DIN EN 2809:1990-07

Aerospace series - Nuts, hexagon, slotted/castellated, reduced height, normal across flats, in heat resisting steel, silver plated - Classification: 900 MPa (at ambient temperature)/650 °C; German version EN 2809:2001

Aerospace series - Nuts, hexagon, slotted/castellated, reduced height, normal across flats, in heat resisting steel, silver plated - Classification: 900 MPa (at ambient temperature)/650 °C

Aerospace series; nuts, hexagon, slotted/castellated, thin; normal across flats; in resisting steel, silver plated; classification: 600 MPa/650 °C