[en] Hydrogen in excess of the terminal solid solubility precipitates out as brittle hydride phase in zirconium alloys. Hydrides acquire platelet shaped morphology due to its accommodation in the matrix and can cause severe embrittlement in zirconium alloys, especially when these are oriented normal to the tensile stress axis. The precipitation of hydride platelets normal to the tensile stress when cooled under stress from a solution annealing temperature is commonly referred to as stress-reorientation phenomenon of hydride. Stress-reorientation is associated with a threshold stress below which no reorientation can occur. In this work, threshold stress for reorientation ofhydrides were determined for cold worked and stress-relieved Zr-2.5 wt. % Nb pressure tube material as a function of reorientation temperature. Effect of the reoriented hydride on tensile properties of the Zr-2.5Nb Pressure tube alloy has been evaluated in the temperature range varying in 25-300 degC. (author)