En Iso 13920-bf

: 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 .

: The tolerance class for shape and position (straightness, flatness, and parallelism). Typical Applications en iso 13920-bf

EN ISO 13920-BF is a combined tolerance designation used in the fabrication of welded structures to specify acceptable deviations in dimensions and shape without detailing every single measurement on a technical drawing. Standard Breakdown EN ISO 13920 : This refers to the tolerance class for

ISO 13920-BF Tolerance class: CL-M (medium) Backing: Removable copper backing Process: 135 (MAG) en iso 13920-bf