En Iso 13920-bf

Chassis and bases for agricultural, mining, and construction equipment.

The standard was originally published in 1996. A significant update was released in , which supersedes the 1996 version. If you are referencing older documentation, be aware that EN ISO 13920-BF as a code has remained in use, but any new designs should refer to the 2023 edition of the standard to ensure compliance with the latest requirements.

It is equally important to recognize what the general tolerances in EN ISO 13920 do not cover. These include:

This refers to how straight or flat the structure is. Class "F" is a common standard for general engineering, ensuring the final piece isn't so distorted that it won't fit into its designated space. Why it Matters By specifying EN ISO 13920-BF on a drawing, a company like NOVATECH ApS en iso 13920-bf

Linear tolerances scale with the overall size of the component. The longer the segment, the wider the allowable variance window to account for cumulative heat distortion. 1. Linear Dimensions (Lengths, Widths, Offsets)

Thus, – it likely means: Use ISO 13920 (unspecified class, usually Class D or E) + BF weld prep (ISO 9692-1). Chassis and bases for agricultural, mining, and construction

EN ISO 13920-BF is a specific technical standard for general tolerances in welded constructions, the best way to make it "interesting" is to highlight how it prevents costly manufacturing headaches. Here are two options depending on your platform: Option 1: The "Problem-Solver" (Best for LinkedIn)

For a welded assembly with linear dimension tolerances in class B, the permissible deviations (in millimeters) for a given nominal dimension range are as follows:

Table derived from data where class B angular tolerance is listed as 0.75°, 0.5°, 0.33° for ranges 0-400, >400-1000, >1000 respectively, converted to mm/m using the tangent of these angles. If you are referencing older documentation, be aware

It acts as a universal language for international contracts, ensuring a manufacturer in Europe and a client in the Middle East have the same expectations for accuracy.

A recurring question in engineering forums is whether a note like "ISO 13920-BF" is sufficient on its own. While the standard provides the tolerance values, some engineers argue for more explicit controls using datum references, especially for critical features. For complex structures, special provisions for individual dimensions may be necessary. The standard itself acknowledges that general tolerances are for dimensions without individual tolerance specifications. If a drawing includes linear and angular dimensions without individually indicated tolerances, it is considered incomplete if there is no reference to general tolerances. Therefore, including "EN ISO 13920-BF" in the title block is the correct method to complete the drawing and provide the manufacturer with the required tolerance information.