Supply ConditionCold Drawn Seamless Steel Tube, Stress Relived and Honed or Skived Roller Burnished Surface Roughness I. D.Ra+0.20.4 Micron Tolerance On Inner DiaH8 Tolerances On Wall Thickness < Dia 120 +-5% of wall thickness> Dia 120 +-5% of wall thickness StraightnessDia 40 > 100 +-0.3mm> Dia 100 +-0.5mm