1998DIN EN 1663:1998-02 Prevailing torque type hexagon nuts with flange (with non-metallic insert) (ISO 7043:1997, modified); German version EN 1663:1997
1998DIN EN 1663:1998 Prevailing torque type hexagon nuts with flange (with non-metallic insert) (ISO 7043:1997, modified); German version EN 1663:1997