product:steel pipe Standard:GB/T8163 Chinese national standard Application:General seamless steel tubes for conveying fluids productionSteel pipetypeSeamless and ERWsize1/2" to 24"Wall thicknessSCH5S to SCH160, XS, XXSThickness ToleranceInternational standards : +-12.5% ,If the customer must shrink tolerance, we can do according to customer's requirements.standardsANSI ,ASTM, API ,DIN ,JIS ,BS , ...