En Iso 13920-bf _verified_ Jun 2026

Thus, – it likely means: Use ISO 13920 (unspecified class, usually Class D or E) + BF weld prep (ISO 9692-1).

(lengths and angles). Class B is generally considered "medium" or standard workshop accuracy. : Refers to the tolerance class for shape and position en iso 13920-bf

| Term | Standard | Meaning | |------|----------|---------| | | ISO 13920 | General tolerances for welded constructions | | Class C, D, E, F | ISO 13920 | Tolerance grades (C finest → F coarsest) | | BF | ISO 9692-1 | Butt weld preparation with Backing + Flat root face | | EN ISO 13920-BF | Invalid combo | Likely means: Tolerance Class F + Weld prep BF | Thus, – it likely means: Use ISO 13920

The next time you see "EN ISO 13920-BF" on a blueprint, you will know exactly what the welder can and cannot deliver. Use this knowledge to design smarter, fabricate faster, and inspect fairly. : Refers to the tolerance class for shape

You will most often see this code on technical drawings for: : Large structural steel assemblies. High Voltage Equipment : Such as corona rings and shields.