Here is an excellent essential tool released to help readers embarking on their future careers in the field of mechanical engineering; it was specifically designed and published to provide all interested people with a wide range of useful theoretical and practical information that they would need during their studies and later, when they become professional engineers. This is the updated edition of the Databook replacing all three previous releases that were also very successful and popular. The content of the volume has significantly increased in comparison to the very first edition of the Databook. What it means is that the coverage of the basic units and data has also been increased, and same applies to the engineering rules. The material provided in the book is covering all critically important aspects of structural integrity and also reliability of various components of engineering systems. We would also underline that the content of the present Databook keeps reflecting the technical information that is considered necessary for students and professional engineers. Since the time of the initial release of this publication the number of European standards applicable to engineering has drastically increased, and all relevant changes have also been reflected in the latest release of the Databook.