ISO 12273:1997

Aerospace - Nuts, anchor, self-locking, floating, self-aligning, two lug, with MJ threads, classifications: 900 MPa (at ambient temperature)/235 degrees C, 900 MPa (at ambient temperature)/315 degrees C and 900 MPa (at ambient temperature)/425 degrees C - Dimensions

This International Standard specifies the dimensions of floating, self-aligning, two lug anchor nuts, with MJ threads and a self-locking feature achieved by forming the upper portion out-of-round, of classifications: 900 MPa ¹⁾/235 °C²⁾, 900 MPa ¹⁾/315 °C ²⁾ and 900 MPa ¹⁾/425 °C²⁾.

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 maxim-urn temperature is conditioned by the material or by the surface treatment.