The EN ISO 13920 code utilizes a dual-letter classification system to dictate manufacturing limits. In the case of , the letters break down as follows:
Decoding the Blueprint: What does "EN ISO 13920-BF" actually mean? If you see ISO 13920-BF
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Q: How do I determine the tolerance class for my welded construction? A: The tolerance class depends on the specific application, industry, and required level of precision. Refer to the standard or consult with a qualified engineer or inspector.
The keyword refers to a specific, combined tolerance classification under the international standard for general manufacturing tolerances in welded structures. In engineering design and heavy fabrication, specifying "Class B" for linear and angular dimensions and "Class F" for geometrical shapes and positions provides a optimized baseline of "customary workshop accuracy". This baseline maintains component functionality without forcing factories into over-engineered, cost-prohibitive machining cycles. The EN ISO 13920 code utilizes a dual-letter
: Governs form and position attributes, specifically straightness, flatness, and parallelism . Class F is the second-tightest tier out of four classes (E, F, G, and H), ensuring parts align seamlessly during final mechanical assembly. Class B: Linear and Angular Tolerances
The most straightforward implementation is to add a note to the drawing's title block, such as . This clearly defines the baseline expectation for all dimensions not otherwise specified, removing ambiguity. This link or copies made by others cannot be deleted
between functional accuracy and manufacturing cost. It requires skilled welders and decent fixturing but does not mandate expensive post-weld heat treatment or machining.
Therefore, signifies that a welded structure is built according to intermediate quality standards for both dimensional accuracy and structural shape. Core Components of EN ISO 13920-BF
: The international standard for "General tolerances for welded constructions". : Refers to the tolerance class for linear and angular dimensions