard tools found in most RC enthusiasts' workshops and are inexpensive to purchase if you don't already own them. A hand screwdriver with interchangeable hex bits, or a cordless drill with a hex drive bit, can make installation faster and easier, particularly when assembling multiple parts.
• Are these screws stainless steel? — Traxxas fasteners are engineered to resist corrosion and maintain integrity through repeated use. Whilst the exact material composition isn't detailed in the standard specification, these screws are manufactured to Traxxas's quality standards and will resist corrosion from typical UK environmental exposure, whether you're running in dry conditions or occasionally in wet terrain.
• How many screws do I need for a complete vehicle assembly? — The number of 4x6mm screws required depends entirely on which Traxxas vehicle you're building or repairing. This pack of six provides sufficient fasteners for one major repair or multiple smaller repairs. We recommend consulting your vehicle's instruction manual or spare parts diagrams for the exact quantity needed, or our team can advise you on the total fastener requirements for your specific model.
• Is threadlock poisonous or dangerous? — The threadlock compound applied to these screws is an industrial-grade adhesive that is safe when used as intended. Avoid contact with eyes and skin, and wash hands after handling. The applied threadlock is in a cured or semi-cured state and poses minimal risk during normal handling and installation. Always ensure you are working in a well-ventilated area when handling fasteners, and follow standard workshop safety practices.
• Can these screws be used in wet conditions? — Yes, these screws are suitable for use in wet conditions common to UK RC environments. The button-head design helps shed water, and the quality construction resists rust. For extended wet-condition use, ensure your entire RC vehicle has appropriate waterproofing on electronics, and perform regular maintenance to keep fasteners clean and free from corrosion.

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, 4x6mm button-head machine (hex drive) (with threadlock) (6 pcs) TRX3939 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.