For steel welds, the numerical limits are almost identical. However, ISO 5817 introduces new imperfection types (e.g., root concavity, mismatch) that DIN 8570-B did not explicitly cover. Therefore, directly substituting the standard without a technical review is not advisable.

Simplification of drawings by removing the need for individual tolerance specifications for every dimension.

When drawing callouts specify "DIN 8570 B" (or more accurately, a class code containing 'B'), they are referring to a specific .

ISO 13920 Welding General tolerances for welded constructions

Medium (Standard engineering requirements, most commonly used) C: Coarse (Lower accuracy, larger allowable deviations)

Choosing the correct class is a balance between functional necessity and production cost.

Instead of flooding a CAD file with individual numeric variances, a designer can note in the title block. This drastically decreases drawing preparation times. 2. Balanced Manufacturing Costs

: Offers historical and superseded versions if you specifically need the 1987 text. 18;write_to_target_document7;default0;c25;18;write_to_target_document1a;_TwvuaaGfMc-O4-EPja-ciAo_20;2a; Implementation on Drawings 0;16;

DIN 8570 is a German standard established by the Deutsches Institut für Normung (German Institute for Standardization). It specifies general tolerances for welded structures, covering linear dimensions, angular dimensions, and form/position (such as straightness, flatness, and parallelism). The standard is divided into two primary parts:

It is a German national standard titled "General tolerances for welded structures; linear and angular dimensions" (Allgemeintoleranzen für Schweißkonstruktionen; Längen- und Winkelmaße). It specifies general tolerances for linear and angular dimensions on engineering drawings for welded components. If specific tolerances are not indicated on a drawing, this standard defines the permitted deviations. This allows fabricators to work efficiently within defined, customary workshop accuracies.

| Source | Format | Price (approx.) | Legitimacy | |--------|--------|----------------|-------------| | Beuth Verlag (Archive Service) | PDF scan | €92.50 | ✅ High – Official DIN outlet | | S&P Global (formerly IHS) | Digital scan | $80.00 | ✅ High | | Techstreet (Wiley) | PDF | $75.00 | ✅ High | | University library interlibrary loan | Physical copy or scan | €15 (admin fee) | ✅ Medium (for research only) |

This standard simplifies technical drawings by providing default permissible deviations when specific tolerances aren't listed for a weldment.

Linear and angular dimensions where no specific tolerance is given. The "B" Class:

By standardizing your operations around DIN 8570 B / ISO 13920 B, you guarantee a baseline of structural integrity and precision that satisfies international engineering audits. Share public link

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Quality level B is expensive. Understanding the limits helps fabricators avoid over-inspecting or requiring unnecessary repairs. Choosing the right quality level (B, C, or D) balances safety with manufacturing efficiency.

Many engineering drawings and welding procedure specifications (WPS) explicitly cite . If you are fabricating for German or European markets, your customer may require compliance with this standard.