DS DS/EN ISO 4017
DS DSEN SO 4017 2011-JUN-13 Hexagon head screws - Product grades A and B
ISO 4017:2010 specifies the characteristics of hexagon head screws 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.
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