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You’re repairing a pair of glasses, mounting a small PCB, or assembling a miniature hinge – and you need tiny, rust‑proof screws that sit perfectly flush. These M2 and M2.5 countersunk machine screws are made from A2 stainless steel (304), so they won’t corrode indoors or out. The flat, 90° head sinks flush into a pre‑drilled countersink, leaving a smooth, snag‑free surface. Phillips drive works with standard crosshead screwdrivers. Available in overall lengths from 2mm to 60mm (including the head). Fully threaded for maximum grip. Perfect for electronics, model making, eyewear, and precision instrument repair.
| Thread Diameter | Overall Length (mm, including head) * | Thread Pitch (mm) | Head Diameter (approx., mm) | Head Height (mm) | Material |
|---|---|---|---|---|---|
| 📐 Overall length = from top of head to tip (total screw length). Fully threaded. Select exact size from dropdown. | |||||
| M2 | 2, 3, 4, 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60 | 0.4 | ~3.5‑3.8 | ~1.3 |
A2 304 Stainless |
| M2.5 | 2, 3, 4, 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60 | 0.45 | ~4.4‑4.7 | ~1.5 | |
* Lengths are typical – exact availability may vary. Please allow minor manual measurement errors. Head dimensions are approximate based on standard DIN/ISO countersunk head geometry.
| Thread Size | Pitch (mm) | Head Diameter (mm) | Head Height (mm) | Material | Finish |
|---|---|---|---|---|---|
| M2 | 0.4 | 3.5 – 3.8 | 1.3 | A2 stainless |
Natural |
| M2.5 | 0.45 | 4.4 – 4.7 | 1.5 |
1. How do I measure the length of a countersunk screw?
For countersunk (flat head) screws, the length is measured overall – from the top of the head to the tip. So an “M2 x 5mm” screw has a total length of 5mm including the head. This is different from pan head screws, which are measured under the head.
2. Do I need to countersink the hole for these screws to sit flush?
Yes – these are true 90° countersunk screws. For the head to be flush (or slightly recessed), you must drill a matching 90° countersink hole. Use a countersink bit slightly larger than the head diameter. In very soft materials like plastic or thin wood, you can sometimes tap the head in, but proper countersinking gives the best result.
3. Are these screws fully threaded?
Yes – all M2 and M2.5 screws in this range are fully threaded from under the head to the tip. This gives you maximum grip even in shallow holes.
4. Can I use these screws outdoors? Will they rust?
A2 stainless (304) is highly corrosion‑resistant and suitable for outdoor use in most environments – including humidity, rain, and coastal areas. For continuous saltwater immersion, A4 (316) is better, but for general outdoor electronics, garden equipment, and furniture, A2 is excellent and will not rust.
5. What Phillips screwdriver size do I need for M2 and M2.5 screws?
For M2 screws, use a #000 or #00 Phillips. For M2.5, a #0 works well. Precision screwdriver sets typically include these small sizes. Always match the bit snugly to avoid slipping or damaging the recess.
6. Can I use these screws with a nut? What size nut fits?
Yes – these are machine screws. Use standard metric nuts: M2 nut (0.4mm pitch) or M2.5 nut (0.45mm pitch). They will also thread into pre‑tapped holes of the same size. They are not self‑tapping; for wood or plastic, drill a pilot hole and use a nut or threaded insert.
