The wording on your technical drawing is critical. If done incorrectly, the manufacturer may default to a different standard (like DIN or JIS) or ignore the note entirely.
When you specify on a drawing, you are instructing the manufacturer that: iso 2768 fk
| | Permissible Deviation (± mm) | | --- | --- | | 0.5 up to 3 | ± 0.05 | | >3 up to 6 | ± 0.05 | | >6 up to 30 | ± 0.10 | | >30 up to 120 | ± 0.15 | | >120 up to 400 | ± 0.20 | | >400 up to 1000 | ± 0.30 | | >1000 up to 2000 | ± 0.50 | | >2000 up to 4000 | ± 0.80 | The wording on your technical drawing is critical
In the context of ISO 2768, the letters FK refer to a specific variant of the standard. The FK variant represents a set of general tolerances for linear dimensions, which are defined as follows: The FK variant represents a set of general
The designation specifies two distinct classes of precision: