En Iso 13920-bf !!better!! 【TRUSTED ●】

By defining a "medium" standard, it balances the high cost of extreme precision with the need for stability. Application in Industry

To understand what the "BF" designation means in tangible terms, it is necessary to refer to the tolerance tables within the standard. The following tables outline the specific limit deviations that correspond to tolerance classes B and F for various feature sizes.

EN ISO 13920-1:2014, also known as "Hot finished structural hollow sections - Part 1: General requirements", is a European Standard that defines the requirements for hot-finished structural hollow sections (HSS) made of steel. I'll break down the article into sections to make it easier to understand.

The standard breaks down its designations into two distinct letters:

between functional accuracy and manufacturing cost. It requires skilled welders and decent fixturing but does not mandate expensive post-weld heat treatment or machining.

For a welded construction, the permissible deviation for shape and position (e.g., the flatness of a large plate or the parallelism between two surfaces) is determined using the tolerance values shown below. The value "l" in the table is the nominal length of the feature being measured.