BS ISO 9609
Aerospace. Nuts, hexagonal, plain, reduced height normal across f lats, with MJ threads, classifications: 450 MPa (at ambient temperature) /120 °C, 450 MPa (at ambient temperature) /235 °C, 600 MPa (at ambi ent temperature) /425 °C, 900 MPa (at ambient temperature) /235 °C, 900 MPa (at ambient temperature) /315 °C, 900 MPa (at ambient tempera ture) /650 °C,/*