These high-quality Cap Head Screws are the perfect replacement items for servicing your ARRMA vehicle.
Features
- Strong steel material for long-lasting durability and consistent fit
- Precision manufactured threads for fast and easy maintenance
- Bagged in multiples so you always have spares
Includes
4 x Cap Head Screws – M3 x 40mm
- Product Type: Cap Head Hex Machine Screw
- Manufacturer: ARRMA
- Part Number: Z-ARA723340
- EAN Code: 5052127041560
- Screw Size: M3 x 40mm
- Thread Type: Machine Thread
- Head Type: Cap Head (Hex Socket)
- Driver Type: Hex Socket (2.5mm hex driver required)
- Material: Steel
- Finish: Black
- Pack Contents: 4 screws
- Length: 40mm
- Diameter: M3
- Compatible Models: C-ARA4408V2T3 ARRMA 1/10 Kraton 4X4 4S V2 BLX Speed Monster Truck RTR; C-ARA4408V2T4 ARRMA 1/10 Kraton 4X4 4S V2 BLX Speed Monster Truck RTR Green; C-ARA4410V2T3 ARRMA 1/10 Outcast 4X4 4S V2 BLX Stunt Truck RTR Gunmetal; C-ARA4410V2T4 ARRMA 1/10 Outcast 4X4 4S V2 BLX Stunt Truck RTR Red
Overview
The ARRMA Cap Head Hex Machine Screw M3x40mm is an essential replacement part for RC enthusiasts and serious hobbyists who maintain their own RC vehicles. Whether you're a weekend basher enjoying your RC car UK collection, a competition racer fine-tuning your ready to run RC setup, or a dedicated technician servicing multiple brushless RC models, these precision-engineered fasteners are indispensable. ARRMA has earned a reputation as one of the leading manufacturers of high-performance RC vehicles in the UK market, and their attention to detail extends to every component, including these critical hardware items.
This pack contains four high-quality cap head hex machine screws, each measuring M3 by 40mm, making them ideal for numerous assembly and maintenance applications across a wide range of ARRMA RC vehicles. The substantial 40mm length makes these screws particularly useful for applications requiring deeper engagement or longer reach, such as suspension mounting points, motor mounts, or drivetrain components. These are not generic fasteners—they are OEM (original equipment manufacturer) parts designed specifically to meet ARRMA's exacting standards for fit, finish, and reliability. If you own an ARRMA 1/10 scale RC monster truck, stunt truck, or other high-performance RC vehicle, having spare cap head screws in your spares box is essential for quick field repairs and regular maintenance.
Cap head hex screws offer distinct advantages over other fastener types, particularly in RC applications. The hexagonal socket head design allows for precise torque application using a hex driver (Allen key), providing excellent control when tightening fasteners during assembly or maintenance work. This design also minimises the risk of stripping the screw head, a common problem with Phillips or slot-head alternatives. For RC enthusiasts who regularly service their vehicles to maintain peak performance and longevity, quality fasteners like these ARRMA cap head screws represent a smart investment in reliability and ease of maintenance.
Key Features
- Strong Steel Material — Manufactured from high-quality steel that delivers exceptional durability and long-lasting performance even under the demanding conditions of regular RC vehicle use, ensuring consistent fit and reliable fastening across multiple assembly and disassembly cycles.
- Cap Head Hex Socket Design — The hexagonal socket head configuration allows for precision torque application using a standard hex driver (Allen key), providing superior control during tightening and reducing the risk of head stripping compared to alternative fastener designs.
- Precision Manufactured Threads — Each screw features precisely manufactured threads that engage cleanly and consistently with threaded inserts or holes, enabling fast and effortless maintenance work and ensuring repeatable assembly quality every time.
- M3 x 40mm Specification — The M3 diameter with 40mm length makes these screws suitable for a wide variety of mounting applications, from suspension components to drivetrain elements, offering deeper engagement and longer reach where required.
- Supplied in Multiples — This pack includes four screws, ensuring you always have spare fasteners on hand for replacement, maintenance, or spare parts builds, reducing downtime and keeping your RC hobby moving forward.
- OEM ARRMA Quality — These are genuine ARRMA factory parts, not aftermarket substitutes, guaranteeing compatibility and performance across the ARRMA RC vehicle lineup including the Kraton and Outcast ranges.
- Black Finish — The professional black coating provides visual consistency with ARRMA build standards whilst offering modest corrosion resistance in typical hobby use conditions.
Technical Performance
These cap head hex machine screws represent ARRMA's commitment to engineering excellence in every detail of their RC vehicle design. At M3 diameter, these fasteners are sized to work with the precision-machined aluminium and steel components found throughout modern 1/10 scale RC monster trucks, stunt trucks, and buggies. The 40mm length is particularly significant, as it allows for applications requiring substantial thread engagement or longer reach across multiple component layers—a critical consideration in complex RC assemblies where suspension arms, motor plates, or transmission housings must be securely fastened. The machine thread design (as opposed to wood or self-tapping thread) means these screws are intended for use with pre-threaded holes or inserts, a standard approach in precision RC engineering where repeatability and consistent torque application are paramount. The hexagonal socket head is precision-formed to ensure perfect engagement with the corresponding hex driver, minimising wobble and slipping that could lead to fastener damage or inconsistent tightening. The steel material has been carefully selected to provide the hardness necessary for reliable repeated assembly and disassembly cycles, something that matters deeply to RC enthusiasts who regularly service, upgrade, and modify their vehicles. For owners of ARRMA 1/10 scale models such as the Kraton 4X4 4S V2 BLX Speed Monster Truck RTR or the Outcast 4X4 4S V2 BLX Stunt Truck RTR, maintaining an inventory of genuine OEM fasteners ensures that maintenance and repairs can be completed quickly and reliably without substituting inferior aftermarket alternatives.
What's in the Box
- 4 x ARRMA Cap Head Hex Machine Screws M3 x 40mm (black steel)
Frequently Asked Questions
- What size hex driver do I need for these ARRMA cap head screws? — The M3 cap head screws accept a standard 2.5mm hex driver (also called a 2.5mm Allen key). Make sure your hex driver set includes this common size for reliable fastener engagement and torque application.
- Are these screws compatible with my ARRMA RC vehicle? — These genuine ARRMA OEM parts are designed for compatibility across multiple ARRMA 1/10 scale models, including the Kraton 4X4 4S V2 BLX Speed Monster Truck RTR in both standard and green colour options, as well as the Outcast 4X4 4S V2 BLX Stunt Truck RTR in both gunmetal and red variants. If you own one of these ARRMA models or other recent 1/10 scale ARRMA vehicles, these fasteners are compatible with your setup. Always consult your vehicle manual or parts diagram if you're unsure about fitment.
- Why should I use genuine ARRMA fasteners instead of generic replacements? — Genuine OEM ARRMA screws are engineered to exact specifications for fit, hardness, and thread quality, ensuring reliable performance and compatibility with your RC vehicle. Generic fasteners may vary in material quality, thread precision, or head dimensions, potentially leading to fitment issues, slipping hex socket engagement, or inconsistent torque application. For RC enthusiasts who invest significantly in quality vehicles, using genuine parts protects that investment.
- How many screws come in this pack and is that enough? — This pack contains four M3x40mm cap head screws. Depending on your maintenance needs and vehicle complexity, you may wish to purchase multiple packs to build a comprehensive spares inventory. A well-stocked RC workshop typically maintains multiple packs of common fastener sizes for convenient access during maintenance and repairs.
- What is the difference between a cap head screw and other fastener types? — Cap head screws feature a cylindrical head with a hexagonal socket (also called Allen head or hex socket head), offering several advantages over Phillips head, slot head, or other designs. The hexagonal socket allows precise torque control with a hex driver, resists stripping better than Phillips head designs, and provides a more professional appearance. Machine screws like these are designed for use with pre-threaded holes or inserts rather than self-tapping or wood thread variants.
- Can these screws be reused multiple times or should I replace them? — High-quality steel cap head screws like these ARRMA fasteners can typically be reused multiple times if handled carefully. However, if you notice stripped heads, bent shanks, or damaged threads, replacement is recommended. Regular inspection during maintenance is good practice for RC hobbyists who frequently service their vehicles.
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 ARRMA Cap Head Hex Machine Screw M3x40mm (4) Z-ARA723340 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.
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