Class A (fine), Class B (medium), Class C (coarse), and Class D (very coarse).
Engineers and quality control inspectors require the PDF document for several reasons:
A standard DIN 8570 B PDF contains tables divided by nominal dimensions. The longer the welded component, the larger the allowed deviation. The standard separates these tolerances into three distinct categories: Linear Dimensions din 8570 b pdf
Do you need to find a or a specific cross-reference table ?
In welded structures, localized heating and subsequent cooling create thermal shrinkage and distortion. Under Class B, the allowed deviation scales up based on the length of the nominal size. Nominal Range ( Permissible Deviation (Class B) ±1plus or minus 1 31 to 120 ±1plus or minus 1 121 to 400 ±2plus or minus 2 401 to 1000 ±3plus or minus 3 1001 to 2000 ±4plus or minus 4 2001 to 4000 ±6plus or minus 6 4001 to 8000 ±8plus or minus 8 8001 to 12000 ±10plus or minus 10 12001 to 16000 ±12plus or minus 12 16001 to 20000 ±14plus or minus 14 Over 20000 ±16plus or minus 16 📐 Angular Dimensions Tolerances (Class B) Class A (fine), Class B (medium), Class C
Send the customer a written deviation request (RFI):
: The standard defines four classes— A, B, C, and D . Class A is the finest (smallest tolerances). The standard separates these tolerances into three distinct
Understanding DIN 8570 Class B: General Tolerances for Welded Structures
Understanding DIN 8570 Beilage B – Welding Impermissible Defects (PDF Reference)
If you need it for work or study, your company’s quality or engineering department might have a licensed copy. Would you like a summary of the welding position notations instead?