En Iso 13920-bf

In the world of structural steel engineering and fabrication, precision is everything. However, absolute perfection is impossible to achieve in welding due to thermal distortion, material inconsistencies, and human factors. This is where tolerance standards come into play.

Specifying is a clear signal to the fabrication floor: "Build this with standard professional care." It eliminates the need for individual tolerance notes on every single weld, streamlining the design process and ensuring that everyone from the engineer to the quality inspector is on the same page regarding what "good enough" looks like.

| Tolerance | Class C | Class D | Class E | Class F | |-----------|---------|---------|---------|---------| | Linear (e.g., length) | ±1.5 | ±2.5 | ±4 | ±6 | | Flatness per 1000 mm | 1.5 | 3 | 6 | 12 | | Angular (mm/m) | 3 mm/m | 6 mm/m | 12 mm/m | 20 mm/m |