: It provides a clear benchmark for what is considered an acceptable "standard" build in industrial fabrication.
| 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°) | en iso 13920-bf
Would you like the dimensional tables for Classes C–F, or the detailed ISO 9692-1 BF preparation sketch? : It provides a clear benchmark for what
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 For example, a 1,000 mm beam in Class
If you have ever seen the designation on a technical drawing or a quote, you know it dictates the quality acceptance criteria. But what does it actually mean?
EN ISO 13920-BF is a European standard that specifies general tolerances for welded constructions and parts. The standard is part of the ISO 13920 series, which provides guidelines for the tolerancing of welded parts and assemblies. The "BF" in the designation refers to the specific part of the standard that deals with general tolerances for welded constructions.
is a technical specification used in engineering drawings to define general tolerances for welded constructions . It ensures that parts are manufactured to a consistent, economically viable level of precision without requiring individual tolerances for every dimension. Breakdown of the Specification