ISO-dimensions and tolerances for seamless tubes

Hot Extruded Tubes
Tolerances
Outside diameter        
EN ISO tolerance class D2
Permissible deviation ± 1.0 % (min. ± 0.5 mm)
Wall thickness <= 5 mm > 5 mm
EN ISO tolerance class T1 T2
Permissible deviation ± 15.0 % (min. ± 0.6 mm) ± 12.5 % (min. ± 0.4 mm)
Legend    
Vertical:   Outside diameter (mm)*
Horizontal:   Wall thickness (mm)*
    *Other diameters and/or wall thicknesses on request