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You’re working on a project where every screw needs to sit flush, and you’re tired of Phillips drivers slipping at the last moment. These Torx countersunk screws give you the best of both worlds: a flush‑finish flat head and a six‑lobe drive that won’t cam out. Made from A2 stainless steel (304), they resist rust in outdoor, marine, and humid environments. The 90° flat head sinks perfectly into a pre‑drilled countersink, leaving a smooth surface. Available in M2.5, M3, and M4 diameters, with overall lengths from 4mm to 20mm (including the head). Fully threaded and ready for power tools or hand drivers. Ideal for marine hardware, electronic enclosures, furniture, and any application where a secure, low‑profile fastener is a must.
| Thread Diameter | Overall Length (mm, including head) * | Thread Pitch (mm) | Head Style | Drive | Material |
|---|---|---|---|---|---|
| 📐 Overall length = from top of head to tip. Fully threaded. Select exact size from dropdown. | |||||
| M2.5 | 4, 5, 6, 8, 10, 12, 14, 16, 20 | 0.45 |
Countersunk / Flat (90°) |
Torx (hexalobular) |
A2 304 Stainless |
| M3 | 4, 5, 6, 8, 10, 12, 14, 16, 20 | 0.5 | |||
| M4 | 4, 5, 6, 8, 10, 12, 14, 16, 20 | 0.7 | |||
* Overall length includes the head. All screws are fully threaded. Exact dimensions may vary slightly; see photo gallery for detailed tolerances. Torx bit sizes: M2.5 → T8, M3 → T10, M4 → T20 (approx.).
| Feature | Benefit |
|---|---|
| No cam‑out | The straight, parallel walls of the Torx recess keep the bit fully engaged, even under high torque – no slipping. |
| High torque capacity | Ideal for power tools and applications where you need to tighten firmly without stripping the head. |
| Longer tool life | Even force distribution reduces wear on both the screw recess and your driver bits. |
| A2 stainless | Corrosion resistant, non‑magnetic, strong – perfect for marine, outdoor, and industrial use. |
1. How do I measure the length of a countersunk screw?
For countersunk screws, the length is measured overall – from the top of the head to the tip. So an “M3 x 8mm” screw has a total length of 8mm including the head. This matches our listing.
2. Do I need to countersink the hole for these screws to sit flush?
Yes – these are true 90° countersunk screws. To achieve a flush finish, drill a matching 90° countersink hole. Use a countersink bit slightly larger than the head diameter.
3. Are these screws fully threaded?
Yes – all screws in this range (up to 20mm overall length) are fully threaded from under the head to the tip, giving you maximum grip.
4. What Torx bit size do I need for each screw?
Approximate matching: M2.5 uses T8, M3 uses T10, M4 uses T20. Always use a quality Torx bit that fits snugly to avoid stripping the recess.
5. Can I use these screws outdoors or in saltwater?
A2 stainless (304) is highly corrosion‑resistant and suitable for outdoor, coastal, and freshwater marine use. For continuous saltwater immersion, A4 (316) is better, but for most outdoor DIY, marine hardware above waterline, and furniture, A2 is excellent.
6. Can I use these screws with a nut? What size nut fits?
Yes – these are machine screws. Use standard metric nuts of the same thread size (M2.5, M3, or M4 nut). They will also thread into pre‑tapped holes. Not self‑tapping – for wood or plastic, use a threaded insert or nut.
