Aéronautique et espace — Écrous hexagonaux ordinaires, hauteur réduite, surplats normaux, à filetage MJ, classifications: 450 MPa (à température ambiante)/120 degrés C, 450 MPa (à température ambiante)/235 degrés C, 600 MPa (à température ambiante)/425 degrés C, 900 MPa (à température ambiante)/235 degrés C, 900 MPa (à température ambiante)/315 degrés C, 900 MPa (à température ambiante)/650 degrés C, 1 100 MPa (à température ambiante)/235 degrés C, 1 100 MPa (à température ambiante)/730 degrés C et 1 250 MPa (à température ambiante)/600 degrés C — Dimensions

ISO 9609:2016 specifies the dimensions of plain, hexagonal nuts, reduced height, normal across flats, with MJ threads, of classifications: 450 MPa/120 °C, 450 MPa/235 °C, 600 MPa/425 °C, 900 MPa/235 °C, 900 MPa/315 °C, 900 MPa/650 °C, 1 100 MPa/235 °C, 1 100 MPa/730 °C, and 1 250 MPa/600 °C.

NOTE 1 450 MPa, 600 MPa, 900 MPa, 1 100 MPa and 1 250 MPa corresponds to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of a higher strength class.

NOTE 2 120 °C, 235 °C, 425 °C, 315 °C, 650 °C, 730 °C and 600 °C corresponds to the maximum temperature that the nut is able to withstand without permanent alteration to its original characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the surface treatment.

Nuts provided with holes are intended to be used with lockwire in conformity with ISO 245.

ISO 9609:2016 is only applicable for the compilation of aerospace product standards.