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 While it is a moderately accurate class, it has largely been superseded by the international standard ISO 13920.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If you are searching for a DIN 8570 B PDF, it is critical to note that this German national standard was officially withdrawn and replaced by ISO 13920:1996.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 DIN 8570 (Superseded) ISO 13920 (Current) Scope General tolerances for welded structures International standard for welding tolerances Linear Classes A, B, C, D A, B, C, D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?
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
Here are a few options for your post, ranging from a quick LinkedIn tip to a more detailed blog-style update. Option 1: Quick Professional Post (LinkedIn/X)
👋 Are you still using DIN 8570 for your welding tolerances? If you’ve ever come across DIN 8570 B
on a drawing, you’re looking at the standard for general tolerances in welded structures. Specifically,
represents a medium level of accuracy based on "customary workshop accuracy". Key takeaways: What it covers:
Linear and angular dimensions where no specific tolerance is given. The "B" Class:
One of four classes (A, B, C, D), where A is the finest and D is the coarsest. Current Status: Be careful! This standard was technically superseded by DIN EN ISO 13920 back in 1996.
If you’re working on legacy drawings or need the full specs, you can often find the DIN 8570 B PDF on archival sites like Intertek Inform
#WeldingStandards #Engineering #DIN8570 #ManufacturingTips #Tolerances Option 2: Detailed Technical Summary (Blog or Newsletter)
Understanding DIN 8570 Class B: The "Goldilocks" of Welding Tolerances
When designing welded structures, we don't always want to specify every single tolerance. That’s where
comes in—a German standard designed to simplify drawings by providing default values. Why Class B?
Class B is frequently chosen because it balances functional requirements with manufacturing costs. Smallest tolerances (High precision/cost). Medium tolerances (Standard workshop precision). Class C & D: Larger tolerances (Lower precision/cost). Din 8570-1987 | PDF | Engineering Tolerance - Scribd
" * Scope. This standard is intended to simplify drawings. It specifies generai tolerances for linear. and angular dimensions of \ Norma Din-8570-1 | PDF - Scribd
DIN 8570 Part 1 is the historical German standard for general tolerances in welded structures, specifically covering linear and angular dimensions. If you see a reference to "DIN 8570 B," it likely refers to Tolerance Class B (Medium) within this standard, which is the most common class for general engineering and construction.
⚠️ Important Note: DIN 8570 has been withdrawn and replaced by the international standard ISO 13920. For new designs or contracts, you should use the updated designation, such as ISO 13920-B. 📏 Tolerance Class B: Key Specifications
Class B represents "customary workshop accuracy" and is used when no specific individual tolerances are given on a drawing. Linear Dimension Tolerances (in mm) Nominal Range (mm) Tolerance ( ±plus or minus 120 to 400 400 to 1,000 1,000 to 2,000 2,000 to 4,000 4,000 to 8,000 8,000 to 12,000 12,000 to 16,000 Angular Dimension Tolerances din 8570 b pdf
Tolerances for angles depend on the length of the shorter leg ( ) of the angle. Up to 400 mm: ±plus or minus 45' (minutes) 400 to 1,000 mm: ±plus or minus 30' (minutes) Over 1,000 mm: ±plus or minus 20' (minutes) 🛠️ Why Use This Standard?
Simplifies Drawings: You don't need to label every single dimension with a specific tolerance.
Cost Efficiency: Using Class B avoids the high costs of unnecessary "Fine" (Class A) precision.
Quality Baseline: Provides a clear legal and technical reference for fabricators and inspectors to minimize disputes.
Universal Recognition: Because it is identical to ISO 13920, it is accepted by international suppliers and clients.
đź’ˇ Standard Designation: To correctly specify this on a drawing, use the format ISO 13920-B or ISO 13920-BE (if including shape and position tolerances). To help you apply these tolerances correctly:
Do you need the shape and position (straightness/flatness) tables too? Are you working with steel or aluminum structures?
ISO 13920 Welding General tolerances for welded constructions
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The DIN 8570 standard provides general tolerances for welded structures, specifically covering linear and angular dimensions, as well as shape and position. It is designed to simplify technical drawings by establishing default accuracy classes based on "customary workshop accuracy". 0;16;
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It is critical to note that DIN 8570 has been superseded. For modern engineering projects, the current international standard is DIN EN ISO 13920. While many legacy documents still refer to DIN 8570, current certifications typically require adherence to ISO 13920. 0;16;
18;write_to_target_document7;default0;c25;18;write_to_target_document1a;_TwvuaaGfMc-O4-EPja-ciAo_20;a5; Tolerance Class B Explained 0;16;
DIN 8570 (and its successor ISO 13920) divides accuracy into four classes: A, B, C, and D. 0;16;
18;write_to_target_document7;default0;348;18;write_to_target_document1a;_TwvuaaGfMc-O4-EPja-ciAo_20;381;0;443; Class A: Fine (highest precision) Class B: Medium/Mean0;b67; (standard workshop accuracy) Class C: Coarse Class D: Very Coarse 0;2a;
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Class B is frequently the default choice for general mechanical engineering because it balances functional requirements with economical production costs. 0;16;
18;write_to_target_document7;default0;6a4;18;write_to_target_document1a;_TwvuaaGfMc-O4-EPja-ciAo_20;a5; Scope of the Standard 0;16;
The standard is divided into parts that cover different geometric aspects:Â 0;16;
Part 1 (Linear and Angular Dimensions): Limits for deviations in length and angle.
Part 3 (Form and Position):0;402; Limits for straightness, flatness, and parallelism.
Tolerances for Linear Dimensions (Class B): Tolerances increase as the nominal size increases. For example: Over 30 to 120 mm: ±1 mm0;9f5; Over 400 to 1000 mm: ±2 mm
Over 2000 to 4000 mm: ±4 mm 18;write_to_target_document7;default0;348;18;write_to_target_document1a;_TwvuaaGfMc-O4-EPja-ciAo_20;54; How to Access the PDF 0;16;
Official copies of the current equivalent standard can be purchased through authorized distributors:Â 0;16; DIN Media (Beuth): The official source for DIN standards. DIN 8570-B refers to a specific tolerance class
ISO Store0;145;0;451;: Provides the international version, ISO 13920.
Intertek Inform0;402;0;892;: 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;
To apply these tolerances, the following notation should be added to the drawing's title block or notes:Â 0;16; 0;1c1;0;7ea;
General tolerances DIN 8570 – B (or ISO 13920 – B) 0;33;
If specific dimensions require higher precision than Class B, those must be indicated individually on the drawing. 18;write_to_target_document7;default0;348;18;write_to_target_document1a;_TwvuaaGfMc-O4-EPja-ciAo_20;16;
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18;write_to_target_document7;default18;write_to_target_document1a;_TwvuaaGfMc-O4-EPja-ciAo_20;4c85;0;4c0a;
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Title: The Welder’s Guide to DIN 8570 B: Free PDF, Weld Imperfections, and Quality Levels
Meta Description: Searching for the DIN 8570 B PDF? Learn what this critical German welding standard covers, the difference between Form B and Form C, and how to download the official document.
The suffix 'B' in DIN 8570 B typically refers to a specific tolerance class or grade of precision.
Standards like DIN 8570 usually categorize tolerances into classes (often labeled A, B, C, etc., or through specific numerical grades) to account for different manufacturing capabilities:
By referencing DIN 8570 B, a manufacturer knows that any dimension on the drawing without a specific label must adhere to the "Medium" tolerance range defined in that standard.
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.
Many engineering drawings and welding procedure specifications (WPS) explicitly cite DIN 8570-B. If you are fabricating for German or European markets, your customer may require compliance with this standard.
By respecting the standard’s copyright and using the correct document for your application, you ensure safety, quality, and legal compliance in every welded joint.
This article is for informational purposes only. Always consult the official standard document for legal and contractual use.
DIN 8570 Class B sets standard workshop tolerances for welded structures, but it has been officially superseded by DIN EN ISO 13920. The standard defines permissible deviations for linear, angular, and shape dimensions across four tolerance classes, with Class B serving as the typical industrial standard. For access to the current standards, reference documents are available on Scribd and official purchase options at the ISO Store.
DIN EN ISO 13920-1996 - General Tolerances for Welding - Scribd
DIN 8570 was a historical German standard for general tolerances in welded structures, which has since been superseded by the international standard ISO 13920. It established standardized accuracy levels for linear and angular dimensions, as well as shape and position, to simplify technical drawings. The Role of Tolerance Class B
In DIN 8570, "B" refers to one of four specific tolerance classes for linear and angular dimensions.
Precision Levels: Class A (fine), Class B (medium), Class C (coarse), and Class D (very coarse).
Application: Class B is typically used for standard workshop accuracy where functional requirements do not demand high precision but still require controlled assembly quality.
Measurement Ranges: For class B, the permissible deviation increases with the size of the component (e.g., ±2 mm for 120–400 mm, and up to ±16 mm for lengths up to 20,000 mm). Key Components of the Standard
The standard was originally divided into parts to cover different aspects of weldment geometry: Title: The Welder’s Guide to DIN 8570 B:
Part 1 (DIN 8570-1): Focused on linear and angular dimensions, such as external sizes, center line distances, and right angles.
Part 3 (DIN 8570-3): Covered geometrical tolerances, including straightness, flatness, and parallelism.
Simplified Notations: Drawings would often use combined codes like "DIN 8570-BF" to indicate Class B for dimensions and Class F for geometry. Modern Equivalent: ISO 13920
Since 1996, DIN 8570 has been withdrawn and replaced by ISO 13920. Most engineering firms now use this international standard to ensure global compatibility. You can find detailed comparison tables and official PDF documentation through technical portals like Intertek Inform or Scribd. General Tolerances for Welded Structures | PDF - Scribd
Please note: The designation "DIN 8570" does not correspond to a current, widely indexed standard in the DIN registry. The essay above assumes you intended DIN 8573 (*PrĂĽfung von
DIN 8570-B refers to a specific tolerance class within the DIN 8570 standard for general tolerances of welded structures It is important to note that DIN 8570 has been largely superseded by ISO 13920
. If you are looking for current technical specifications for new projects, you should refer to ISO 13920 Class B (linear/angular dimensions) or (straightness, flatness, and parallelism). Key Details of DIN 8570 Class B
The standard is designed to simplify engineering drawings by providing default tolerance values based on "customary workshop accuracy". Classification
: Class B is typically the second finest class (after Class A), representing a medium-high level of precision for welded components.
: It covers linear dimensions (lengths, widths, heights) and angular dimensions. : Focuses on linear and angular dimensions. : Focuses on form and position (geometrical) tolerances.
: The choice of "Class B" should be based on the functional requirements of the welded part—if it needs to fit precisely into another assembly, Class B or A is often specified. Where to Access PDF Guides
Because these are copyrighted technical standards, full PDF documents are typically available through paid services or professional document hosting sites: Din 8570-1987 | PDF | Engineering Tolerance - Scribd
Since DIN 8570 is withdrawn, you can get the equivalent limits from:
While DIN 8570 B is a standard that defines general tolerances for medium-precision mechanical parts, modern engineering practices have largely shifted toward its international successor, ISO 2768. For those seeking the document, purchasing the official ISO 2768-1 standard is the best way to ensure you are working with current, legally compliant technical data.
Disclaimer: This article is for informational purposes only. Always consult official standard documentation for engineering and manufacturing decisions.
DIN 8570 is a withdrawn German standard for general tolerances in welded structures that has been superseded by DIN EN ISO 13920.
The designation "B" typically refers to Class B, which represents "medium" or "customary workshop accuracy" for linear and angular dimensions. 🛠️ Overview of DIN 8570 Class B
This standard simplifies technical drawings by providing default permissible deviations when specific tolerances aren't listed for a weldment.
Four Accuracy Classes: A (Fine), B (Medium), C (Coarse), and D (Very Coarse).
Application: Used for linear dimensions (external, internal, offsets, center distances) and angular dimensions (including right angles).
Criteria: Selection is based on the functional requirements of the welded assembly. đź“Ź General Tolerances for Class B
While the full official text is copyrighted and sold by organizations like DIN Media, the typical values for Class B (medium) are as follows: Linear Dimensions (mm) Nominal Range (mm) Tolerance (± mm) Over 30 to 120 Over 120 to 400 Over 400 to 1000 Over 1000 to 2000 Angular Dimensions Length of Short Leg (mm) Tolerance (± degrees/minutes) Over 400 to 1000
đź“Ť Key Point: If your project requires higher precision than these "B" values, you must specify individual tolerances on the drawing according to DIN 406 Part 2. đź“„ Accessing the Full PDF
Because this is a protected industrial standard, you can find full versions or official replacements through these platforms:
Official Purchase: Buy the current replacement standard (ISO 13920) at Beuth Verlag.
Historical Reference: View archived copies on Scribd (requires subscription).
Free Summaries: Search for "ISO 13920 tolerance tables" as it contains the identical data used in modern engineering.
If you'd like, I can help you find the exact tolerance table for a specific part size or explain how to properly cite Class B on your technical drawings. Din 8570-1987 | PDF | Engineering Tolerance - Scribd