Din 6885 H7 H9 Tolerances le H9 allows for a larger clearance, influencing the fit between the key and the keyway. How do DIN 6885 H7 and H9 tolerances affect the fit of a parallel key? H7 tolerance results in a closer fit with less play, suitable for precise and high-load applications; H9 tole D Darrion Hane May 14, 2026