This European Standard covers the classification of bolt materials used in combination with steel flanges according to EN 1759-1 (Class designated).Bolt materials are listed in EN 1515-1; flange material groups are listed in EN 1759-1.
EN 1515-3:2005 history
2005EN 1515-3:2005 Flanges and their joints - Bolting - Part 3: Classification of bolt materials for steel flanges, class designated