ISO 16239:2013规定了螺纹测量线的材料、公制系列标称直径、直径公差和名称。 ISO 16239:2013适用于测量ISO通用公制螺纹（M）、统一螺纹（UN）、惠特沃斯管螺纹（G、R）和标准螺距的ISO公制梯形螺纹（Tr）的中径。这些导线用于导程角小于5°的螺纹，主要用于校准螺纹塞规的中径。

ISO 16239:2013 specifies the material, metric series nominal diameters, diameter tolerances, and designation for screw thread measuring wires. ISO 16239:2013 is applicable to measure the pitch diameters of ISO general purpose metric screw threads (M), Unified screw threads (UN), Whitworth pipe threads (G, R), and ISO metric trapezoidal screw threads (Tr) with standard pitches. These wires are intended for use on screw threads with a small lead angle, less than 5°, and mainly used to calibrate the pitch diameters of thread plug gauges.