Titanium Watch Grades Explained
Grade 2, Grade 5, Super Titanium, High-Intensity Titanium, and proprietary hardened alloys are not interchangeable. Here is what the labels usually mean.
What "titanium" means in watches
On a spec sheet, "titanium" can mean several different things: commercially pure titanium, a titanium alloy such as Grade 5, a brand's proprietary alloy, surface-hardened titanium, or a branded titanium system that bundles an alloy with a treatment. The word alone does not tell you how hard, heavy, or scratch resistant a case will be. The grade and any treatment do.
Grade 2 titanium
Grade 2 is commercially pure titanium. It is lightweight, highly corrosion resistant, and very skin friendly, which is why it shows up so often in tool watches and dive watches. It is softer than Grade 5, so an untreated Grade 2 case can pick up marks more readily.
Grade 5 titanium
Grade 5 is a titanium alloy, usually titanium with aluminum and vanadium (often written Ti-6Al-4V). It is harder and stronger than Grade 2, can take a sharper polish, and turns up frequently in higher-end watches. For watch-case purposes it is still generally considered nickel-free, though anyone with a severe allergy should confirm with the maker.
Proprietary titanium alloys
Several brands market their own titanium. The names usually describe an alloy, a treatment, or a bundle of both, and the exact recipe is often not fully disclosed.
- Grand Seiko High-Intensity Titanium: a brand alloy promoted as harder and more scratch resistant than ordinary titanium.
- Citizen Super Titanium: titanium combined with Citizen's Duratect surface hardening.
- Seiko titanium with super-hard coating: titanium finished with a hard surface coating.
- Sinn hardened titanium: Sinn applies its Tegiment surface-hardening process to titanium parts.
- Formex hardened titanium: Formex uses a case-hardening treatment on its titanium cases.
Where a brand does not publish hardness figures or the full alloy, we describe the term as a brand term and avoid quoting numbers we cannot source. Verify specifics with the maker.
How the grades compare
| Material / grade | Typical use | Scratch resistance | Weight | Skin comfort | Common brands |
|---|---|---|---|---|---|
| Grade 2 | Tool and dive watches | Lower unless treated | Light | Very good | Sinn, Citizen, microbrands |
| Grade 5 | Higher-end and sport watches | Higher than Grade 2 | Light | Very good | Omega, Tudor, Christopher Ward |
| High-Intensity Titanium | Grand Seiko lineups | Higher (brand alloy) | Light | Very good | Grand Seiko |
| Super Titanium | Citizen lineups | Higher (alloy plus Duratect) | Very light | Very good | Citizen |
| Titanium with hard coating | Divers and tool watches | High at the surface | Light | Very good | Seiko, Sinn, RZE, Zelos |
| Titanium Damascus / specialty | Limited and artisanal pieces | Varies | Light | Very good | ArtyA and specialists |