However, it is not a magic wand. Always ask yourself: “If this dimension drifts by 0.2mm, will my assembly fail?” If the answer is yes, add a specific tolerance (e.g., 10.0 ±0.01mm ) directly next to that dimension.
Refers to ISO 2768-2 , covering geometrical tolerances (straightness, flatness, perpendicularity, and symmetry). Why Use ISO 2768-mK? general tolerance iso 2768-mk
Tighter tolerances (like ISO 2768-f) can be 2 to 2.5 times harder and more expensive to machine. The "mK" class offers a sweet spot between precision and production speed. However, it is not a magic wand