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When a protruding screw head is not an option — in furniture joinery, precision instrument panels, or clean-line cabinetry — you need a countersunk screw that sits perfectly flush. These DIN 963 countersunk slotted machine screws cover M2 through M8 in a single listing, giving woodworkers, fabricators, and repair technicians a reliable source for the metric flat-head fasteners they reach for most.
Each screw is manufactured from A2 stainless steel (Grade 304) with a flat top countersunk head and slotted drive, conforming to DIN 963 dimensional standards. Diameters range from M2 (≈0.079”) to M8 (≈0.315”), with lengths from 4mm (5/32”) to 60mm (≈2-3/8”). Available in packs of 5, 10, 20, or 50 pieces — order exactly what your project requires.
These A2 stainless countersunk screws are a go-to choice for furniture assembly, electronics enclosure panels, instrument mounting, and architectural hardware where a flush, clean surface finish is required. The 90° countersunk head profile mates precisely with standard countersunk holes, pulling the screw head flush or slightly below the surface for a professional result.
| Material | A2 Stainless Steel (Grade 304 / A2-70) |
|---|---|
| Head Type | Flat Top Countersunk — Slotted Drive |
| Standard | DIN 963 |
| Head Angle | 90° (typically) |
| Thread Type | ISO Metric, Full Thread |
| Available Diameters | M2, M2.5, M3, M4, M5, M6, M8 |
| Available Lengths | 4mm (5/32”) to 60mm (≈2-3/8”) — See variant options |
| Pack Quantity | 5 / 10 / 20 / 50 Pcs — See variant options |
| Drive Size | Flat-blade 1.5–2.5mm (M2–M3) / 3–4mm (M4–M5) / 4–6mm (M6–M8) — typically |
| Finish | Natural stainless (no coating) |
| Corrosion Resistance | Good for indoor and light outdoor use; not recommended for prolonged salt-spray or marine exposure |
| Country of Origin | Contact us to confirm |
Countersunk (flat top) screws are designed to sit flush with or below the surface of the material when fully driven into a countersunk hole. Pan head screws sit above the surface. Countersunk screws are preferred when a smooth, flush finish is required — common in furniture, cabinetry, and precision assemblies where a protruding head would be a snag hazard or aesthetic issue.
A2 stainless steel (also known as 304 stainless) is an austenitic grade offering good corrosion resistance in most indoor and outdoor environments. It is non-magnetic in its annealed state and suitable for general-purpose applications including furniture, electronics, and light outdoor use. For highly corrosive environments such as marine or salt-spray exposure, A4 (316) stainless is typically recommended.
DIN 963 is a German industrial standard specifying the dimensions and tolerances for countersunk slotted machine screws. Screws manufactured to DIN 963 have consistent head angles (typically 90°), thread pitches, and shank dimensions — ensuring interchangeability and reliable fit in standard countersunk holes. This matters when replacing existing hardware or specifying fasteners for engineered assemblies.
For countersunk screws, the stated length includes the head. A general rule is to select a length that allows at least 2–3 thread diameters of engagement in the tapped hole or nut. For example, an M4 screw should engage at least 8–12mm of thread. For blind holes, leave 1–2mm clearance at the bottom to avoid bottoming out. When in doubt, size up and use a lock washer or thread-locking compound for added security.
Slotted screws require a flat-blade (straight) screwdriver. The blade width should match the slot width as closely as possible — a blade that is too narrow will cam out and damage the slot, while one that is too wide may damage the surrounding material. For M2–M3, a precision flat-blade driver (1.5–2.5mm) is typically used; for M4–M8, a standard flat-blade driver (3–6mm) is appropriate. Avoid power-driving at high torque to prevent slot damage.
A2 stainless steel screws are generally suitable for outdoor use in most climates, including light rain and humidity. They are not recommended for prolonged exposure to salt water, chlorinated water, or highly acidic environments. For coastal or marine applications, A4 (316) stainless steel is typically preferred for better long-term corrosion resistance.
Yes. These screws follow ISO metric thread standards (DIN 963) and 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 coarse metric pitches apply for these sizes.
