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The number represents the "International Tolerance" (IT) grade. It defines the size of the tolerance band. The smaller the number, the tighter (more precise) the tolerance.

Why interesting? In , using ISO 286 , if a drawing says ⌀25 H7/g6 :

Two foundational standards govern most mechanical engineering applications:

((full)) — Iso Tolerance Standards

The number represents the "International Tolerance" (IT) grade. It defines the size of the tolerance band. The smaller the number, the tighter (more precise) the tolerance.

Why interesting? In , using ISO 286 , if a drawing says ⌀25 H7/g6 : iso tolerance standards

Two foundational standards govern most mechanical engineering applications: using ISO 286