Losi Button Head Screws 5-40 x 20mm Left Hand Thread Black Z-LOSA6284

• Part Number: Z-LOSA6284
• EAN: 605482006252
• Manufacturer: Losi
• Part Type: Hardware
• Screw Size: 5-40
• Length: 20mm
• Head Type: Button Head
• Driver Type: Hex
• Thread Type: Machine Thread
• Thread Direction: Left Hand
• Finish: Black Oxide
• Colour: Black
• Application: Suspension arm to shock mounting
• Compatible Vehicle: Losi 8IGHT™ Buggy
• Mounting Locations: Left rear and right front suspension arms
• RRP: £9.99

Overview

The LOS Button Head Screws, 5-40 x 20mm BHS, Left Hand Thread: 8B (Z-LOSA6284) are precision engineering components designed specifically for Losi 8IGHT™ Buggy owners and RC enthusiasts across the UK who demand reliability and performance from their RC cars. These left-hand threaded screws represent a thoughtful engineering solution to one of the most frustrating problems in RC racing: shock screws backing out during intense competition or casual bashing. Whether you're running your 8IGHT buggy in a local race meeting or enjoying weekend bashing sessions, these screws provide the secure fastening you need to keep your suspension components precisely where they belong throughout your run.

As an authorised Losi retailer, RC Model Shop stocks genuine LOS Button Head Screws that meet the manufacturer's exacting standards for quality and performance. These are not generic fasteners—they are engineered specifically for the Losi 8IGHT platform and come with the backing of the manufacturer's rigorous quality control. The 5-40 metric sizing and 20mm length make these screws the perfect fit for suspension arm to shock mounting applications on Losi's legendary 8IGHT buggy platform, which remains one of the most competitive and respected RC vehicles in the off-road racing community.

When you choose these button head screws for your RC buggy, you're choosing performance reliability and the peace of mind that comes with genuine OEM parts. The left-hand thread design is not a random specification—it's an intentional feature engineered to work with the suspension geometry of the 8IGHT buggy specifically on the left rear and right front suspension arms, where vibration and shock loads are most likely to cause standard right-hand threaded fasteners to loosen over time.

Key Features

• Left-Hand Threaded Design — The left-hand threading on these button head screws eliminates the bottom shock screw from backing out during long runs, addressing one of the most common maintenance issues RC racers face during competition or extended bashing sessions. This clever engineering solution means you can focus on your driving rather than constantly retightening fasteners.
• Suspension Arm to Shock Mounting — These screws are purpose-built for securing suspension arms to shock absorbers, one of the most critical connection points on your RC buggy. Proper fastening at this location directly impacts your vehicle's handling characteristics, stability, and overall driving experience across varied terrain.
• Designed for 8IGHT™ Buggies — Engineered specifically for Losi's acclaimed 8IGHT buggy platform, these screws integrate seamlessly into the suspension geometry and mounting points of this competition-grade RC vehicle. Using manufacturer-approved fasteners ensures optimal performance and compatibility with your buggy's engineering specifications.
• Strategic Placement for Maximum Reliability — Only needed on the left rear and right front suspension arms, this specific placement targets the suspension points where vibration and stress loads are most severe, providing fail-safe fastening exactly where it matters most during high-performance driving.
• Black Oxide Finish for Easy Identification — The black oxide coating serves a dual purpose: it provides corrosion resistance to protect your fasteners from the elements and road debris, and it offers easy visual identification so you can quickly spot these specialised left-hand screws when maintaining or repairing your RC buggy. This finish also prevents the screws from becoming mixed with standard right-hand threaded fasteners.
• Machine Thread Precision — Manufactured as machine threads with button head configuration, these screws offer precise, repeatable fastening with minimal play. The button head design provides excellent grip for hex drivers whilst maintaining a compact profile that doesn't interfere with surrounding suspension components or create snag points during assembly and disassembly.
• Genuine OEM Specification — As genuine Losi components, these screws meet the manufacturer's engineering specifications and quality standards, ensuring they perform exactly as the 8IGHT buggy designers intended for maximum reliability and longevity.

Technical Performance

The LOS Button Head Screws represent precision engineering in fastener design, combining specific sizing (5-40 x 20mm) with a left-hand thread profile that defies conventional fastener logic whilst delivering practical benefits to competitive RC racers and serious hobbyists. The 20mm length provides sufficient engagement in the suspension arm mounting points whilst maintaining a compact overall profile. The 5-40 metric specification refers to the screw diameter and thread pitch, dimensions that have been carefully selected to provide adequate holding power without adding unnecessary weight or creating stress concentration points in the aluminium suspension components typical of modern RC buggies. The button head configuration offers superior access for hex driver application, particularly important when working within the confined spaces of a buggy's suspension assembly. Built with black oxide coating, these fasteners offer improved corrosion resistance compared to bare steel, extending their service life even when exposed to moisture, road salts, and the general environmental stresses that RC vehicles experience during outdoor use. The left-hand threading is the engineering star of these screws—by rotating counter-clockwise to tighten (opposite to standard fasteners), the natural vibration and rotational forces experienced during driving actually work to keep the screw seated firmly rather than loosening it. This is particularly effective on the left rear and right front suspension arms of the 8IGHT buggy, where suspension loads and shock mounting stresses create the most significant vibration concerns. Whether you're running your RC buggy in competitive racing environments where millisecond reliability differences matter, or enjoying casual weekend bashing where durability is paramount, these OEM specification screws deliver the fastening consistency that keeps your suspension geometry stable and your handling predictable throughout every run.

What's in the Box

• Set of LOS Button Head Screws, 5-40 x 20mm, Left Hand Thread, Black Oxide finish

Frequently Asked Questions

• Why do I need left-hand threaded screws instead of standard right-hand screws for my RC buggy? — Left-hand threading works with the natural vibration and rotational forces in your buggy's suspension to keep fasteners tight rather than allowing them to loosen. On the left rear and right front suspension arms where shock mounting stresses are highest, standard right-hand screws tend to back out during runs. Left-hand threaded screws tighten under these same vibration conditions, eliminating this annoying maintenance problem and keeping your suspension geometry stable throughout long races or bashing sessions.
• What is the 5-40 specification on these button head screws? — The 5-40 designation refers to the metric screw size and thread pitch. These dimensions have been specifically selected for Losi 8IGHT buggy suspension mounting applications, providing adequate holding power whilst maintaining the lightweight engineering principles critical to RC vehicles. The 20mm length ensures proper engagement in the suspension arm mounting points without over-extending into surrounding components.
• Will these screws fit my RC buggy? — These screws are engineered specifically for Losi 8IGHT™ Buggies and are intended for suspension arm to shock mounting on the left rear and right front suspension arms. If you own an 8IGHT buggy, these are genuine OEM replacement fasteners that will fit perfectly. For other RC vehicle platforms, you should verify compatibility with your manufacturer's specifications before purchasing.
• Are these genuine Losi parts? — Yes, these are genuine OEM Losi components manufactured to the brand's engineering specifications and quality standards. When you purchase from RC Model Shop, you're receiving authentic parts backed by the manufacturer, ensuring they perform exactly as designed and integrate seamlessly with your buggy's suspension system.
• How many screws are included in this set? — The package contains a set of button head screws suitable for securing suspension arms to shock absorbers on your Losi 8IGHT buggy. Whilst the exact quantity isn't specified on this product page, these are sold as a set of replacement fasteners for your suspension maintenance needs.
• What does the black oxide coating do? — The black oxide finish serves two important functions: it provides corrosion resistance to protect your fasteners from moisture, road salts, and environmental exposure during outdoor RC driving, and it offers visual identification so you can easily distinguish these left-hand threaded screws from standard right-hand fasteners when maintaining your buggy. This prevents accidentally installing the wrong screw type during repairs.

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 LOS Button Head Screws, 5-40 x 20mm BHS, Left Hand Thread: 8B Z-LOSA6284 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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