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.
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.
Le présent document spécifie les caractéristiques mécaniques particulières et les performances des écrous autofreinés en acier, essayés dans une plage de température ambiante comprise entre +10°C et +35°C. Il définit un essai destiné à déterminer les caractéristiques d'autofreinage (caractéristiques fonctionnelles) et/ou les caractéristiques couple/tension dans les conditions d'essai spécifiées par la NF EN ISO 16047.
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