This European Standard specifies the characteristics of prevailing torque type hexagon nuts with flange, with non-metallic annular insert and coarse threads f from M5 to M20 inclusive, in product grade A for threads up to and including M16and product grade B for threads above M16 and property classes 8 and 10.
PUBLISHED
EN 1663:1997
90.93
Standard confirmed
Apr 13, 2023