Class B is the most frequently specified tolerance class because it represents the optimal balance between manufacturing cost and structural integrity.
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.
👋 Are you still using DIN 8570 for your welding tolerances? If you’ve ever come across DIN 8570 B
This article is for informational purposes only. Always consult the official standard document for legal and contractual use. din 8570 b pdf
ACTUAL DISTORTED PROFILE /-------------------------\ ___ Allowed Deviation / \ | (e.g., max 2mm variance) =============================== === NOMINAL STRAIGHT PATH The Global Transition: DIN 8570 to EN ISO 13920
| | Over up to 30 mm | Over 30 to 120 mm | Over 120 to 400 mm | Over 400 to 1000 mm | Over 1000 to 2000 mm | Over 2000 to 4000 mm | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | A | ±1 mm | ±1 mm | ±2 mm | ±3 mm | ±4 mm | ±5 mm | | B | ±1 mm | ±2 mm | ±3 mm | ±4 mm | ±6 mm | ±8 mm | | C | ±2 mm | ±3 mm | ±4 mm | ±6 mm | ±8 mm | ±11 mm | | D | ±4 mm | ±6 mm | ±8 mm | ±11 mm | ±14 mm | ±18 mm |
For Class B, the angular variances are restricted based on the nominal length in millimeters per meter of length: Class B is the most frequently specified tolerance
After the 1987 version, the standard was withdrawn and officially replaced by the international standard (Welding — General tolerances for welded constructions — Dimensions for lengths and angles — Form and position). This ISO standard is the definitive, current document.
The standard provides general tolerances for the linear and angular dimensions, shape, and position of welded structures. It is largely equivalent to the international standard ISO 13920 . Key Details of DIN 8570 Class B
Many torrent or document-sharing sites claim to offer the . These are often: 👋 Are you still using DIN 8570 for
In the world of metal fabrication and welding, precision is paramount. While detailed technical drawings often specify tolerances for critical dimensions, many features—such as overall length, angularity, and structural alignment—remain un-toleranced. This is where comes into play.
If you have searched for the term , you are likely facing a specific challenge: You need to classify, assess, or accept weld imperfections on a fabricated component, and the contractual drawing calls out “DIN 8570-B” as the acceptance criteria.
This guide was written by welding engineering professionals with 15+ years of experience in German and international fabrication codes. For specific applications, always consult a certified welding engineer (IWE/EWE).