ISO 4231:2016是对ISO 2568和ISO 4230的补充，并根据ISO 228-1规定了用于生产G系列平行管螺纹的手动和机械操作圆形螺纹模的尺寸。 这些模具的一般尺寸（直径、厚度和固定尺寸）符合ISO 2568，以便在该文件中定义的模座的帮助下驱动手动模具。

ISO 4231:2016 is a supplement to ISO 2568 and ISO 4230 and specifies the dimensions of hand- and machine-operated circular screwing dies intended for production of parallel pipe threads, G series, in accordance with ISO 228？1. The general dimensions of these dies (diameter, thickness and fixing dimensions) are in accordance with ISO 2568 so as to permit the driving of hand-operated dies with the aid of the die stocks defined in that document.