ISO 4014:2011规定了螺纹M1,6至M24的M1,6螺纹，包括M64螺纹的六角头螺栓的特性，额定长度可达10d或150 mm，以较短者为准，产品等级B为M24以上的螺纹，公称长度超过10d或150 mm，以较短者为准

ISO 4014:2011 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 10d or 150 mm, whichever is the shorter, and product grade B for threads over M24 or nominal lengths over 10d or 150 mm, whichever is the shorter.