It is equally important to recognize what the general tolerances in EN ISO 13920 do not cover. These include:
EN ISO 13920-1:2014 applies to hot-finished structural hollow sections made of non-alloy steel and alloy steel, with or without subsequent heat treatment. The standard is relevant for various types of HSS, including:
is a critical engineering specification that establishes a standardized framework for the general tolerances of welded constructions , explicitly pairing dimensional class B (medium accuracy for linear and angular dimensions) with geometrical class F (standard accuracy for straightness, flatness, and parallelism). This universal quality baseline removes individual engineering drawing clutter while streamlining manufacturing across global supply chains. en iso 13920-bf
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is a specific tolerance designation for welded constructions that combines two different accuracy levels for dimensions and geometry . It is equally important to recognize what the
Disclaimer: Always refer to the latest, official copy of the DIN EN ISO 13920 standard for precise tolerance tables and application rules. If you'd like, I can:
Some key requirements specified in EN ISO 13920-1:2014 include: Disclaimer: Always refer to the latest, official copy
The standard covers the following aspects:
Angular deviations are calculated using the length of the of the angle as the baseline: Length of Shorter Leg ( Class B Permissible Deviation (Degrees & Minutes) Permissible Deviation ( Up to 400 ±20′plus or minus 20 prime ±6plus or minus 6 Over 400 to 1000 ±15′plus or minus 15 prime ±4.5plus or minus 4.5 Over 1000 ±10′plus or minus 10 prime ±3plus or minus 3 Class F: Shape and Position Tolerances
The "BF" combination is widely considered the default baseline for general industrial engineering. It is typically utilized in environments where extreme aerospace precision is unnecessary, but structural sound alignment is critical. Common applications include:
This standard is essential for ensuring consistency and quality in structural steel fabrication when individual tolerances are not specified on a drawing. 1. Breakdown of the "BF" Designation