BS ISO 9618
Aerospace. Nuts, hexagonal, slotted castellated, reduced height, normal across flats, with MJ threads, classifications: 450 MPa at ambient temperature/120 °C, 450 MPa at ambient temperature/235 °C, 600 MPa at ambient temperature/425 °C, 900 MPa at ambient temperature/235 °C, 900 MPa at ambient temperature/315 °C, 900 MPa at ambient temperature/650 °C, 1100 MPa at ambient temperature/730 °C and 1250 MPa at ambient temperature/600 °C. Dimensions