![]() China StandardsĬhina has more quantity standards compared to European standards, but less than american standards, Wall thickness tolerance should be +/-10%t or better, and average thickness tolerance should be ( +/-20 – 22%t, 0 ), pipeline pipe has a larger tolerance, hot finished seamless pipe largest. ASTM A999īut A511 for seamless stainless steel mechanical tubing and A554 welded stainless steel mechanical tubing not conform to above standards, they have separate outside diameter and thickness tolerances.Īmerican standard outside diameter tolerance mainly used to represent the absolute value, over and below tolerances are often asymmetric, SS tube and pipe in American standard average tolerance can reach even higher than D4 class in EN ISO 1127 standard. America StandardĪmerica standard has two standard rules to specify outside diameter and thickness, ASTM A999 / A999M and A1016 / A1016M. The tolerances on outside diameter and thickness from above table, greater value shall be selected.ĮN 10312 has specific values in table series 1 and series 2. From D1 to D4 class for outer diameter, and T1 to T4 for wall thickness tolerance comply to DIN EN ISO 1127 standard, stainless steel tubes – Dimensions, tolerances and conventional masses per unit length. ![]()
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