Aerospace. Nuts, hexagonal, plain, normal height, normal across flats, with MJ threads, classifications: 600 MPa (at ambient temperature)/120 °C, 600 MPa (at ambient temperature)/235 °C, 900 MPa (at ambient temperature)/425 °C, 1100 MPa (at ambient temperature)/ 235 °C, 1100 MPa (at ambient temperature)/315 °C, 1100 MPa (at ambient temperature)/650 °C, 1210 MPa (at ambient temperature)/730 °C, 1250 MPa(at ambient temperature)/235 °C and 1550 MPa (at ambient temperature)/600 °C."