标准摘要
[中文适用范围]： ISO 7 的这一部分规定了使用极限量规的过程，用于验证管道系统组件和其他产品上的锥度内螺纹和外螺纹以及平行内螺纹，其尺寸和公差在 ISO 7-1 中有详细说明。 如果没有特殊的预防措施，所描述的测量系统可能不适合测量注塑塑料工件上的螺纹。 ISO 7 的这一部分并未完全涵盖全面控制螺纹质量和尺寸所需的所有要求。 需要对工具和设备进行额外控制以及生产过程中的目视检查，以确保完全符合 ISO 7-1，例如内螺纹工件上的有用螺纹长度应通过直接测量来检查。 附录 A 总结了 ISO 7 本部分中包含的量规，以及每个量规控制的螺纹元件的详细信息和量规标识号。 如果对是否符合 ISO 7-1 的要求存在争议，则应将 ISO 7 这部分中的量规视为其控制工件上的螺纹元件的决定性因素。 [外文原描述]： This part of ISO 7 specifies a process using limit gauges, for the validation of taper internal and external threads and parallel internal threads on piping systems components and other products, the dimensions and tolerances of which are detailed in ISO 7-1. The gauging system described may not be suitable, without special precautions, for gauging of threads on injection moulded plastic workpieces. This part of ISO 7 does not cover completely all the requirements necessary for full control of thread quality and dimensions. Additional control of tools and equipment and visual inspection during production are required to ensure complete compliance with ISO 7-1, for example the length of useful thread on internally threaded workpieces should be checked by direct measurement. Annex A gives a summary of the gauges included in this part of ISO 7, together with details of the thread elements controlled by each gauge and gauge identification numbers. In the event of a dispute over compliance with the requirements of ISO 7-1, the gauges in this part of ISO 7 are to be considered as decisive for the thread elements which they control on the workpiece.
英文名称Pipe threads where pressure-tight joints are made on the threads — Part 2: Verification by means of limit gauges