This International Standard specifies the characteristics of prevailing torque type all metal hexagon nuts with flange (style 2), and metric fine pitch thread with nominal thread diameters, D, from 8 mm up to and including 20 mm, in product grade A for sizes D ≤ 16 mm and product grade B for sizes D > 16 mm, and with property classes 6, 8 and 10. NOTE The dimensions of the nuts correspond to those given in ISO 10663 plus prevailing torque feature. If other specifications are required, they can be selected from existing International Standards, for example ISO 261, ISO 724, ISO 898-2, ISO 965-2, ISO 2320 and ISO 4759-1.