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Full Description

ISO 2320:2015 specifies the functional properties for prevailing torque steel nuts when tested at an ambient temperature range of +10 °C to +35 °C. It includes a combined test method to determine the prevailing torque properties and the torque/clamp force properties at the same time.

It applies to prevailing torque all metal type nuts and prevailing torque non-metallic insert type nuts:

- with triangular ISO thread in accordance with ISO 68-1;

- with diameter/pitch combination in accordance with ISO 261 and ISO 262;

- with coarse pitch thread M5 to M39 or with fine pitch thread M8 - 1 to M39 - 3;

- with thread tolerances in accordance with ISO 965-2;

- with mechanical properties in accordance with ISO 898-2;

Prevailing torque values specified in this standard are based on laboratory test conditions.

NOTE 1 Actual prevailing torques in practical application can vary.

NOTE 2 All metal type nuts conforming to the requirements of this International Standard are used in applications ranging from −50 °C to +150 °C.

NOTE 3 Non-metallic insert type nuts conforming to the requirements of this International Standard are used in applications ranging from −50 °C to +120 °C.

WARNING - Temperatures outside the ambient temperature range can influence the functional properties (torque/clamp force and prevailing torque properties), see Annex A.

 

Document History

  1. ISO 2320:2015

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    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


    Prevailing torque type steel hexagon nuts - Mechanical and performance properties

    • Historical Version