ISO 8239规定了针和针座的装配尺寸。它定义了缝纫机针的通用术语，并规定了针座中针的配合公差。除了标称柄直径和从枪托到枪眼的长度的尺寸范围外，ISO 8239还指出了这两个尺寸的首选组合。为了确保互换性并减少针的种类，在设计新的缝纫机和/或缝纫机针时，这些应作为指南。

ISO 8239 specifies the fitting dimensions of needles and needle holders. It defines general terms for sewing machine needles and specifies the tolerances for their fit in the needle holder. In addition to the rangers of dimensions for the nominal shank diameter and the length from butt to eye, ISO 8239 also indicates the preferred combinations of these two dimensions. In order to ensure the interchangeability and to reduce the variety of needles these should serve as a guide when designing new sewing machines and/or sewing machine needles.