ISO 2320:2015规定了在+10°C至+35°C的环境温度范围内进行试验时，主要扭矩钢螺母的功能特性。它包括一种组合试验方法，用于同时确定主要扭矩特性和扭矩/夹紧力特性。 适用于有效扭矩全金属型螺母和有效扭矩非金属嵌件型螺母: -符合ISO 68-1标准的三角形ISO螺纹； -直径/节距组合符合ISO 261和ISO 262； -粗节螺纹M5至M39或细节螺纹M8×1至M39×3； -螺纹公差符合ISO 965- 2. -机械性能符合ISO 898-2标准； 本标准中规定的主要扭矩值基于实验室试验条件。 注1:实际应用中的实际主要扭矩可能会有所不同。 注2:符合本国际标准要求的所有金属型螺母用于-50°C至+150°C范围内的应用。 注3:符合本国际标准要求的非金属插入式螺母用于-50°C至+120°C范围内的应用。 警告环境温度范围以外的温度可能会影响功能特性（扭矩/夹紧力和主要扭矩特性），见附录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.