M2 M3 Titanium Countersunk Socket Head Screws – Hex Drive Flat Head

Note that the listed length includes the head. Measure the total thickness of the material you are fastening. For a flush finish, the screw length should equal the material thickness so the head sits level with the surface. For example, a 6mm (≈1/4") thick panel typically calls for an M2x6 or M3x6 screw. When in doubt, choose the next length up and countersink slightly deeper. If threading into a blind hole, leave at least 1–1.5× the thread diameter of clearance at the bottom.

Titanium alloy fasteners generally offer a tensile strength comparable to mid-grade alloy steel — typically in the range of 900–1000 MPa for Grade 5 / Ti-6Al-4V alloy — while weighing approximately 45% less. This makes them well-suited for weight-sensitive applications such as RC vehicles, drones, bicycle components, and precision instruments where reducing rotating or unsprung mass matters. Contact us to confirm the specific alloy grade and mechanical properties for your application.

Yes. Titanium alloy is inherently corrosion-resistant due to a stable oxide layer that forms on its surface. It generally performs well in saltwater, humid, and mildly acidic environments without additional coating. This makes these titanium countersunk screws a practical choice for marine hardware, outdoor electronics enclosures, and cycling components exposed to rain and road spray. For highly aggressive chemical environments, contact us to confirm suitability.

These screws follow the ISO metric coarse thread standard. M2 uses a 0.4mm pitch and M3 uses a 0.5mm pitch. They are compatible with standard metric tapped holes, threaded inserts, and metric nuts of the same diameter and pitch. They are not compatible with UNC/UNF (inch) threads.

M2 countersunk socket head screws typically require a 1.5mm hex key (Allen wrench). M3 countersunk socket head screws typically require a 2mm hex key. Always do a test fit before applying full torque to confirm the key seats fully in the socket without play. Titanium is more susceptible to socket rounding than steel if an ill-fitting key is used, so use a quality hex key set.

Yes. Titanium and aluminum have a low galvanic corrosion potential relative to each other, making titanium screws a technically sound choice for aluminum frames and enclosures. They are also widely used in carbon fiber composite panels and rigid plastic assemblies. Use a calibrated torque wrench and follow the recommended torque specification for the thread size to avoid stripping the tapped hole, especially in softer materials. For plastic, consider using a threaded insert for best results.

For a single repair or prototype build, 10 or 20 pcs is generally sufficient. Workshop restocking or small production runs typically call for 30–50 pcs. For ongoing manufacturing, RC builds, or bicycle workshop use, 80 or 100 pcs offers a lower per-unit cost and reduces reorder frequency. All quantities ship in the same secure packaging from our US warehouse.