Refers to the Intermediate tolerance class for straightness, flatness, and parallelism. It represents a standard, reliable quality level in fabrication.
EN ISO 13920 (Welding – General tolerances for welded constructions) Class: BF Status: Active (Harmonized across EU)
This guide explains the technical specifications for , an international standard used to define general tolerances for welded constructions. Overview of EN ISO 13920 en iso 13920-bf
This is the "Medium" class for lengths and angles. It defines the allowable deviation for measurements like the length of a beam or the degree of an angle.
In many industrial contexts, particularly in heavy machinery and automotive supply chains, engineers often confuse or conflate standards. The most common standard classes are: Refers to the Intermediate tolerance class for straightness,
: Dictates the allowable variation for length, width, height, and angle leg measurements. Class B represents the "Medium" or "B-level" accuracy class. It is the most widely specified standard for structural steelwork, general machine building, and medium-duty heavy equipment.
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: Controls Form and Position . It sets limits for structural straightness, flatness, and parallelism. Class F represents an intermediate workshop baseline that prevents twisting, bending, or bowing across wide plates and profiles. Core Dimensional Tolerances (Class B)