Since DIN 8570 is withdrawn, you can get the equivalent limits from:
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is an older German technical standard that specifies general tolerances for welded structures
. While widely cited in engineering drawings, it is important to note that it has been largely superseded by DIN EN ISO 13920 Overview of DIN 8570 "Class B"
The "B" in "DIN 8570 B" typically refers to one of the four tolerance classes (A, B, C, and D) defined in the standard. Class B (Medium Accuracy)
: This class represents a "coarse" or "customary workshop accuracy" level for linear and angular dimensions. Application
: It is used to simplify technical drawings by providing default permissible variations for weldments without the need to indicate every individual tolerance. Dimensions Covered
: The standard applies to external and internal dimensions, center line distances, and angular dimensions (including right angles). Key Sections of the Standard din 8570 b pdf
The standard is divided into parts that address different types of tolerances: DIN 8570-1 : Focuses on linear and angular dimensions DIN 8570-2/3 : Focuses on geometrical tolerances , including straightness, flatness, and parallelism. Intertek Inform Modern Equivalent Din 8570-1987 | PDF | Engineering Tolerance - Scribd
DIN 8570-B refers to a specific tolerance class within the DIN 8570 standard (General tolerances for welded structures). This standard simplifies technical drawings by providing universal permissible variations for linear and angular dimensions, as well as shape and position, based on customary workshop accuracy.
Class B specifically represents one of four primary tolerance grades (A, B, C, and D) used for linear and angular measurements. While it is a moderately accurate class, it has largely been superseded by the international standard ISO 13920. Understanding DIN 8570 Tolerance Classes
The standard is divided into sections to cover different types of measurements. The designation DIN 8570-B indicates that the general tolerances for linear and angular dimensions follow class B.
Linear Dimensions: Class B provides specific +/- deviations in millimeters based on the nominal size of the structure. For example, for measurements up to 30mm, the tolerance is ±1mm; for ranges between 400mm and 1000mm, it increases to ±3mm.
Angular Dimensions: Tolerances for angles are determined by the length of the shorter leg of the angle. Class B typically allows for deviations such as ±45' for shorter legs or ±20' for longer reference legs (over 1000mm). Transition to ISO 13920
If you are searching for a DIN 8570 B PDF, it is critical to note that this German national standard was officially withdrawn and replaced by ISO 13920:1996. Most modern engineering projects now cite the international version. DIN 8570 (Superseded) ISO 13920 (Current) Scope General tolerances for welded structures International standard for welding tolerances Linear Classes A, B, C, D A, B, C, D Shape/Position Classes E, F, G, H E, F, G, H Status Active/Maintained Why Use Tolerance Class B? Since DIN 8570 is withdrawn, you can get
The choice of tolerance class B is usually a balance between functional requirements and manufacturing economy.
Workshop Accuracy: It reflects standard manual or semi-automated welding capabilities without requiring high-precision specialized tooling.
Indication on Drawings: To apply this class, a designer would enter "DIN 8570-B" (or the ISO equivalent) in the drawing's title block, removing the need to dimension every single weld individually.
Combinations: If a structure requires specific precision for shape (like flatness) but standard precision for length, a combined designation like DIN 8570-BE might be used. Accessing the Standard
Official copies of these standards, including the historical DIN versions and current ISO equivalents, are available through authorized distributors: General Tolerances for Welded Structures | PDF - Scribd
Acquire a licensed archival copy of DIN 8570:1993-12 (the last harmonized version). Ensure it includes both the text and the original tables.
Send the customer a written deviation request (RFI): “DIN 8570 is withdrawn
“DIN 8570 is withdrawn. We propose using ISO 5817:2023, Quality Level C, which provides equivalent limits for all applicable imperfection types. No change in acceptance quality is expected.”
Once signed, you can stop searching for the old PDF.
To understand the “B,” you first need the structure:
| Standard | Title | What it covers | | --- | --- | --- | | DIN 8570-1 | Shape deviations on welded structures | Tolerances for angularity, straightness, flatness, and parallelism. | | DIN 8570-2 | Weld imperfections – Quality levels | Detailed classification of cracks, pores, undercuts, and incomplete penetration. |
Form B comes from Part 2 (weld imperfections). Sometimes, you’ll also see references to:
When someone searches for a “DIN 8570 B PDF,” they almost always need the weld quality level tables from Part 2.
False. Pressure vessel codes (e.g., AD 2000, ASME VIII) have their own weld imperfection limits. They may reference DIN 8570 only for non-pressure attachments.
False. The standard was designed for unalloyed and low-alloy steels (up to 1% carbon) and aluminum alloys. It does not cover stainless steels, nickel alloys, or titanium.