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When your project demands hardware that disappears into the surface — custom PC builds, black anodized panels, marine enclosures, or automotive trim — standard silver screws break the look. These M3, M4, and M5 hex socket countersunk screws are built for builders who care about the details.
Machined from A2 stainless steel (304) and coated with a durable electrophoresis black finish, each screw features a 90° flat countersunk head that sits perfectly flush after proper countersinking. Thread diameters M3–M5, lengths from 5 mm (~0.20 in) to 30 mm (~1.18 in) overall (head included), fully threaded, coarse pitch.
Ideal for electronics enclosures, black hardware builds, outdoor equipment, marine fittings, and any application where a low-profile, corrosion-resistant dark fastener is required.
Mount black anodized panels, GPU brackets, and custom chassis components with screws that blend seamlessly into your build aesthetic.
A2 stainless steel with black coating handles salt air and moisture — perfect for boat fittings, outdoor enclosures, and weatherproof hardware.
M3–M5 sizing covers the most common metric fastener needs in electronics enclosures, PCB standoffs, and instrument panels.
Flush-fit black screws for interior trim panels, carbon fiber parts, and custom fabrication where hardware visibility matters.
| Standard | GB/T 70.3 / ISO 10642 / DIN 7991 |
|---|---|
| Material | A2 Stainless Steel (304) |
| Finish | Electrophoresis Black |
| Head Style | Countersunk / Flat (90°) |
| Drive Style | Hex Socket (Allen) |
| Thread Type | Coarse Metric, Fully Threaded |
| Thread Diameter | M3, M4, M5 |
| Thread Pitch | M3: 0.5 mm | M4: 0.7 mm | M5: 0.8 mm |
| Hex Key Size | M3: 2 mm | M4: 2.5 mm | M5: 3 mm |
| Overall Length (incl. head) | 5, 6, 8, 10, 12, 16, 20, 25, 30 mm |
| Pack Size Options | 10, 20, 50, 100, 200 Pcs |
For countersunk flat head screws (DIN 7991), length is measured overall — from the top of the head to the tip. An M4 × 10 mm screw has a total length of 10 mm including the head. This matches our listing.
Yes. These are true 90° countersunk screws. To achieve a flush or slightly recessed finish, drill a matching 90° countersink hole using a countersink bit slightly larger than the head diameter.
Yes — all M3, M4, and M5 screws in this range (up to 30 mm overall length) are fully threaded from under the head to the tip, providing maximum grip in blind holes or through-nut applications.
Electrophoresis black bonds firmly to the steel and resists scratches better than paint. Heavy torque or contact with sharp metal may leave marks. However, the base material is A2 stainless steel — even if the coating wears, the screw itself will not rust. This is a major advantage over black-coated carbon steel screws.
M3 uses a 2 mm Allen key, M4 uses 2.5 mm, and M5 uses 3 mm. Always use a quality hex key that fits snugly to avoid rounding the socket.
Yes — these are machine screws. Use standard metric nuts of the same thread size (M3, M4, or M5). They also thread into pre-tapped holes. Note: these are not self-tapping — for wood or plastic, use a threaded insert or a nut on the back.
Electrophoresis (e-coat) applies a polymer coating via electrical charge, resulting in a uniform, well-adhered film with better corrosion resistance than traditional black oxide. Black oxide is a chemical conversion coating that offers minimal corrosion protection on its own and typically requires oil treatment.
A2 stainless steel is generally non-magnetic in its annealed state. However, cold working during manufacturing (such as thread rolling) can induce slight magnetism. For most applications this is not an issue, but if zero magnetism is critical, please verify with a magnet before use.
