- DIN EN ISO 21920-1 replaces DIN EN ISO 1302
- DIN EN ISO 21920-2 and -3 replace DIN EN ISO 4287, 4288 and 13565-1, -2 and -3
The most important modifications to the new profile standards:
- New symbol for the specification
- The maximum value tolerance acceptance rule (Tmax) generally applies.
- As a rule, there is no difference between periodic and aperiodic profiles when selecting the nesting index (cut-off).
- The default settings are based on the drawing entry.
- If not specified otherwise, surface imperfections and surface damage must be taken into consideration as part of the evaluation.
- Modification to some terms,
e.g. nesting index (instead of cut-off).