En Iso 13920-bf [work] »
for Class B and F. Compare Class BF with other classes like CE or AE. Discuss how this standard impacts the cost of fabrication.
The component of EN ISO 13920-BF ensures that the final geometry of the assembly does not twist or bow excessively out of shape. These metrics dictate the maximum gap allowed between the surface of the weldment and a perfect reference plane or straightedge. Over 30 up to 120 mm : Maximum deviation of Over 120 up to 400 mm : Maximum deviation of Over 400 up to 1,000 mm : Maximum deviation of Over 1,000 up to 2,000 mm : Maximum deviation of Over 2,000 up to 4,000 mm : Maximum deviation of Over 4,000 up to 8,000 mm : Maximum deviation of Practical Implementation in Engineering Drawings
is more than just a label on an engineering drawing; it is a critical specification that defines the expected quality and precision of a welded structure. By referencing the B dimension and F shape tolerances, it provides a clear, internationally accepted language between all parties involved in fabrication. Understanding the meaning of "BF" and the associated numerical limits is essential for engineers, designers, inspectors, and fabricators aiming to produce safe, reliable, and cost-effective welded products that meet global industry standards.
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The permissible deviation for angles, expressed both in angular units (degrees and minutes) and as a linear deviation per unit length (mm/m). The linear values are calculated based on the length of the shorter leg of the angle, providing a practical method for measurement.
Specifying acceptable deviation limits on drawings.
: Filtration distributors and cable attachment flanges. for Class B and F
Selecting targets a customary, high-quality workshop precision profile that does not require secondary machining. The "F" Precision Value (Form and Position)
| Class | Typical use | |-------|--------------| | | Fine – machined parts, precise jigs | | D | Medium – general structural steelwork | | E | Coarse – large fabrications, shipbuilding | | F | Very coarse – flame-cut plates, heavy beams |
| | EN ISO 13920 Tolerance Class B: Limit Deviation (± mm) | | :--- | :--- | | 2 to 30 | ± 2 | | >30 to 120 | ± 2 | | >120 to 400 | ± 3 | | >400 to 1000 | ± 4 | | >1000 to 2000 | ± 6 | | >2000 to 4000 | ± 8 | | >4000 to 8000 | ± 10 | | >8000 to 12000 | ± 12 | | >12000 to 16000 | ± 14 | | >16000 to 20000 | ± 16 | | >20000 | As agreed upon between parties. | The component of EN ISO 13920-BF ensures that
Understanding these codes ensures that fabricators aren't over-engineering parts and that clients receive products that fit their structural requirements without unnecessary expense.
To truly understand "EN ISO 13920-BF," you must know the numbers. Below are the key tolerance ranges for (Medium).
If you are operating under Class B, you must consult the tables within the ISO 13920 standard.
