En Iso 13920-bf =link= File

Selecting targets a customary, high-quality workshop precision profile that does not require secondary machining. The "F" Precision Value (Form and Position)

Inspecting a welded structure built to EN ISO 13920-BF requires standard workshop metrology tools. Because it is a medium-tier classification, specialized laser trackers are rarely needed, keeping operational overhead low. ISO 13920-BF Welding Tolerances Guide | PDF - Scribd

: This refers to the tolerance class for linear and angular dimensions (length, width, height, and angles) . It is based on "customary workshop accuracy" and is the most common class used in general engineering .

: Designers do not have to write down tolerances for every joint. They simply place "EN ISO 13920-BF" in the title block. en iso 13920-bf

Rigidly clamping workpieces to a heavy welding table mechanically restricts components from warping during cooling.

The selection of a tolerance class has a direct impact on manufacturing cost, complexity, and risk. The "BF" combination is widely used because it represents a practical balance between precision and economic reality.

: Represented by uppercase letters (E, F, G, H). ISO 13920-BF Welding Tolerances Guide | PDF -

It is not intended for critical mating features, which require individually specified tolerances (e.g., ISO 286 for hole-shaft fits), nor for dimensions that are crucial to a part's core function.

: It provides a clear benchmark for what is considered an acceptable "standard" build in industrial fabrication.

The EN ISO 13920 standard divides tolerances into different classes, and the suffix "" relates to specific categories for linear and angular dimensions. They simply place "EN ISO 13920-BF" in the title block

At its core, EN ISO 13920 is the European standard that harmonizes with the international standard ISO 13920: "Welding — General tolerances for welded constructions — Dimensions for lengths and angles — Shape and position" .

The suffix tells the manufacturer exactly which tolerance "bracket" to use for different types of measurements: