DIN regulates German standards for a variety of parts and industries, but its first standard – published in 1918, according to the DIN Timeline – regulated the manufacturing of taper pins. As the organization grew, it encompassed a wider range of standards with a focus on quality assurance. It joined ISO in 1961 after establishing itself as a leading voice in European standards.

DIN 6325 Dowel Pins are headless parallel pins hardened and ground to a precise diameter. One end is chamfered 15° and radiused to aid with insertion while the other end is radiused.

Furnished in Tolerance Class m6 (oversized) and precision h6 (undersized), the “limit deviations”-also called the “tolerance zone”-varies by diameter. As an example, the diameter of an M5 m6 pin is +0.004 to +0.012 mm but an M5 h6 tolerance pin varies by only 0.008 mm instead of 0.016 mm: 0 to -0.008 mm. All pins are plain finish steel and are therefore not impervious to rust. DIN 6325 Hardened Dowel Pins are similar to ISO 8734.