🔩 M2 & M3 Countersunk Pozidriv Machine Screws – Carbon Steel, Nickel or Black Zinc (3–22mm Overall Length)
You’re fixing a computer case, mounting a hard drive, or repairing a piece of small machinery – and you need a screw that sits flush, drives securely, and doesn’t rust. These M2 and M3 countersunk screws are made from carbon steel with a choice of bright nickel or black zinc plating. The Pozidriv (Pozi) cross recess gives you a tighter bit fit and reduces cam‑out compared to standard Phillips. The flat 90° head sinks perfectly into a pre‑drilled countersink, leaving a smooth, professional surface. Available in lengths from 3mm to 22mm (overall including head), with fully threaded bodies. Optional black zinc with glue patch (pre‑applied thread locking) for vibration‑resistant applications. Ideal for computer hardware, electric toys, model making, furniture, and general DIY.
✨ Key Features – Countersunk Pozidriv Machine Screws
- 🔽 Countersunk flat head (90°) – Sits flush with the surface after proper countersinking. Clean, snag‑free finish.
- 📏
Pozidriv (Pozi) drive – Improved cross recess reduces cam‑out and allows higher torque than standard Phillips.
- ⚙️ Carbon steel construction – Strong and durable. Surface treatments: bright nickel (good corrosion resistance) or black zinc (matte, moderate protection).
- 🧪 Optional glue patch (NYLOK style) – Pre‑applied thread locking patch prevents loosening from vibration. Available on select black zinc lengths.
- 📏 Metric sizes M2 and M3 – Two of the most common small diameters for electronics, computers, and light machinery.
- 📐 Overall lengths from 3mm to 22mm (including head) – Example: M3 x 10mm means total length from top of head to tip is 10mm. Fully threaded.
- 🔧 Widely used – Computer cases, side panels, hard drives, optical drives, network/graphics/sound cards, electric toys, motorcycles, locomotives, fishing gear, furniture, and DIY modifications.
📏 Available Sizes & Finishes – M2 & M3 Countersunk Screws (Overall Length)
| Thread Diameter (M) |
Thread Pitch (mm) |
Overall Length Range (mm) * |
Finish Options |
Special Feature |
| 📐 Length measured from top of head to tip. Fully threaded. Select exact size and finish from dropdown. |
| M2 |
0.4 |
3, 3.5, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 16, 22 |
Bright nickel / Black zinc |
Black zinc with glue patch available on selected lengths (4,6,13mm) |
| M3 |
0.5 |
5, 6, 7, 8, 10, 12, 16, 20 |
Bright nickel / Black zinc |
Black zinc with glue patch available on 20mm length |
* Lengths shown are typical – exact availability may vary. Please allow minor manual measurement errors. Glue patch (thread locking) is pre‑applied and helps prevent loosening due to vibration.
📋 Which Finish and Feature Should You Choose?
| Finish / Feature |
Appearance |
Corrosion Resistance |
Best For |
| Bright nickel |
Shiny silver, bright |
Good – indoor use, light moisture |
Computer components, visible fasteners, electronics |
| Black zinc |
Matte black, low glare |
Moderate – indoor, light moisture |
Dark‑coloured chassis, industrial equipment, furniture |
| Black zinc + glue patch (NYLOK) |
Matte black with coloured patch on threads |
Same as black zinc + vibration resistance |
High‑vibration applications (motors, vehicles, power tools) |
❓ Frequently Asked Questions – Countersunk Pozidriv Screws
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 10mm” screw has a total length of 10mm 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. Drill a matching 90° countersink hole for a flush finish. Use a countersink bit slightly larger than the head diameter.
3. Are these screws fully threaded? What about longer lengths?
Yes – all M2 and M3 screws in this range (up to 22mm) are fully threaded from under the head to the tip, giving you maximum grip in blind holes or when using nuts.
4. What’s the difference between Pozidriv and Phillips? Can I use a Phillips driver?
Pozidriv (Pozi) has additional small ribs between the cross arms, providing better bit engagement and reduced cam‑out. A Phillips driver will fit, but for best results, use a Pozi bit (marked PZ). For M2 and M3, use PZ0 or PZ1.
5. Will the glue patch (thread locking) affect installation? Can I remove it if needed?
The patch adds friction but does not permanently lock the screw. You can install and remove them normally with a screwdriver. They are reusable several times before the patch wears. Ideal for preventing loosening from vibration.
6. Can I use these screws with a nut? What size nut fits?
Yes – these are machine screws. Use standard M2 or M3 metric nuts (0.4mm and 0.5mm pitch respectively). For computer cases, they often thread directly into tapped holes.
