ISO 8279:1997

Aerospace - Nuts, hexagonal, plain, normal height, normal across flats, with MJ threads, classifications: 600 MPa (at ambient temperature)/120 degrees C, 600 MPa (at ambient temperature)/235 degrees C, 900 MPa (at ambient temperature)/425 degrees C, 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/315 degrees C, 1 100 MPa (at ambient temperature)/650 degrees C, 1 210 MPa (at ambient temperature)/730 degrees C, 1 250 MPa (at ambient temperature)/235 degrees C and 1 550 MPa (at ambient temperature)/600 degrees C - Dimensions

This International Standard specifies the dimensions of plain, hexagonal nuts, normal height, normal across flats, with MJ threads, of classifications: 600 MPa ¹⁾/120 °C²⁾, 600 MPa¹⁾/235 °C²⁾, 900 MPa^l)/425 °C²⁾. 1100 MPa¹⁾/235 °C²⁾, 1100 MPa¹⁾/315 °C²⁾, 1100 MPa¹⁾/650 °C²⁾, 1210 MPa¹⁾/730 °C²⁾, 1250 MPa¹⁾/235 °C²⁾ and 1550 MPa¹⁾/600 °C²⁾.

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

This International Standard is only applicable for the compilation of aerospace product standards.

1) 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.

2) 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 material or by the surface treatment.