1. Chemical nickel plating of titanium increases its anti-friction quality. 2. When two surfaces with a nickel coating 20–40μ thick are fitted together the pressure at which grabbing begins is 180–200 kg/cm2 and the friction coefficients are respectively 0.12–0.15 for the thinnest layer (20μ) and 0.15–0.30 for layers about 40 μ thick. 3. When the thickness of the coating is increased, grabbing begins at lower pressures (80 kg/cm2 and the friction coefficient increases to 0.3–0.4. 4. When nickel-coated titanium is fitted to a surface of unhardened titanium the pressure at which grabbing occurs is about 80–100 kg/cm2 and the friction coefficient is 0.15–0.35. 5. Galvanic coatings of chromium, etc., can easily be deposited on titanium coated with nickel.