Aluminum Alloy Phillips Countersunk Screws — Lightweight Fastening for Weight-Critical Builds
Every gram matters when you're building RC aircraft, drone frames, lightweight bicycle components, or precision electronics enclosures. Standard steel screws add unnecessary weight to assemblies where performance depends on keeping mass low. These aluminum alloy Phillips countersunk flat head machine screws deliver a secure, flush-fit fastening solution at a fraction of the weight of steel — without sacrificing the corrosion resistance you need for long-term reliability.
Each screw is machined from aluminum alloy with an anodized surface treatment that enhances corrosion resistance and provides a clean, natural aluminum finish. Available in thread diameters from M3 to M10 and lengths from 6mm to 50mm (approximately 0.24" to 1.97"), with pack quantities ranging from 5 to 100 pieces depending on size. The countersunk flat head profile sits flush with the surface for a clean, low-profile result on panels, frames, and enclosures.
Typical use cases include assembling RC aircraft and drone frames (M3–M4), securing lightweight bicycle and cycling components (M4–M6), mounting electronics and camera equipment housings (M3–M5), and fastening aluminum extrusion panels and lightweight machinery guards (M5–M8) where reducing fastener weight is a design priority.
🔩 Compatible with standard ISO metric tapped holes and threaded inserts. Requires a Phillips (cross) screwdriver or bit — PH1 for M3–M4, PH2 for M5–M8, PH3 for M10.
✅ Key Features of These Aluminum Phillips Countersunk Machine Screws
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⚖️ Lightweight Aluminum Alloy Construction — Significantly lighter than steel fasteners, making these screws ideal for weight-sensitive applications in RC, aerospace models, cycling, and electronics.
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🛡️ Anodized Surface Treatment — Anodizing enhances corrosion and oxidation resistance, extending service life in both indoor and moderate outdoor environments.
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🔧 Phillips (Cross) Drive — Standard Phillips drive is compatible with widely available screwdrivers and power tool bits, making installation fast and straightforward.
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📐 Countersunk Flat Head Profile — Sits flush with or below the surface for a clean, snag-free finish on panels, frames, and enclosures — no protruding head to catch or interfere.
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📦 Wide Size Range — M3 to M10 — Covers the most common metric thread sizes for lightweight assemblies, with lengths from 6mm to 50mm to suit a broad range of material thicknesses.
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⚙️ Metric Standard, ±0.3mm Tolerance — Manufactured to GB metric standard with a ±0.3mm dimensional tolerance, ensuring consistent fit in standard metric tapped holes and threaded inserts.
📐 Technical Specifications — Aluminum Phillips Countersunk Flat Head Screws
| Material |
Aluminum Alloy |
| Surface Treatment |
Anodized (Natural Aluminum Color) |
| Head Type |
Countersunk Flat Head |
| Drive Style |
Phillips (Cross Drive) |
| Thread Standard |
ISO Metric / GB Standard |
| Thread Diameter Range |
M3 / M4 / M5 / M6 / M8 / M10 |
| Length Range |
6mm – 50mm (approx. 0.24" – 1.97") |
| Dimensional Tolerance |
±0.3mm |
| System of Measurement |
Metric |
| Pack Quantity Options |
5 / 10 / 20 / 50 / 100 pcs (varies by size) |
| Compatible Tools |
Phillips Screwdriver PH1 (M3–M4), PH2 (M5–M8), PH3 (M10) |
| Typical Applications |
RC aircraft, drones, bicycles, electronics, lightweight machinery |
❓ Frequently Asked Questions
What material are these screws made from?
These screws are made from aluminum alloy with an anodized surface treatment. Aluminum alloy provides a lightweight, corrosion-resistant fastener suitable for applications where weight reduction is important.
How do I choose the right screw size?
Select the thread diameter (M3–M10) to match your tapped hole or nut, and choose a length (6–50mm) that provides adequate thread engagement — typically at least 1.5× the thread diameter. For blind holes, ensure the screw length does not exceed the hole depth.
What tool do I need to drive these screws?
These screws use a Phillips (cross) drive. A standard Phillips screwdriver or Phillips bit in a power driver is required. Use the correct bit size to avoid cam-out: PH1 for M3–M4, PH2 for M5–M8, PH3 for M10.
Are aluminum screws as strong as steel screws?
Aluminum alloy screws are lighter than steel but have lower tensile strength. They are well-suited for lightweight assemblies, electronics, RC models, and applications where weight savings matter more than maximum load capacity. For high-load structural applications, steel fasteners are generally recommended.
Will the head sit flush when installed?
Yes. The countersunk flat head is designed to sit flush with or below the surface when installed in a properly countersunk hole. Ensure your workpiece is countersunk at the correct angle to match the head profile for a clean flush fit.
What is the tolerance range for these screws?
The dimensional tolerance range is ±0.3mm, which is standard for metric aluminum fasteners in this size range. This ensures consistent fit in standard metric tapped holes and threaded inserts.
What are typical applications for these screws?
Common applications include RC aircraft and drone frames, bicycle and cycling components, electronics and camera equipment housings, lightweight machinery panels, and any assembly where reducing fastener weight is a design priority.
How many screws are included per order?
Pack quantity varies by size: M3 comes in 100 pcs, M4 and M5 in 50 pcs, M6 in 20 pcs, M8 in 10 pcs, and M10 in 5 pcs. Select your thread diameter, length, and quantity from the options above before adding to cart.
🛒 Select your Thread Dia x Length and Amount above, then add to cart.
