⚫ M2–M6 Countersunk Phillips Machine Screws – Black Zinc Plated Steel, Fully Threaded (Overall Length Includes Head)
You’re assembling outdoor furniture, mounting black‑anodised aluminium panels, or working on a project where dark hardware blends in – and you need screws that won’t stand out or rust quickly. These M2 to M6 countersunk screws are made from carbon steel with a matte black zinc plating. The flat, 90° head sinks flush into a pre‑drilled countersink, leaving a smooth, low‑profile finish. The Phillips drive works with standard crosshead screwdrivers. Fully threaded, with length measured overall including the head. Available in M2, M2.5, M3, M4, M5, and M6 diameters, with lengths from 3mm to 50mm. Perfect for furniture, machine guards, electronic enclosures, and any assembly where a flush, dark fastener is desired.
✨ Key Features – Black Zinc Countersunk Phillips Screws
- ⚫ Matte black zinc finish – Low‑glare, professional appearance. Provides moderate corrosion resistance for indoor and light outdoor use.
- 🔽 Countersunk flat head (90°) – Sits flush with the surface after proper countersinking. Smooth, snag‑free finish.
- 🔧
Phillips drive – Standard cross recess fits common screwdrivers. Good torque transfer for reliable fastening.
- 💪 Carbon steel construction – Strong and durable. Black zinc plating adds a layer of rust protection.
- 📏 Metric sizes M2, M2.5, M3, M4, M5, M6 – Popular diameters for furniture, electronics, machinery, and DIY.
- 📐 Overall length includes head (3–50mm) – Example: M4 x 10mm means total length from top of head to tip is 10mm. Fully threaded.
- 🔧 Widely used – Furniture assembly, machinery guards, black‑finished enclosures, automotive trim, and general repairs.
📏 Specifications – M2 to M6 Black Countersunk Screws (Overall Length Includes Head)
| Thread Diameter (M) |
Thread Pitch (mm) |
Head Diameter (dk) – mm |
Head Height (k) – mm |
Typical Overall Lengths (mm) * |
Material / Finish |
| M2 |
0.4 |
3.5–3.8 |
1.3 |
3, 4, 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50
(exact availability varies) |
Carbon steel / Black zinc plated |
| M2.5 |
0.45 |
4.4–4.7 |
1.5 |
| M3 |
0.5 |
5.2–5.5 |
1.7 |
| M4 |
0.7 |
7.1–7.6 |
2.6 |
| M5 |
0.8 |
8.5–8.9 |
3.1 |
| M6 |
1.0 |
10.5–11.2 |
3.6 |
* Overall length = from top of head to tip. All screws fully threaded. Head dimensions based on standard countersunk geometry. Please allow minor manual measurement errors.
📋 Why Black Zinc Plated Countersunk Screws?
| Property |
Benefit |
| Black zinc finish |
Matte black, low‑glare appearance that blends with dark surfaces. Adds moderate corrosion resistance for indoor and light outdoor use. |
| Countersunk head |
Flush fit prevents snagging – ideal for sliding mechanisms, machine covers, and finished furniture. |
| Phillips drive |
Easy to install with common tools. Standard recess for reliable torque transfer. |
| Fully threaded |
Maximum thread engagement in blind holes or through‑nut applications. |
❓ Frequently Asked Questions – Black 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 “M4 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. To achieve a flush or slightly recessed finish, you must drill a matching 90° countersink hole. Use a countersink bit of the appropriate size.
3. Are these screws fully threaded?
Yes – all M2 to M6 screws in this range are fully threaded from under the head to the tip, giving you maximum grip in blind holes or when using nuts.
4. Will the black zinc finish rust? Can I use these screws outdoors?
Black zinc provides moderate corrosion resistance – fine for indoor use and occasional light outdoor exposure (e.g., covered patio or garage). For continuous outdoor or marine environments, we recommend stainless steel. For most furniture, electronics, and workshop projects, black zinc is perfectly adequate.
5. What Phillips screwdriver size do I need for M2–M6?
For M2–M2.5: #000 or #00. M3–M4: #0 or #1. M5–M6: #2. Always use a 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., M4 nut for M4 screw). For outdoor use, pair with black zinc or stainless nuts.
