Iso 13920-bf: En

The ISO 13920 standard specifies general tolerances for linear and angular dimensions, as well as for shape and position of welded structures. It is designed to ensure functional suitability in manufacturing without requiring excessive precision that could increase costs unnecessarily. Breaking Down "BF"

Understanding these codes ensures that fabricators aren't over-engineering parts and that clients receive products that fit their structural requirements without unnecessary expense. en iso 13920-bf

| Nominal Size (mm) | Permitted Flatness Deviation (Class B) | | :--- | :--- | | Up to 120 | 1 mm | | 120 to 400 | 1.5 mm | | 400 to 1,000 | 2 mm | | 1,000 to 2,000 | 2.5 mm | | 2,000 to 4,000 | 3 mm | | 4,000 to 8,000 | 4 mm | | > 8,000 | 5 mm | The ISO 13920 standard specifies general tolerances for

: Often paired with ISO 2768-mK (which covers tolerances for machined parts) to provide a complete specification for assemblies that include both welded and machined features. | Nominal Size (mm) | Permitted Flatness Deviation

The standard uses a letter-code system to define four distinct tolerance classes. The code is actually a combination of two separate tolerance categories.