SANS 1700-7-2-1996 紧固件.第7部分:外轴六角螺栓和螺丝.第2子部分:六角螺栓.B级.缩柄(柄直径约等于螺纹中径)
Fasteners Part 7: External drive hexagon bolts and screws Section 2: Hexagon head bolts - Product grade B - Reduced shank (shank diameter approximately equal to pitch diameter)
Gives specifications for hexagon head bolts with metric dimensions and thread diameters from 3 mm up to and including 20 mm, with reduced shank, of product grade B.