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The feature is a combined designation for general tolerances in welded constructions. It specifies an accuracy level for both dimensional and geometric variations on technical drawings. The designation breaks down as follows:
In the world of engineering and manufacturing, precision and accuracy are crucial for ensuring the quality and reliability of products. One of the key aspects of achieving this precision is by adhering to specific standards and guidelines that dictate the acceptable limits of variation in the dimensions and tolerances of various components and constructions. One such standard that plays a significant role in the fabrication and inspection of welded constructions and parts is EN ISO 13920-BF. en iso 13920-bf
"EN ISO 13920-B, BUT FLATNESS OF MOUNTING FACE F1 (reference surface) TO BE HELD TO CLASS A (±0.5 mm)" The feature is a combined designation for general
The standard is broken down into three main data tables that engineers use to check compliance: One of the key aspects of achieving this
Class F defines the allowable variation for the shape and position of the structure. Common tolerances for Class F include: +1 mm. Over 120 to 400 mm: +1.5 mm. Over 400 to 1,000 mm: +3 mm. 4. Why Use EN ISO 13920-BF?
| Nominal Size (mm) | Permitted Deviation (Class B) | | :--- | :--- | | Up to 120 | 1 mm | | 120 to 400 | 2 mm | | Over 400 | 3 mm |
Among the five tolerance classes, is the most commonly specified. Here is why manufacturers prefer it over finer classes like A or coarser classes like D: