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Protruding screw heads snag on surfaces, add unnecessary weight, and ruin the clean lines of precision builds — a real problem in aerospace models, high-end bicycle frames, and mechanical equipment where a flush, low-profile fastener is required. These anodized aluminum M4 countersunk flat head screws sit flush with or below the surface of the material, delivering a clean, aerodynamic profile with the strength and corrosion resistance of aluminum alloy in 9 vibrant anodized colors.
Machined from high-strength aluminum alloy with an anodized surface treatment, each screw features a flat countersunk head with an internal Allen (hex socket) drive for precise torque application with a standard hex key. The tapered underside of the head seats into a countersunk hole, pulling the head flush with the surface for a clean, low-profile finish. Available in 9 anodized colors — Dark Red, Rose Red, Golden, Royal Blue, Sky Blue, Black, Silver, Green, and Purple — and thread lengths from 6mm to 30mm (M4 thread). Tolerance: ±0.3mm.
These M4 aluminum countersunk screws are widely used in aerospace industry components, aviation and RC model toy accessories, high-end aluminum alloy bicycle frames, golf club heads, mechanical equipment, mold processing, computer accessories, and general DIY precision builds where a lightweight, corrosion-resistant, color-matched flush-mount fastener is required.
Ideal for aerospace industry components, aviation model toy accessories, and RC builds where lightweight, color-matched flush-mount countersunk screws are needed for panel fastening, frame assembly, and aerodynamic surface finishing.
Used in high-end aluminum alloy bicycle frames and golf club head assembly where lightweight, corrosion-resistant countersunk screws with a flush-mount profile are needed for both structural performance and a clean, professional finish.
Suitable for mechanical equipment assembly, mold processing, and computer accessories where precise, flush-mount M4 countersunk fasteners with consistent tolerances are required for clean surface finishes and interference-free component clearances.
Perfect for any DIY precision build, custom enclosure, or fabrication project where a lightweight, anodized color-matched countersunk screw adds both structural function and a clean, flush visual finish to the completed piece.
| Material | Aluminum Alloy (Anodized) |
|---|---|
| Thread Size | M4 |
| Head Style | Countersunk (Flat Head — flush-mount, tapered underside) |
| Drive Style | Allen (Hex Socket / Internal Hex) |
| Available Lengths | 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 25mm, 30mm |
| Available Colors | Dark Red, Rose Red, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple (anodized) |
| Surface Treatment | Anodizing |
| Tolerance | ±0.3mm |
| Typical Applications | Aerospace models, RC toys, bicycle frames, golf club heads, mechanical equipment, mold processing, computer accessories, DIY precision builds |
A countersunk screw has a flat, tapered head designed to sit flush with or below the surface of the material when installed in a matching countersunk hole. A socket cap screw has a raised cylindrical head that sits above the surface. These are countersunk flat head screws — they are designed for flush-mount applications where a protruding head would be undesirable.
These countersunk screws are M4 metric thread. They are available in 10 thread lengths: 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 25mm, and 30mm. Select your preferred color and length from the variant options above.
These screws use an Allen (hex socket / internal hex) drive. A standard M4 hex key (Allen key) is required for installation. The internal hex drive allows precise torque application and reduces the risk of cam-out compared to Phillips or slotted drives.
Yes. Countersunk screws require a matching countersunk (chamfered) hole in the material to allow the tapered head to seat flush with the surface. A standard countersink drill bit at the appropriate angle (typically 90°) is used to create the countersunk recess before installing the screw.
Yes. Aluminum alloy is significantly lighter than steel — typically about one-third the weight for the same volume. This makes these screws well-suited for weight-sensitive applications such as RC models, aviation accessories, and bicycle frames where reducing fastener weight contributes to overall performance.
The anodized finish is integrated into the surface of the aluminum rather than applied as a paint or coating, making it generally more resistant to fading and chipping than painted alternatives under normal use conditions.
These M4 countersunk screws are manufactured to a tolerance of ±0.3mm on thread length and head dimensions, ensuring consistent fit across standard M4 countersunk holes in aluminum, composite, and plastic components.
