UNI EN ISO 4014 Standard Dimensions for
This standard (DIN EN ISO 4014) specifies the characteristics of hexagon head bolts with threads from M1,6 up to and including M64, of product grade A for threads M1,6 to M24 and nominal lengths up to and including 10 d or 150 mm, whichever is the shorter, and product grade B for threads over M24 or nominal lengths over 10 d or 150 mm, whichever is the shorter.
Dimensional Drawing and Technical Diagrams