ISO 13920 tolerances
ISO 13920 tolerances – interactive engineering module focused on ISO 13920 welding tolerances. Learning format: Standards guide · Active learning. Explains the principle, technical relationships and practical use.
Topic overview
The standard provides general tolerances for weldments using four classes for linear/angular dimensions and four classes for shape/position. Class selection follows function, not a desire for “maximum precision”, and applies only where the drawing does not state an individual requirement.
Are the selected classes functionally justified, achievable by the fabrication process and unambiguously measurable in a defined product condition?
The actual limit is read from the table for the class and dimensional range.
Assembly- or safety-critical features need individual tolerances.
What the module covers
- Weldment tolerances according to EN ISO 13920:2023
- 1. Tolerance-class logic
- 2. Practical use of EN ISO 13920:2023
- 3. Typical conflicts
- Drawing and inspection checklist
- Practical rule
Related engineering terms
The module connects these terms with practical engineering explanations:
Continue with the practical module.
Open this topic directly in the interactive WeldScope portal.