EN 3230:2001 Aerospace series - Nuts, hexagon, slotted/castellated, reduced height, normal across flats, in steel, cadmium plated - Classification: 900 MPa (at ambient temperature)/235 °C
This standard specifies the characteristics of hexagonal slotted/castellated nuts,reduced height,normal across flats,in steel,cadmium plated.
EN 3230:2001 history
2001EN 3230:2001 Aerospace series - Nuts, hexagon, slotted/castellated, reduced height, normal across flats, in steel, cadmium plated - Classification: 900 MPa (at ambient temperature)/235 °C