En Iso 13920-bf -

If you’ve recently seen a drawing with “EN ISO 13920-BF” in the title block, you might have wondered: What does the “BF” mean, and how does it affect my shop floor?

In the world of welding and metal fabrication, precision isn't just a goal—it’s a necessity. But achieving "perfect" measurements on every single weldment is neither practical nor cost-effective. That’s where EN ISO 13920 comes in. en iso 13920-bf

Let’s break it down. EN ISO 13920 is the international standard for General Tolerances for Welded Constructions . It replaces older national standards (like DIN 8570 in Germany) and provides a unified system for tolerancing linear dimensions, angular dimensions, straightness, flatness, and parallelism. If you’ve recently seen a drawing with “EN

| Nominal Dimension Range | Linear Tolerance (± mm) | |------------------------|------------------------| | Up to 30 mm | 0.5 mm | | 30 – 120 mm | 0.8 mm | | 120 – 400 mm | 1.2 mm | | 400 – 1000 mm | 2.0 mm | | 1000 – 2000 mm | 3.0 mm | That’s where EN ISO 13920 comes in