DIN EN 2810:1990-07

Aerospace series - Nuts, hexagon, slotted/castellated, reduced height, normal across flats, in heat resisting steel, passivated - Classification: 900 MPa (at ambient temperature)/650 °C; German version EN 2810:2001

Aerospace series - Nuts, hexagon, slotted/castellated , reduced height, normal across flats, in heat resisting steel, passivated; Classification: 600 MPa (at ambient temperature)/650 °C

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