... Tube: a. O.D.: 1/2'' to 4'' b. W.T.:SCH40,80,160 c. Standards: DIN17175 Seamless round steel tube ... ; Cr≤0.25; Cu≤0.25; Ni≤0.25W.T TOLERANCE: ±12.5%O.D TOLERANCE: ASTM A53 GRBD<48.3 ±0 ... -13M, can as customers requirementSIZE: 1/8" to 24"W.T SCH 5, SCH 10, SCH 20, SCH 40, SCH 80 ...