BS EN ISO 4231:2016是ISO 2568和ISO 4230的补充，规定了 用于生产平行管螺纹的手动和机械操作的圆形螺纹模具， G系列，符合ISO 228-1。这些模具的一般尺寸（直径、厚度和固定尺寸）符合 符合ISO 2568的要求，以允许借助中定义的模座驱动手动模具 那份文件。交叉引用:ISO 228-1ISO 2568ISO 4230ISO 13399购买本文件时提供的所有现行修订版均包含在购买本文件中。

BS EN 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.Cross References:ISO 228-1ISO 2568ISO 4230ISO 13399All current amendments available at time of purchase are included with the purchase of this document.