standard ASTM,JIS,DIN OD 1/4inch - 24inch wall thickness SCH20,SCH40,SCH60,SCH80,SCH100,SCH120,SCH160, ... .79mm ,D48.3-114.3mm,+-0.79%,D>114.3mm ±1.59/-0.79mmWT TolleranceWT +-12.5%ChemicalC:<0.30%,Si ... :> 0.10%,MN:0.29-1.06%,P:<0.035%,S:<0.035%,Cu:<0.40 ...