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About This Item

 

Full Description

This International Standard specifies the mechanical and performance properties for prevailing torque type steel hexagon nuts (including those with flange) when tested over an ambient temperature range of 10 °C to 35 °C. Properties will vary at higher and lower temperature.

It applies to prevailing torque type nuts

  • with nominal thread diameters up to and including 39 mm;
  • of triangular ISO thread according to ISO 68;
  • with diameter/pitch combinations according to ISO 261;
  • with thread tolerances 6H according to ISO 965-2;
  • with specific mechanical requirements;
  • with dimensions as specified in product standards provided they make reference to this International Standard;
  • within the temperature range −50 °C to +300 °C for all metal type nuts;
  • within the temperature range −50 °C to +I20 °C for non-metallic insert type nuts".

It does not apply to nuts requiring special properties which may require special materials or coatings to improve

  • weldability;
  • corrosion resistance;
  • performance outside the above specified temperature ranges.

Prevailing torque performance decreases with increasing re-use. The nut user should consider the implications of decreased performance prior to re-use.

 

Document History

  1. ISO 2320:2015


    Fasteners - Prevailing torque steel nuts - Functional properties

    • Most Recent
  2. ISO 2320:2008


    Prevailing torque type steel nuts - Mechanical and performance properties

    • Historical Version
  3. ISO 2320:1997

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    Prevailing torque type steel hexagon nuts - Mechanical and performance properties

    • Historical Version
 

Amendments, rulings, supplements, and errata

  1. ISO 2320/Cor1:2006

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    Prevailing torque type steel hexagon nuts - Mechanical and performance properties - Corrigendum