Phillips Countersunk Machine Screws DIN 965 | 6063 Aluminum | M1.7–M6

A general rule is to select a length that allows the screw to penetrate the base material by at least 2× the screw diameter. For example, an M3 screw fastening a 3mm panel into aluminum extrusion would typically need at least 6mm of thread engagement — so M3 × 10mm (≈3/8") or longer is a safe starting point. When countersinking flush, account for the head depth as well.

6063 aluminum alloy generally has a tensile strength of around 145–186 MPa and a yield strength of approximately 110–145 MPa. These screws are well-suited for light-to-medium clamping loads in electronics enclosures, panels, and frames. For high-shear or structural applications, stainless steel fasteners are typically recommended.

6063 aluminum has good natural corrosion resistance due to its oxide layer, making it generally suitable for outdoor environments. However, in salt-spray or marine conditions, galvanic corrosion can occur if the screws contact dissimilar metals (e.g., steel). For harsh marine environments, anodized aluminum or stainless steel fasteners are typically preferred.

These screws conform to DIN 965 (ISO 7046 equivalent), which specifies metric coarse thread (M profile) with a 90° countersunk Phillips head. They are compatible with standard metric tapped holes and metric nuts across M1.7, M2, M2.5, M3, M4, M5, and M6 sizes.

Aluminum screws are significantly lighter than stainless steel — typically about 65% lighter by weight — which matters in weight-sensitive applications like drones, RC cars, camera rigs, and laptop enclosures. They are also non-magnetic and thermally conductive, making them a practical choice where steel fasteners would add unnecessary mass or interfere with sensors.

Yes. Phillips countersunk screws are commonly used in plastic enclosures, acrylic panels, and composite sheets when paired with the correct tapped hole or heat-set insert. The 90° countersunk head sits flush with the surface for a clean finish. Avoid overtightening in soft plastics, as aluminum threads can strip more easily than steel under excessive torque.

Phillips head size generally corresponds to screw diameter: PH0 is typically used for M1.7–M2, PH1 for M2.5–M3, and PH2 for M4–M6. Using the correct bit size reduces cam-out and protects the soft aluminum head from stripping.