BS EN ISO 2320:2015规定了以下情况下常用扭矩钢螺母的功能特性: 在+10°C至+35°C的环境温度范围内进行试验。它包括一种用于 同时确定主要扭矩特性和扭矩/夹紧力特性。适用于大扭矩全金属螺母和大扭矩非金属嵌件螺母:符合ISO 68-1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；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:所有符合本国际标准要求的金属型螺母均用于 应用范围从-50°C到+150°C。注3:使用符合本国际标准要求的非金属插入式螺母 在-50°C至+120°C的应用中。警告-环境温度范围之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。交叉引用:ISO 273ISO 898-1ISO 898-2ISO 965-2ISO 16047:2005 ISO 68-1ISO 261ISO 262购买本文件时可获得的所有当前修订版均包含在购买本文件中。

BS EN 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.Cross References:ISO 273ISO 898-1ISO 898-2ISO 965-2ISO 16047:2005ISO 68-1ISO 261ISO 262All current amendments available at time of purchase are included with the purchase of this document.