World iron & steel is one of the leading China API 5CT Oil Tubing manufacturers and suppliers. The API 5CT Oil Well Drilling Casing Pipes grade Q125 are mainly used for oil well boring and drilling, it provides structural integrity to the wellbore and withstands external-collapse pressure from rock formations and internal-yield pressure from oil and gas.
Standard: API5CT-American Petroleum Institute Specification for seamless casing and tubing
Size：1/4" to 24" Outside Diameter 13.7 mm to 610 mm；
Wall thickness：SCH10, SCH20, SCH30, SCH40, SCH60, STD, SCH80, SCH100 XS, SCH120, SCH160, XXS；
Length：R1 (6.10-7.32m), R2 (8.53-9.75m), R3 (11.58-12.80m)
Tolerance: OD＜114.3mm, tolerance ±0.79; OD≥114.3mm, tolerance -0.5% +1%