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When a screw head needs to sit flush with or below the surface of your workpiece, a standard pan head just won't cut it. Engineers, makers, and DIYers working on electronics enclosures, aluminum panels, plastic housings, and precision assemblies need a countersunk screw that seats cleanly without protruding — and that holds up over time without rusting or seizing.
These flat head Phillips machine screws are made from stainless steel and feature a fully countersunk 90° head profile designed to sit flush in standard countersunk holes. Available in metric sizes M2, M2.5, M3, M4, M5, and M6, with lengths ranging from 5mm (≈3/16") to 100mm (≈3.94"), and sold in packs of 1, 10, 50, or 100 pieces to match your project scale. All screws follow ISO metric thread standards.
Typical applications include securing PCB standoffs and electronics chassis panels, assembling aluminum extrusion frames, mounting hardware in 3D printer builds, and fastening plastic enclosure covers — anywhere a flush, clean finish is required with a stainless steel flat head Phillips screw.
| Drive Type | Phillips (Cross / PH) |
|---|---|
| Head Style | Flat Head (Countersunk, 90°) |
| Material | Stainless Steel (see variant options for grade confirmation) |
| Thread Standard | ISO Metric (M-series) |
| Available Diameters | M2, M2.5, M3, M4, M5, M6 |
| Available Lengths | 5mm (≈3/16") to 100mm (≈3.94") — see variant options |
| Pack Quantities | 1 pc, 10 pcs, 50 pcs, 100 pcs |
| Finish | Natural stainless (uncoated) |
| Recommended Driver Bit | PH0 (M2–M2.5), PH1 (M3–M4), PH2 (M5–M6) |
| Corrosion Resistance | Suitable for indoor and light outdoor use — contact us to confirm for marine environments |
| Self-Tapping | No — requires tapped hole, threaded insert, or nut |
| Country of Origin | Contact us to confirm |
Generally, the screw length should equal the thickness of the material being fastened plus enough thread engagement in the receiving part — typically 1.5× to 2× the screw diameter. For example, an M3 screw threading into aluminum generally needs at least 4.5mm of thread engagement. If you are unsure, contact us to confirm before ordering.
Quick inch reference: 10mm ≈ 3/8", 25mm ≈ 1", 50mm ≈ 2", 100mm ≈ 4".
These screws are typically made from 304 stainless steel, which generally offers a tensile strength of around 500–700 MPa depending on the specific grade and diameter. For load-critical applications, please contact us to confirm the exact material specification before use.
Stainless steel offers good corrosion resistance in most outdoor environments. For mild outdoor exposure, these screws generally perform well. For harsh marine or highly corrosive environments, 316 stainless steel is typically recommended — please contact us to confirm the alloy grade before use in demanding conditions.
These screws follow the ISO metric thread standard (M-series), which is the most widely used standard internationally. They are compatible with standard metric nuts, threaded inserts, and tapped holes following ISO 68-1 specifications. They are not compatible with UNC/UNF (imperial) threads.
The correct bit size depends on the screw diameter:
Always use the correct bit size to avoid cam-out and head damage, especially on smaller M2 and M2.5 screws.
Yes. These countersunk machine screws are commonly used in aluminum, plastic enclosures, electronics housings, and light woodworking applications with pre-drilled and tapped holes or threaded inserts. They are not self-tapping — a matching tapped hole or nut is required for proper installation.
Divide the millimeter value by 25.4 to get inches. Common conversions for this product range:
