The standard uses a letter-code system to define four distinct tolerance classes. The code is actually a combination of two separate tolerance categories.
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.
Under Class B, the permitted deviations for lengths, widths, and heights scale directly with the nominal size of the weldment. Smaller parts require higher accuracy, while larger assemblies are allowed more breathing room to accommodate cumulative weld shrinkage. Range of Nominal Sizes Class B Permitted Tolerance (mm) ±1plus or minus 1 Over 30 up to 120 ±2plus or minus 2 Over 120 up to 400 ±2plus or minus 2 Over 400 up to 1,000 ±3plus or minus 3 Over 1,000 up to 2,000 ±4plus or minus 4 Over 2,000 up to 4,000 ±6plus or minus 6 Over 4,000 up to 8,000 ±8plus or minus 8 Over 8,000 up to 12,000 ±10plus or minus 10 Over 12,000 up to 16,000 ±12plus or minus 12 Over 16,000 up to 20,000 ±14plus or minus 14 Over 20,000 ±16plus or minus 16 (Data sourced from ISO 13920 Workshop Guidelines ) Angular Dimension Tolerances (Class B) en iso 13920-bf
If you are a design engineer, using this standard correctly will save your workshop hours of confusion.
This post breaks down the EN ISO 13920 standard, specifically focusing on the tolerance class, to help you understand when to use it and how to apply it. The standard uses a letter-code system to define
Rigidly clamping workpieces to a heavy welding table mechanically restricts components from warping during cooling.
The use of EN ISO 13920-1:2014 provides several benefits, including: The standard is part of the ISO 13920
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: Represents the tolerance class for linear and angular dimensions . Class B is considered "medium" or "customary workshop accuracy".