🔩 Product Overview: Phillips Countersunk Machine Screws – Nickel / Black Zinc Plated (M4, M5, M6)
Need a fastener that sits flush with the surface and offers a choice of finishes to match your project? These M4, M5, and M6 Phillips countersunk flat head machine screws are made from carbon steel with your choice of nickel or black zinc plating. The 90° flat head sinks perfectly into countersunk holes, leaving a smooth, snag‑free finish – ideal for furniture, appliances, electronics, and automotive trim. Nickel plating provides a bright, silver appearance with good corrosion resistance, while black zinc offers a dark, non‑reflective finish for stealthy assemblies. Fully threaded with standard coarse metric pitch, and length is measured including the head for easy matching. Available in lengths from 5mm to 50mm. Choose the finish that suits your style.
✨ Why These Countersunk Phillips Screws Deserve a Spot in Your Hardware Drawer
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Two finish options – nickel or black zinc – Nickel offers a bright, polished silver look with corrosion resistance. Black zinc provides a dark, matte finish that blends with black equipment and trim.
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Carbon steel construction – Strong and durable for most indoor and light outdoor fastening applications. Reliable Grade 4.8 strength.
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Phillips countersunk flat head – Sits flush in tapered holes for a smooth, snag‑free, professional finish.
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Metric sizes M4, M5, M6 – Versatile diameters for furniture, machinery, automotive, and electronics projects.
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Lengths from 5mm to 50mm (including head) – Short screws for thin panels, longer ones for through‑hole assemblies. Choose exactly what you need.
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Fully threaded, coarse metric pitch – Standard threads: M4x0.7, M5x0.8, M6x1.0. Threads run the entire length for maximum grip.
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Wide application range – Furniture, appliances, electronics, automotive trim, machinery, and general DIY.
📏 Technical Specifications – Countersunk Phillips Screws (M4–M6)
| Specification |
M4 |
M5 |
M6 |
| Thread Diameter (d) |
4.0mm |
5.0mm |
6.0mm |
| Thread Pitch (p) |
0.7mm |
0.8mm |
1.0mm |
| Head Diameter (dk) min–max |
7.1 – 7.6mm |
8.5 – 8.9mm |
10.5 – 11.2mm |
| Head Thickness (k) |
2.6mm |
3.1mm |
3.6mm |
| Head Style |
Countersunk flat head (90°) |
| Drive Style |
Phillips (use PH2 bit) |
| Material |
Carbon steel |
| Available Finishes |
Nickel plated (bright silver) or Black zinc plated (matte dark) |
| Thread Type |
Fully threaded, coarse pitch |
| Length Measurement |
Length includes head (total screw length) |
| Length Range |
5mm – 50mm (select from options) |
❓ FAQs – Nickel / Black Zinc Countersunk Screws
🔸 How is length measured for these countersunk screws?
For countersunk screws, length is measured as total screw length including the head – from the top of the flat head to the tip. For example, an M5 x 20mm screw is 20mm long overall. This matches common fastener standards and makes it easy to replace existing screws.
🔸 Are these screws fully threaded? What pitch do they have?
Yes, all screws are fully threaded from under the head to the tip. They use standard metric coarse pitches: M4x0.7, M5x0.8, M6x1.0.
🔸 Which finish should I choose – nickel or black zinc?
Nickel offers a bright, silver appearance that matches most standard hardware – great for appliances, electronics, and general use. Black zinc provides a dark, non‑reflective finish that blends with black panels, automotive trim, or stealth builds. Both offer good corrosion resistance for indoor use.
🔸 Will the plating rust or wear off?
Both nickel and black zinc provide good corrosion resistance for indoor and light outdoor use. With repeated driving, the recess may show some wear, but the finish holds up well for furniture, appliances, and automotive trim. For constant moisture or saltwater, use stainless steel.
🔸 What Phillips screwdriver size works for M4, M5, and M6?
M4 uses PH1 or PH2 (PH2 works well). M5 and M6 use PH2. Using the correct size prevents stripping. A quality PH2 bit will handle all three sizes comfortably.
🔸 What lengths are available for M4, M5, and M6?
We offer lengths from 5mm to 50mm. Typical increments: 5, 6, 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 45, 50mm. Please select your desired length from the dropdown options. If you need a length not listed, contact us.
