🔩 Product Overview: Mini Countersunk Phillips Machine Screws – M1 to M4, Carbon Steel (4–12mm)
When you're repairing smartwatches, mobile phones, laptops, or other compact electronics, you need tiny screws that fit precisely and sit completely flush. These M1, M1.2, M1.4, M1.7, M2, M3, and M4 countersunk flat head Phillips machine screws are made from carbon steel with a corrosion‑resistant nickel or black zinc plating. The 90° flat head sinks perfectly into countersunk holes, leaving a smooth, snag‑free surface – ideal for PCB mounting, battery covers, and device enclosures. Fully threaded with standard coarse metric pitch, and available in lengths 4mm, 5mm, 6mm, 8mm, 10mm, and 12mm (measured including the head). Choose the finish and size that matches your repair or assembly project.
✨ Why These Mini Countersunk Screws Are a Precision Repair Essential
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High corrosion resistance – Nickel or black zinc plating effectively isolates air and moisture, preventing carbon steel from rusting. Suitable for humid or industrial environments.
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High mechanical strength – Carbon steel material offers high hardness and good tensile strength. Countersunk design provides flat installation and avoids bulging interference.
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Convenient installation – Phillips cross slot structure works with power tools or precision screwdrivers to enhance assembly efficiency.
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Wide micro size range: M1 to M4 – Includes M1, M1.2, M1.4, M1.7, M2, M3, and M4 – covering the smallest fasteners for smartwatches up to medium electronics.
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Multiple length options: 4, 5, 6, 8, 10, 12mm – Length is measured including the head for easy matching with original screws. Choose exactly what your device needs.
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Fully threaded, coarse metric pitch – Standard threads per size. Threads run the entire length for maximum grip.
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Wide application range – Electronics (smartwatches, phone motherboards, laptop casings), mechanical equipment (motor covers, control panels), automotive (ECU boxes, instrument brackets), furniture hardware (cabinet hinges, drawer slides).
📏 Technical Specifications – Mini Countersunk Phillips Screws (M1–M4)
| Specification |
Details |
| Product Name |
Countersunk Phillips Machine Screws (Miniature) |
| Material |
Carbon steel |
| Plating Options |
Nickel plated (bright silver) or Black zinc plated (matte dark) |
| Head Style |
Countersunk flat head (90°) |
| Drive Style |
Phillips cross‑head (use PH00 for M1–M2, PH0 for M3–M4) |
| System of Measurement |
Metric |
| Screw Sizes (Diameter) |
M1, M1.2, M1.4, M1.7, M2, M3, M4 |
| Thread Pitches (coarse) |
M1x0.25, M1.2x0.25, M1.4x0.3, M1.7x0.35, M2x0.4, M3x0.5, M4x0.7 |
| Thread Type |
Fully threaded |
| Length Options (including head) |
4mm, 5mm, 6mm, 8mm, 10mm, 12mm (select from options) |
| Length Measurement |
Length includes head (total screw length – standard for countersunk screws) |
📱 Recommended Sizes by Application
| Application |
Common Sizes |
Recommended Plating |
| Smartwatches / Mobile Phone Motherboards |
M1.4 – M3 |
Nickel or Black Zinc |
| Laptop Casings / PCB Mounting |
M2 – M3 |
Nickel or Black Zinc |
| Motor Covers / Control Panels |
M3 – M4 |
Nickel (rust‑proof) |
| ECU Boxes / Instrument Brackets |
M4 |
Black Zinc (vibration resistance) |
| Cabinet Hinges / Drawer Slides |
M4 |
Nickel or Black Zinc |
❓ FAQs – Mini 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 M2 x 8mm screw is 8mm long overall. This matches how original equipment manufacturers specify these tiny 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: M1x0.25, M1.2x0.25, M1.4x0.3, M1.7x0.35, M2x0.4, M3x0.5, M4x0.7.
🔸 Which finish should I choose – nickel or black zinc?
Nickel offers a bright silver finish with good corrosion resistance – great for general electronics and visible assemblies. Black zinc provides a dark, non‑reflective finish that blends with black PCBs, laptop interiors, and automotive parts. Both offer excellent protection against rust in humid environments.
🔸 What screwdriver size do I need for these tiny screws?
For M1 to M2, use a PH00 precision Phillips bit. For M3 to M4, a PH0 or PH1 works. Always use a high‑quality precision screwdriver to avoid stripping the small recess. Never use a worn or oversized bit.
🔸 Will the plating prevent rust in humid environments?
Yes – both nickel and black zinc plating effectively isolate the carbon steel from air and moisture, providing good corrosion resistance for indoor and industrial environments. For continuous saltwater or outdoor exposure, stainless steel would be a better choice.
🔸 What lengths are available for each diameter?
We offer lengths 4, 5, 6, 8, 10, and 12mm for all diameters. Not every length may be available for every size – please check the dropdown options. If you need a specific combination not listed, contact us.
