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Finding a single M3 countersunk screw in the right length — especially at 40mm, 60mm, or 80mm — usually means ordering from multiple suppliers or buying far more than you need. These A2 stainless steel Phillips countersunk flat head machine screws in M3 to GB/T 819 cover the full range from M3×4mm (0.16”) to M3×80mm (3.15”) in a single listing, with 24 length options and variable pack quantities scaled to screw length.
The 90° countersunk head sits flush with or below the surface when driven into a properly countersunk hole, eliminating snag points and delivering a clean finish on panels, enclosures, and woodwork. GB/T 819 is dimensionally compatible with ISO 7046 and DIN 965 — these screws are interchangeable with metric countersunk screws to those standards. A2 (304) stainless steel provides reliable corrosion resistance without the weight or cost of larger fasteners.
Typical applications include electronics enclosure and panel mounting where a flush surface is required, woodworking and joinery projects, bracket and fixture assembly, equipment repair and maintenance specifying M3 countersunk fasteners, and general precision DIY where a clean flush finish and corrosion resistance are both required.
| Material | A2 Stainless Steel (304 / 18-8) |
|---|---|
| Finish | Natural stainless (no coating) |
| Thread Standard | ISO Metric M3 |
| Thread Diameter | M3 (3mm) |
| Head Style | Countersunk Flat Head (90° angle) |
| Drive Type | Phillips PH1 |
| Standard | GB/T 819 (compatible with ISO 7046 / DIN 965) |
| Available Lengths | 4mm (0.16”), 5mm (0.20”), 6mm (0.24”), 7mm (0.28”), 8mm (0.31”), 9mm (0.35”), 10mm (0.39”), 12mm (0.47”), 14mm (0.55”), 16mm (0.63”), 18mm (0.71”), 20mm (0.79”), 22mm (0.87”), 25mm (0.98”), 28mm (1.10”), 30mm (1.18”), 35mm (1.38”), 40mm (1.57”), 45mm (1.77”), 50mm (1.97”), 55mm (2.17”), 60mm (2.36”), 70mm (2.76”), 80mm (3.15”) |
| Pack Quantities | 30 pcs (4–6mm) / 25 pcs (7–10mm) / 20 pcs (12–14mm) / 15 pcs (16–20mm) / 10 pcs (22–35mm) / 5 pcs (40–60mm) / 4 pcs (70mm) / 3 pcs (80mm) |
| Length Measurement | Including head (total length per GB/T 819) |
| Screw Type | Machine screw (requires tapped hole or nut) |
| Corrosion Resistance | Excellent — suitable for indoor and light outdoor use |
| Common Applications | Electronics enclosures, panel mounting, woodworking, bracket assembly, equipment repair, precision DIY |
For countersunk screws, length is measured including the head (total length per GB/T 819). The screw should sit flush with or just below the surface when fully driven into a properly countersunk hole at 90°. Available lengths: 4mm (0.16”) to 80mm (3.15”). When in doubt, size up.
GB/T 819 is the Chinese national standard for countersunk flat head machine screws with a Phillips drive and a 90° head angle. It is dimensionally compatible with ISO 7046 and DIN 965, making these screws interchangeable with metric countersunk screws to those standards. If your application specifies any of these standards, these screws are a direct match.
A2 is the most common grade of austenitic stainless steel, equivalent to 304 or 18-8 stainless. It offers excellent corrosion resistance, is non-magnetic in most conditions, and is the standard material for general-purpose stainless fasteners in electronics, fixtures, and light outdoor use.
A2 stainless steel provides strong corrosion resistance and will not rust under normal indoor conditions or light outdoor exposure. For marine, coastal, or highly corrosive environments, A4 (316) stainless is generally recommended.
A Phillips PH1 screwdriver for M3. Always use a well-fitting driver to avoid cam-out, especially when driving the screw flush into a countersunk hole. A worn or undersized driver can damage the head and surrounding material.
Pack quantities are set by weight and value: shorter screws (4–6mm) come in packs of 30, medium lengths (7–16mm) in 15–25 pieces, and longer screws (40–80mm) in 3–5 pieces. This keeps each pack at a consistent value regardless of screw length — you’re always getting a fair quantity for the price.
Yes — these are machine screws, not self-tapping. They require a pre-tapped M3 hole or a matching M3 metric nut. They will not cut their own thread into plastic, wood, or metal.
