En Iso 13920-bf __top__ 🎯

This standard applies to welded structures made from:

The standard divides tolerances into four classes: en iso 13920-bf

In simple terms: It tells you how much a welded part can deviate from the drawing before it is considered "out of spec." This standard applies to welded structures made from:

The designation "BF" is a combination of two separate tolerance classifications defined within the standard. To understand EN ISO 13920-BF, we must break it down into its component parts: and Class F . 8000 to 12000 | 6.0 |

To be ISO-compliant, use the following method in your title block or a general note:

| Class | Relative Cost Factor | Typical Rework Rate | | :--- | :--- | :--- | | | 1.5x – 2.0x | 15% (often requires machining) | | B (Medium) | 1.0x (baseline) | 5% (minor straightening) | | C (Coarse) | 0.7x | 1% (almost never fails) |

| Nominal Size Range (mm) | Tolerance for Class B (± mm) | | :--- | :--- | | Up to 30 | 0.5 | | >30 to 120 | 1.0 | | >120 to 400 | 1.5 | | >400 to 1000 | 2.0 | | >1000 to 2000 | 3.0 | | >2000 to 4000 | 4.0 | | >4000 to 8000 | 5.0 | | >8000 to 12000 | 6.0 |