ISO 2338 Stainless Steel Dowel Pins | Sheng Fong Precision ISO 2338 is an international standard for unhardened parallel pins (Parallel Pins, Unhardened). In practical applications and supplier catalogs, it is often compared alongside the German DIN 7 standard. However, the two are not completely identical. ISO 2338 measures length end-to-end (including chamfers), while DIN 7 nominal length excludes the end form, meaning the actual total length may be 0.3–8.0 mm longer than t