Titanium Phillips Flat Head Machine Screws — GR2 Countersunk, M2 to M8

A general rule is to use a screw length that is 2–3 times the thickness of the material being fastened. For example, if your panel is 5mm (about 3/16") thick, an M3 x 15mm or M3 x 20mm screw is typically appropriate. Always account for the countersink depth so the head sits flush with the surface. When in doubt, size up — you can always use a washer or spacer to adjust.

These screws are made from Grade 2 commercially pure titanium, also designated TA2 or GR2. This grade offers a good balance of strength, ductility, weldability, and corrosion resistance. It is the most widely used titanium grade for fasteners in cycling, marine, and general engineering applications.

Yes. Titanium GR2 is highly resistant to corrosion, including exposure to salt water, chlorine, and most atmospheric conditions. These screws are generally well-suited for outdoor, marine, and humid environments where stainless steel may still corrode over time. No additional coating or treatment is typically required for corrosion protection.

These screws follow the ISO metric thread standard. Each size (M2, M2.5, M3, M4, M5, M6, M8) uses the standard metric coarse thread pitch for that diameter. They are compatible with standard metric nuts, threaded inserts, and tapped holes of the corresponding size. They are not compatible with UNC/UNF inch-standard threads.

Use the correct Phillips bit size to avoid cam-out and head damage. As a general guide: PH0 is typically used for M2–M2.5, PH1 for M3–M4, and PH2 for M5–M8. Always use a well-fitting bit and apply firm downward pressure during installation, especially with titanium, which can be more susceptible to drive recess damage than hardened steel.

Titanium GR2 has a tensile strength of approximately 345 MPa, which is generally lower than 304 stainless steel (~515 MPa) or A2-70 stainless (~700 MPa). However, titanium is roughly 45% lighter by volume, making it the preferred choice in weight-sensitive applications — such as cycling, aerospace components, and precision instruments — where load requirements are moderate and weight savings are critical.

In most cases, yes. Titanium screws can typically be removed and reinstalled multiple times, especially when threading into softer materials or threaded inserts. Avoid over-torquing on installation. When threading into aluminum or other metals, applying a small amount of anti-seize compound is generally recommended to prevent galling, which titanium can be prone to under high friction.