Prepared for: [Project Name / Client]
Date: [Current Date]
Standard Reference: EN ISO 13920:1996 — Welding — General tolerances for welded constructions
Symbol reference: BF (Backing / Back weld notation)
Shape and position tolerances
| Nominal Size Range (mm) | Permitted Deviation (Class B) | | :--- | :--- | | 30 to 120 | ± 2 mm | | 120 to 400 | ± 3 mm | | 400 to 1,000 | ± 4 mm | | 1,000 to 2,000 | ± 5 mm | | 2,000 to 4,000 | ± 6 mm | | 4,000 to 8,000 | ± 7 mm | | > 8,000 | ± 8 mm + 0.5 mm per 1,000 mm |
The suffix BF tells the manufacturer exactly which tolerance "bracket" to use for different types of measurements:
This refers to how straight or flat the structure is. Class "F" is a common standard for general engineering, ensuring the final piece isn't so distorted that it won't fit into its designated space. Why it Matters By specifying EN ISO 13920-BF on a drawing, a company like NOVATECH ApS
Prepared for: [Project Name / Client]
Date: [Current Date]
Standard Reference: EN ISO 13920:1996 — Welding — General tolerances for welded constructions
Symbol reference: BF (Backing / Back weld notation)
Shape and position tolerances
| Nominal Size Range (mm) | Permitted Deviation (Class B) | | :--- | :--- | | 30 to 120 | ± 2 mm | | 120 to 400 | ± 3 mm | | 400 to 1,000 | ± 4 mm | | 1,000 to 2,000 | ± 5 mm | | 2,000 to 4,000 | ± 6 mm | | 4,000 to 8,000 | ± 7 mm | | > 8,000 | ± 8 mm + 0.5 mm per 1,000 mm |
The suffix BF tells the manufacturer exactly which tolerance "bracket" to use for different types of measurements:
This refers to how straight or flat the structure is. Class "F" is a common standard for general engineering, ensuring the final piece isn't so distorted that it won't fit into its designated space. Why it Matters By specifying EN ISO 13920-BF on a drawing, a company like NOVATECH ApS
Tell us more and our team of real estate specialists will get in touch!
This quick form takes less than a minute to complete. We only need minimal information to get started.
Your inquiry will be reviewed within 24 hours on business days.