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When a protruding screw head isn't an option — whether you're assembling a panel that needs a smooth surface, mounting hardware flush to a frame, or building electronics enclosures where clearance matters — a countersunk flat head machine screw is the right call. These stainless steel flat-head Phillips machine screws are designed for exactly those situations, giving makers, fabricators, and DIYers a reliable flush-mount fastener across a wide range of metric sizes.
Each pack contains fully threaded metric machine screws in your chosen size and quantity. Available in M2, M2.5, M3, M4, M5, and M6 diameters with lengths ranging from 5mm (≈3/16") to 100mm (≈3-15/16"). The countersunk flat head sits flush with or below the surface when installed in a properly prepared hole. Material is 304 stainless steel for solid corrosion resistance. Pack quantities are 1, 5, or 10 pieces, depending on the size selected.
Typical applications include electronics chassis and enclosure assembly, furniture and cabinetry hardware, 3D printer frame construction, RC vehicle builds, and any project where a flush, snag-free surface is required. These countersunk Phillips machine screws are a staple for anyone working with metric hardware in aluminum, plastic, or steel.
| Material | 304 Stainless Steel |
|---|---|
| Finish | Natural stainless (silver) |
| Head Type | Flat Head / Countersunk (90° included angle) |
| Drive Type | Phillips (PH1 for M2–M3; PH2 for M4–M6) |
| Thread Standard | ISO Metric Coarse Pitch |
| Available Diameters | M2, M2.5, M3, M4, M5, M6 |
| Available Lengths | 5mm (≈3/16") – 100mm (≈3-15/16") |
| Thread Type | Fully threaded machine screw |
| Pack Quantity Options | 1 / 5 / 10 pcs (varies by size) |
| Countersink Angle | Typically 90° — confirm with your countersink bit |
| Tensile Strength | See variant options |
| Country of Origin | Contact us to confirm |
For flat head (countersunk) screws, the listed length includes the head. Measure the total thickness of the material being fastened and add enough thread engagement in the receiving part — typically 1.5× the screw diameter. For example, an M3 screw through a 3mm panel into a tapped hole generally calls for a total length of 8–12mm (≈5/16"–15/32"). Use the Size selector above to pick your combination.
These are 304 stainless steel machine screws with a natural silver finish. 304 stainless is an austenitic alloy that offers good corrosion resistance in most indoor and light outdoor environments. It is non-magnetic in its annealed state and widely used in electronics, furniture, and general fabrication.
Yes — when installed in a properly countersunk hole, the flat head sits flush with or slightly below the surface. Without countersinking, the head will protrude. Use a countersink bit matched to the screw's head angle (typically 90° for metric machine screws) to prepare the hole correctly.
304 stainless steel generally performs well in light outdoor and humid environments. For harsh marine or highly corrosive conditions, 316 stainless steel is typically recommended. For most sheltered outdoor applications, these will generally hold up well.
Yes. These follow the ISO metric coarse-pitch thread standard (M2, M2.5, M3, M4, M5, M6). They are compatible with standard metric nuts, threaded inserts, and tapped holes of the corresponding size. They are not compatible with UNC/UNF (inch) threads.
These screws use a Phillips drive. For M2 and M2.5 sizes, a PH0 or PH1 bit is typically correct. For M3, a PH1 bit is generally the right fit. For M4–M6, a PH2 bit is recommended. Always use a properly sized bit to avoid cam-out and head damage — especially critical with smaller M2 screws.
Pack quantity depends on the size and length selected — options include 1, 5, or 10 pieces per pack. The quantity is shown in the "Amount" variant selector. If you need quantities beyond what's listed, please contact us to discuss bulk pricing.
Yes. Flat head (countersunk) screws require a countersunk hole to sit flush. Without countersinking, the head will protrude above the surface. Use a countersink bit matched to the screw's head angle — typically 90° for metric machine screws. The countersink diameter should match the head diameter of the screw you're using.
