Rolling tolerances to BS EN 10210-2: 2006 for Hot-Finished Circular Hollow Sections

Designation Property Tolerance
  Outside diameter D ±1.0% with a min of ±0.5 mm and a max of ±10 mm
Thickness t Welded –10%
Seamless –10% but between 10% and 12.5% may occur over not more than 25% of the circumference
Note: Positive deviation is limited by mass tolerance
Measured at the centre of the length Straightness (x or y direction) 0.20% L
Mass per unit length Mass of section Welded ±6.0% on individual lengths
Seamless +8.0% –6% on individual lengths
Standard Length L +150 mm –0 mm