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You’re assembling a marine electrical panel, mounting hardware on a coastal structure, or working on a project where a flush finish and high torque matter. These M3 to M8 countersunk screws feature a Torx (six‑lobe) drive, which virtually eliminates cam‑out and lets you apply serious torque without damaging the recess. Made from A2 stainless steel (304), they resist corrosion in outdoor, humid, and light marine environments. The flat, countersunk head sits flush with the surface after pre‑drilling a 90° countersink, leaving a smooth, professional finish. Available in M3, M4, M5, M6, and M8 diameters with lengths from 4mm to 60mm (measured overall including the head). Fully threaded for maximum grip. Perfect for boat fittings, industrial equipment, automotive trim, and any application where a secure, low‑profile fastener is needed.
| Thread Diameter | Overall Length (mm, including head) * | Thread Pitch (mm) | Head Style | Drive | Material |
|---|---|---|---|---|---|
| 📐 Length = from top of head to tip (total screw length). Fully threaded. Select exact size from dropdown. | |||||
| M3 | 4, 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 60 | 0.5 |
Countersunk (DIN 965) |
Torx / Six‑lobe |
A2 304 Stainless |
| M4 | 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 60 | 0.7 | |||
| M5 | 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 60 | 0.8 | |||
| M6 | 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 60 | 1.0 | |||
| M8 | 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 60 | 1.25 | |||
* Overall length includes the head. All screws are fully threaded. Lengths are typical – exact availability may vary by diameter. Please allow minor manual measurement errors. Torx bit size varies: M3 (T8), M4 (T10), M5 (T15), M6 (T20), M8 (T25) approx.
| Feature | Benefit |
|---|---|
| No cam‑out | Torx geometry keeps the bit fully engaged, even under high torque – no slipping out and damaging the screw or workpiece. |
| Even force distribution | The six lobes spread stress evenly, reducing wear on both the driver bit and the screw recess. |
| High torque capability | Ideal for power tools and applications where you need to tighten firmly without stripping. |
| DIN 965 compliance | Standardized head dimensions ensure consistent fit and interchangeable with other DIN 965 Torx screws. |
1. Why choose Torx over Phillips or slotted?
Torx (six‑lobe) drive virtually eliminates cam‑out – the bit doesn’t slip out under high torque. This means you can drive screws faster and tighter without damaging the screw head. Torx also distributes force evenly, reducing wear. For power tool assembly or applications where you need consistent torque, Torx is superior.
2. How do I measure the length of these countersunk screws?
For countersunk screws (DIN 965), the length is measured overall – from the very top of the head to the tip. So an “M5 x 10mm” screw has a total length of 10mm including the head. This is standard for flat head screws. If you need a screw with a 10mm threaded portion under the head, choose a longer overall length (e.g., M5 x 12mm).
3. Do I need to countersink the hole for these screws to sit flush?
Yes – these are true countersunk screws with a 90° cone head. To achieve a flush or slightly recessed finish, you must drill a matching 90° countersink hole. Use a countersink bit slightly larger than the screw head. In softer materials, you can sometimes tap the head in, but proper countersinking gives a professional result.
4. What Torx bit size do I need for each screw?
Approximate matching: M3 uses T8, M4 uses T10, M5 uses T15, M6 uses T20, M8 uses T25. Always use a Torx bit that fits snugly without wobbling to avoid stripping the recess.
5. Are these screws suitable for outdoor or marine use?
A2 stainless (304) is highly corrosion‑resistant and works well outdoors, including coastal areas. For continuous saltwater immersion (e.g., below deck or underwater fittings), we recommend A4 (316) stainless. For most above‑water marine hardware, garden furniture, and outdoor signs, A2 is excellent and will not rust.
6. Are these screws fully threaded?
Yes – all M3 to M8 screws in this range (up to 60mm overall length) are fully threaded from under the head to the tip. This gives you maximum grip in shallow holes or through‑nut applications.
