🔩 Product Overview: M3 Phillips Umbrella Round Head Machine Screws – Carbon Steel / 304 Stainless (4–10mm)
These M3 Phillips machine thread screws feature a unique spherical center post head (often called umbrella or dome head) that provides a wider, lower bearing surface than standard pan head screws. Ideal for applications where you need to distribute clamping force evenly across soft materials like plastic, wood, or thin sheet metal. Made from high‑quality carbon steel (heat‑treated for strength) or 304 stainless steel, with a wide range of plated finishes (black zinc, nickel, white zinc, blue zinc, black nickel, and anti‑loosening rubber coated options). Fully threaded with standard M3 coarse pitch (0.5mm), available in lengths from 4mm to 10mm (measured under the head). Perfect for electronics, automotive, medical devices, precision instruments, and general assembly.
✨ Why These M3 Umbrella Head Screws Are a Versatile Fastening Solution
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Spherical center post (umbrella / dome) head – Wide, low‑profile head distributes clamping force evenly, preventing pull‑through in soft materials. Provides a clean, finished look.
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Choice of materials – carbon steel or 304 stainless steel – Carbon steel (heat‑treated) offers high strength at a lower cost. 304 stainless provides natural corrosion resistance for harsh environments.
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Multiple surface finishes available – Black zinc, nickel‑plated, white zinc, blue zinc, black nickel, and anti‑loosening rubber coated versions. Select to match your application or aesthetic.
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Phillips drive – Standard cross recess works with PH0 or PH1 bits. Easy to install with manual or power tools.
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M3 metric size – fully threaded – Standard coarse pitch (0.5mm). Threads run the entire length for maximum grip in thin materials.
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Lengths from 4mm to 10mm (under head) – Available in 4, 5, 6, 7, 8, 9, 10mm. Choose exactly what your project needs.
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Wide application range – Machinery manufacturing, electronic equipment (shells, panels), aerospace, precision instruments, medical devices, automotive (seats, dashboards, door trim), construction, toys, wood/plastic connections, and telecommunications.
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Durable and long‑lasting – High strength, corrosion resistance, wear resistance, and anti‑rust properties ensure reliable performance.
📏 Technical Specifications – M3 Umbrella Head Phillips Screws
| Specification |
Details |
| Thread Diameter (d) |
M3 (3mm) |
| Thread Pitch (p) |
0.5mm (standard coarse) |
| Thread Length Range |
4mm – 10mm (under head – head not included) |
| Head Diameter (dk) range |
5mm – 7mm (depends on length and finish) |
| Head Thickness (k) range |
1.4mm – 2.2mm |
| Head Style |
Spherical center post head (umbrella / dome) |
| Drive Style |
Phillips cross‑head (use PH0 or PH1) |
| Material Options |
Carbon steel (heat‑treated) or 304 Stainless Steel |
| Available Finishes (Carbon Steel) |
Black zinc, nickel‑plated, white zinc, blue zinc, black nickel, plus anti‑loosening rubber versions |
| Available Finishes (304 Stainless) |
Natural (unplated) or with anti‑loosening rubber |
| Thread Type |
Fully threaded, coarse metric |
| Tolerance |
±0.3mm |
❓ FAQs – M3 Umbrella Head Phillips Screws
🔸 What is the advantage of the spherical center post (umbrella) head design?
The umbrella head (also called dome or spherical head) has a wider diameter and lower profile than a standard pan head. This distributes clamping force over a larger area, reducing the risk of pulling through soft materials like plastic, wood, or thin metal. It also provides a clean, finished appearance that looks professional on visible assemblies.
🔸 Are these screws fully threaded? How is length measured?
Yes – they are fully threaded from just under the head to the tip. Length is measured from the underside of the head (the flat bearing surface) to the tip, not including the umbrella head. For example, an M3 x 8mm screw has an 8mm threaded shank.
🔸 Which finish should I choose for my application?
Black zinc and black nickel offer a dark, matte finish – great for black equipment or automotive trim. Nickel‑plated provides a bright, polished silver look. White zinc and blue zinc offer bright silver with slight color tints. For maximum corrosion resistance without plating, choose 304 stainless natural (silver). Anti‑loosening rubber coated versions are ideal for high‑vibration environments.
🔸 What Phillips screwdriver size works for M3 screws?
Use a PH0 or PH1 Phillips bit. PH0 provides better engagement for shorter screws. A quality precision screwdriver with a sharp tip is recommended to avoid stripping.
🔸 Can I use these screws with nuts, or are they self‑tapping?
These are standard machine screws – they require a matching M3 metric nut or a pre‑tapped hole. They are not self‑tapping. For best results, pair with steel, stainless, or brass nuts of the same thread size.
🔸 What is the anti‑loosening rubber coating?
The anti‑loosening rubber (pre‑applied patch) is a coating on the threads that adds friction, preventing the screw from vibrating loose. It is ideal for applications with movement or vibration, such as automotive, machinery, or electronics with cooling fans.
