🔩 M1–M3.5 Phillips Countersunk Machine Screws – 304 Stainless Steel, Fully Threaded (3–120mm Overall Length)
You’re repairing a small electronic device, assembling a precision instrument, or working on a delicate model – and you need a tiny countersunk screw that sits flush, drives easily, and won’t rust. These M1 to M3.5 flat head screws are made from 304 stainless steel (A2), offering excellent corrosion resistance for humid and light outdoor environments. The Phillips drive works with precision crosshead screwdrivers, and the 90° head sinks perfectly into a pre‑drilled countersink, leaving a smooth, professional surface. Available in diameters M1, M1.2, M1.4, M1.6, M2, M2.5, M3, and M3.5, with overall lengths from 3mm to 120mm (including the head). Fully threaded for maximum grip. Ideal for electronics, home appliances, communication equipment, ship assembly, and small repairs.
✨ Key Features – Micro Countersunk Phillips Screws (304 Stainless)
- 🔽 Countersunk flat head (90°) – Sits flush with the surface after proper countersinking. Smooth, snag‑free finish.
- 💪
Phillips drive – Standard cross recess works with precision screwdrivers (#000, #00, #0). Good torque control.
- 🛡️ 304 stainless steel (A2) – Excellent corrosion resistance, oxidation resistance, and durability. Won’t rust in humid or light outdoor environments.
- 📏 Wide metric range M1, M1.2, M1.4, M1.6, M2, M2.5, M3, M3.5 – Covers micro‑electronics to light precision machinery.
- 📐 Overall lengths 3–120mm (including head) – Example: M2 x 6mm means total length from top of head to tip is 6mm. Fully threaded.
- 💪 Good mechanical properties – Precision threads, smooth surface, burr‑free. Long service life, even in humid environments.
- 🔧 Widely used – Home and office appliances, communication equipment, ship assembly, mechanical industry, furniture, and DIY repairs.
📏 Specifications – M1 to M3.5 Countersunk Phillips Screws (304 Stainless)
| Thread Diameter (M) |
Thread Pitch (mm) |
Overall Length Range (mm) * |
Head Style |
Drive |
Material |
| 📐 Length measured from top of head to tip (total screw length). Fully threaded. Select exact size from dropdown. |
| M1 |
0.25 |
3, 4, 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90, 100, 110, 120
(exact availability varies) |
Countersunk / flat (90°) |
Phillips |
304 Stainless Steel (A2) |
| M1.2 |
0.25 |
| M1.4 |
0.3 |
| M1.6 |
0.35 |
| M2 |
0.4 |
| M2.5 |
0.45 |
| M3 |
0.5 |
| M3.5 |
0.6 |
* Lengths are typical – exact availability may vary. Please allow minor manual measurement errors. Fully threaded for maximum grip.
📋 Why 304 Stainless Steel for Micro Countersunk Screws?
| Property |
Benefit |
| Corrosion resistance |
Excellent for indoor, humid, and light outdoor use. Ideal for home appliances, marine‑adjacent, and communication equipment. |
| Strength & durability |
High tensile strength, good oxidation resistance. Long service life without deformation. |
| Precision threads |
Smooth surface, burr‑free, even pitch – ensures consistent tightening and protects equipment. |
| Flush finish |
Countersunk head sits flush – perfect for sliding mechanisms, covers, and safety‑critical assemblies. |
❓ Frequently Asked Questions – Micro Countersunk Phillips 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 “M2 x 6mm” screw has a total length of 6mm 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. For a flush finish, drill a matching 90° countersink hole. For very small sizes (M1–M2), use a tiny countersink bit or carefully use a larger drill bit.
3. Are these screws fully threaded? What about longer lengths like 120mm?
Yes – all M1 to M3.5 screws in this range (up to 120mm) are fully threaded from under the head to the tip, giving you maximum grip in blind holes or through‑nut applications.
4. Can I use these screws outdoors? Will they rust?
304 stainless steel is highly corrosion‑resistant and suitable for outdoor use in most environments – rain, humidity, and coastal areas. For continuous saltwater immersion, consider 316 stainless, but for general outdoor electronics and furniture, 304 is excellent.
5. What Phillips screwdriver size do I need for M1–M3.5?
For M1–M1.6: #000 or #00. M2–M2.5: #0. M3–M3.5: #0 or #1. Always use a precision driver that fits snugly to avoid cam‑out and head damage.
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 (e.g., M2 nut for M2 screw). For very small diameters, we recommend tapping the hole directly for a secure fit.
