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When a protruding screw head isn't an option — whether you're assembling electronics enclosures, mounting panels, or building furniture — a flush-fit fastener makes all the difference. These Phillips flat head machine screws are designed for builders, makers, and maintenance professionals who need a clean, countersunk finish without sacrificing holding strength.
Each screw features a full metric thread and a flat countersunk head for flush installation. Available in A2 (304) and A4 (316) stainless steel, with diameters from M2 to M8 and lengths ranging from 3mm (1/8") to 100mm (≈3.9"). Sold in packs of 1 to 50 pieces — choose the quantity that fits your project.
These stainless steel Phillips flat head screws are widely used in electronics assembly, appliance panel mounting, furniture construction, and light fabrication work. Their corrosion-resistant finish makes them a reliable choice for both indoor installations and outdoor-exposed applications such as deck hardware and enclosure mounting.
Countersunk Flat Head Design — Sits flush with the surface when installed in a countersunk hole, ideal for applications where a smooth, snag-free finish is required.
A2 & A4 Stainless Steel Options — A2 (304) suits most indoor and general outdoor use; A4 (316) adds molybdenum for superior salt-spray and chloride resistance in coastal or marine environments.
Wide Size Range — Covers M2 through M8 diameters and lengths from 3mm to 100mm, making these metric flat head screws suitable for fine electronics work up to medium structural fastening.
Full Thread for Maximum Grip — The full-length thread engages more material compared to partial-thread designs, providing stronger pull-out resistance in wood, plastic, and metal substrates.
Flexible Pack Quantities — Available in packs of 1 to 50 pieces per size, so you can order exactly what you need — no waste, no shortage on the job.
Phillips Drive Compatibility — Works with standard PH0, PH1, and PH2 Phillips bits. Compatible with hand screwdrivers and power drivers for fast, consistent installation.
| Material | A2 Stainless Steel (304) / A4 Stainless Steel (316) |
|---|---|
| Head Type | Flat (Countersunk) — Phillips Drive |
| Thread Type | ISO Metric, Full Thread |
| Available Diameters | M2, M2.5, M3, M4, M5, M6, M8 |
| Available Lengths | 3mm (1/8") to 100mm (≈3.9") — See variant options |
| Pack Quantity | 1 / 2 / 5 / 10 / 20 / 40 / 50 pieces — See variant options |
| Drive Size | PH0 (M2–M2.5) / PH1 (M3–M4) / PH2 (M5–M8) — typically |
| Finish | Natural stainless (no coating) |
| Tensile Strength | Typically 500–700 MPa (varies by grade) |
| Country of Origin | Contact us to confirm |
A general rule is to use a screw length that is 2–3 times the thickness of the material being fastened. For example, if you're fastening a 5mm panel, a length of 10–16mm (3/8"–5/8") is typically appropriate. Always ensure the screw does not protrude through the back of the material. For blind holes, match the screw length to the hole depth minus 1–2mm.
A2 (304) stainless steel offers good corrosion resistance for most indoor and general outdoor applications. A4 (316) stainless steel contains added molybdenum, providing superior resistance to salt spray and chlorides — making it the preferred choice for coastal environments, marine applications, and chemical processing facilities. If you're unsure, A4 is the safer long-term choice for any outdoor or wet environment.
Yes. Both A2 and A4 stainless steel grades resist rust and oxidation in outdoor conditions. A2 handles general outdoor exposure well. For environments with salt air, poolside installations, or frequent moisture exposure, A4 is recommended for its enhanced corrosion resistance.
Yes. These screws follow the ISO metric thread standard with full thread engagement. They are compatible with standard metric hex nuts, nylon lock nuts, flange nuts, and threaded inserts of the corresponding diameter (M2 through M8). Always verify the thread pitch matches your application — standard metric pitches apply.
The bit size generally corresponds to the screw diameter: PH0 for M2–M2.5, PH1 for M3–M4, and PH2 for M5–M8. Using the correct bit size is important — an undersized bit can cam out and damage the screw head, while an oversized bit won't seat properly. A snug fit between bit and recess gives the best torque transfer.
Stainless steel machine screws typically have a tensile strength of around 500–700 MPa depending on grade — suitable for light to medium-duty fastening. They are not intended for high-stress structural applications where hardened steel (Grade 8 / 10.9) would be required. For electronics, appliance panels, furniture, and general fabrication, they provide reliable holding strength.
Yes. Phillips flat head machine screws work well with aluminum, ABS plastic, acrylic, and similar materials. Pre-drill a pilot hole sized to the screw's minor diameter to avoid cracking or stripping. For aluminum assemblies subject to vibration, a thread-locking compound or nylon lock nut is recommended to prevent loosening over time.
