ISO 7720:2012, Prevailing torque type all-metal hexagon nuts, style 2 – Property class 9

ISO 7720:2012 specifies the characteristics of prevailing torque type all-metal hexagon nuts, of style 2, with threads from M5 up to and including M36, in product grade A for threads up to and including M16, and product grade B for threads over M16, and with property class 9.