ISO 8676:2011规定了公制螺纹直径d，从8 mm到24 mm以及额定长度的公制螺纹直径为8 mm至64 mm的公制螺纹螺纹的特性，l至多，包括10d或150 mm（以较短者为准），产品等级B的公称螺纹直径d超过24 mm或公称长度l，超过10d或150 mm，以较短者为准

ISO 8676:2011 specifies the characteristics of hexagon head screws with metric fine pitch thread with nominal thread diameters, d, from 8 mm to 64 mm, of product grade A for nominal thread diameters, d, from 8 mm to 24 mm and nominal lengths, l, up to and including 10d or 150 mm, whichever is the shorter, and of product grade B for nominal thread diameters, d, over 24 mm or nominal lengths, l, over 10d or 150 mm, whichever is the shorter.