En Iso 13920-bf ⇒

For a length of 1 meter, the allowed deviation is approximately ±2plus or minus 2 Covers straightness, flatness, and parallelism.

Source: DIN EN ISO 13920 Standard.

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Note: Total flatness or straightness deviations are evaluated across the entire designated surface or section segment indicated on the technical drawing. Workshop Best Practices for Meeting BF Tolerances en iso 13920-bf

When a technical drawing specifies , it acts as a "safety net" for the manufacturer. Any dimension on the drawing that does not have a specific tolerance assigned to it automatically falls under the rules of Class B (for length/angle) and Class F (for shape). This is critical in industries such as:

This system of classes is designed to streamline the documentation process. Instead of individually specifying a tolerance for every dimension on a drawing, the engineer or designer can simply reference the appropriate EN ISO 13920 class in the drawing's title block.

The main criterion for selecting a particular tolerance class is based on the functional requirements that must be met for the structure to perform as intended. For a length of 1 meter, the allowed

This review is designed for engineering, quality assurance, and drafting departments to determine if this standard is suitable for a given project.

Parts made in different shops actually fit together on-site.

This standard is a cornerstone of modern fabrication, bridging the gap between the theoretical perfection of a digital model and the practical reality of a workshop. Whether you are building a bridge, a vehicle, or a machine frame, understanding and correctly applying it is fundamental to your success. I need to provide comprehensive information

Designing foundations for pumps or blowers. Transport: Fabricating chassis or frames for vehicles.

In the demanding world of metal fabrication, structural integrity and dimensional precision are non-negotiable. Whether building a skyscraper, a bridge, or heavy machinery, the structural components must fit together perfectly, ensuring safety, durability, and performance. is a critical international standard that provides the tolerances necessary for welded structures, specifically focusing on linear dimensions and angular tolerances for welded assemblies.