ISO 12268:1997 PDF

This International Standard specifies the dimensions of plain, hexagonal nuts, reduced height, reduced across flats. with MJ threads, of classifications: 450 MPa¹⁾/425 C²⁾, 600 MPa¹⁾/235 C²⁾, 600 MPa¹⁾315 C²⁾, 600 MPa¹⁾650 C²⁾, 900 MPa¹⁾235 C²⁾, 900 MPa¹⁾730 C²⁾ and 1100 MPa¹⁾/GOO 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.