Phillips Umbrella Head Machine Screws — Reliable Fastening for Thin Materials & Panels
When a standard pan head screw just doesn't have enough bearing surface — and your plastic panel, thin sheet metal, or soft substrate ends up cracking or pulling through — you need a Phillips umbrella head machine screw. Favored by electronics assemblers, appliance technicians, DIYers, and light fabricators, these large flat head bolts spread clamping load across a wider footprint so your workpiece stays intact.
Each pack contains metric machine screws in your chosen size and coating. Sizes range from M2.3×6mm (5mm head diameter) up to M3×25mm (6.5–6.9mm head diameter), with lengths from 4mm (≈5/32") to 25mm (≈1"). Available coatings include 304 Stainless Steel Natural, White Zinc, Black Zinc, Chrome Plating, Nickel-Plated, and Blue-White Zinc. Packs are sold in quantities of 100 to 500 pieces so you can stock exactly what your project demands.
These Phillips umbrella head screws are well-suited for securing plastic enclosures and electronics housings, fastening thin sheet metal panels in HVAC or appliance assembly, and attaching rubber gaskets or soft substrates where pull-through resistance is critical. Their cross-recess drive works with any standard #1 or #0 Phillips screwdriver or bit.
🔩 Compatibility Note: These are metric machine screws (M2.3 / M2.5 / M3) with standard metric coarse thread. They require metric-threaded nuts, inserts, or pre-tapped holes. Not compatible with imperial (UNC/UNF) threads. Confirm your thread standard before ordering.
✅ Key Features of These Phillips Umbrella Head Machine Screws
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🔘Wide Umbrella Head Design — The oversized flat head (D=5mm to 6.9mm depending on variant) distributes clamping force over a larger surface area, reducing pull-through risk in plastic panels and thin sheet metal.
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⚙️Phillips Cross-Recess Drive — Compatible with standard #0 and #1 Phillips screwdrivers and power bits, making installation fast and accessible with tools you already own.
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🛡️Six Coating Options — From 304 stainless steel for corrosion-prone environments to chrome and nickel plating for decorative finishes, choose the surface treatment that matches your application and environment.
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📐Precise Metric Sizing — Available in M2.3, M2.5, and M3 diameters with lengths from 4mm (≈5/32") to 25mm (≈1"), covering a wide range of thin-material fastening needs in electronics and light fabrication.
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📦Flexible Pack Quantities — Order 100, 200, 300, 400, or 500 pieces per pack so you can match your project scale without over-buying or running short mid-job.
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🏭Consistent Thread Engagement — Metric coarse thread profile ensures reliable engagement with standard metric nuts and threaded inserts, reducing the risk of cross-threading in small-diameter applications.
⚠️ Spec Confirmation: Head diameter (D) varies by size variant — confirm the D value shown in the size option (e.g., D=5mm, D=6.5mm, D=6.9mm) matches your countersink or clearance hole before ordering. Contact us if you need to verify thread pitch or torque specifications.
📐 Technical Specifications — Phillips Umbrella Head Machine Screws
| Drive Type |
Phillips (Cross Recess) |
| Head Style |
Umbrella / Large Flat Head (Mushroom Head) |
| Thread Standard |
Metric Coarse (ISO) |
| Available Diameters |
M2.3 / M2.5 / M3 |
| Available Lengths |
4mm (≈5/32") / 6mm (≈1/4") / 8mm (≈5/16") / 16mm (≈5/8") / 25mm (≈1") |
| Head Diameter (D) |
5mm (M2.3) / 5.5mm (M2.5) / 6.5mm or 6.9mm (M3) — see variant |
| Available Coatings |
304 Stainless Steel Natural, White Zinc, Black Zinc, Chrome Plating, Nickel-Plated, Blue-White Zinc |
| Pack Quantities |
100 / 200 / 300 / 400 / 500 PCS |
| Corrosion Resistance |
High (304 SS) / Moderate (Zinc / Chrome / Nickel) — see coating selection |
| Recommended Driver Bit |
Phillips #0 (M2.3–M2.5) / Phillips #1 (M3) |
| Typical Application |
Electronics housings, plastic panels, thin sheet metal, appliance assembly |
| Country of Origin |
See variant options |
❓ Frequently Asked Questions
How do I choose the right size for my application?
Match the screw diameter (M2.3, M2.5, or M3) to your tapped hole or nut size. For length, the screw should generally penetrate the receiving material by at least 1.5× the screw diameter. For example, an M3 screw typically needs at least 4.5mm of thread engagement. Our length options range from 4mm (≈5/32") to 25mm (≈1") — choose based on your material stack thickness plus the required thread engagement depth.
What is the load-bearing or clamping strength of these screws?
Strength depends on the coating and base material. The 304 stainless steel variants generally offer tensile strength in the range of 500–700 MPa. Zinc-plated carbon steel variants are typically in the 400–600 MPa range. For critical structural applications, please contact us to confirm the exact grade before ordering.
Can these screws be used outdoors or in humid environments?
The 304 Stainless Steel Natural finish offers the best corrosion resistance and is generally suitable for outdoor and humid environments. Zinc-plated variants (White Zinc, Black Zinc, Blue-White Zinc) and Chrome/Nickel-Plated options provide moderate corrosion protection for indoor or semi-sheltered use. For marine or highly corrosive environments, we recommend the stainless steel option.
What thread standard do these screws use — metric or imperial?
These are metric machine screws (M2.3, M2.5, M3) with standard metric coarse thread pitch. They are compatible with metric-threaded nuts, inserts, and tapped holes. They are not interchangeable with imperial (UNC/UNF) threads. If your project uses inch-based fasteners, please contact us before ordering.
Why choose an umbrella (large flat) head over a standard pan head?
The umbrella head — also called a large flat head or mushroom head — has a wider bearing surface (D=5mm to 6.9mm depending on size). This distributes clamping force over a larger area, making it ideal for soft or thin materials like plastic panels, thin sheet metal, or rubber gaskets where a standard pan head might pull through or cause surface damage.
Which coating should I choose for my project?
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304 Stainless Steel Natural — Best for outdoor, humid, or corrosion-prone environments.
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White Zinc / Blue-White Zinc — Good general-purpose indoor option with a clean silver appearance.
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Black Zinc — Suits applications where a dark, low-visibility finish is preferred.
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Chrome Plating / Nickel-Plated — Typically chosen for decorative or consumer electronics applications where appearance matters.
How many screws come in each pack, and can I buy in bulk?
Each listing is available in packs of 100, 200, 300, 400, or 500 pieces. Select your preferred quantity from the variant options above. For larger wholesale quantities beyond 500 pcs, please contact us to confirm availability and pricing.
🛒 Select your size, coating, and quantity above, then add to cart — ships from our US warehouse.
