En Iso 13920-bf !!install!! Jun 2026

If that same beam has a flatness requirement:

Tolerances for lengths, such as external sizes, internal sizes, and step sizes. Range of nominal sizes (mm) Tolerance (mm) ±1plus or minus 1 ±2plus or minus 2 120 to 400 ±2plus or minus 2 400 to 1000 ±3plus or minus 3 1000 to 2000 ±4plus or minus 4 2000 to 4000 ±6plus or minus 6 2. Shape and Position (Class F) Tolerances for straightness, flatness, and parallelism. Range of nominal sizes (mm) Tolerance (mm) Up to 1000 1000 to 2000 2000 to 4000 4000 to 8000 Application in Industry This standard is commonly cited in technical drawings for: 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. If that same beam has a flatness requirement:

| Nominal Angle Leg Length (mm) | Permitted Deviation (Class B) | | :--- | :--- | | Up to 400 | ± 30 minutes (± 0.5°) | | 400 to 1,000 | ± 20 minutes (± 0.33°) | | Over 1,000 | ± 15 minutes (± 0.25°) | Range of nominal sizes (mm) Tolerance (mm) Up

Q: What is the difference between EN ISO 13920-BF and other tolerance standards? A: EN ISO 13920-BF is specifically designed for welded constructions and parts, providing guidelines for the tolerancing of welded joints and assemblies.

The actual permissible deviation (in millimeters or degrees) depends on the of the part. For example, a 1,000 mm beam in Class B will have a specific allowed variation, whereas a 10,000 mm beam will have a larger allowable margin. Type of Measurement Class for "BF" Key Focus Areas Linear Dimensions B (Medium) Length, width, and height of parts. Angular Dimensions B (Medium) Deviations in angles and slopes. Shape & Position F (Medium) Straightness, flatness, and parallelism . Testing and Verification

Fabricate a welded steel frame, 2000 mm long, with a backing run on the main butt joint.