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.
EN ISO 13920-BF is frequently cited in technical drawings and specifications for: Structural steel frames. Bridge construction components. Machinery baseplates. Pressure vessel supports.
The standard covers the following aspects: en iso 13920-bf
The code "BF" consists of two distinct tolerance classes defined in ISO 13920 :
The suffix tells the manufacturer exactly which tolerance "bracket" to use for different types of measurements: Q: How do I determine the tolerance class
The EN ISO 13920 standard divides tolerances into different classes, and the suffix "" relates to specific categories for linear and angular dimensions.
If part A slides into part B with a clearance of 0.2 mm, . Class B allows ±3 mm over 400 mm. Your sliding fit will jam or wobble. Use Class A or machine after welding. EN ISO 13920-BF is frequently cited in technical
Example: A 2,500 mm long beam should not bow more than 3 mm over its entire length.
This is the most common tolerance class used in general engineering and construction. It covers linear dimensions (lengths, widths, heights) and angular dimensions.
The following sections break down the core engineering rules, tables, and inspection protocols required to comply with EN ISO 13920-BF. Structural Breakdown of the "BF" Designation