Oil Casing & Tubing Supplier — API 5CT J55, K55, N80, L80, P110

API 5CT seamless oil casing & tubing: J55, K55, N80, L80, P110; OD 60–508 mm; BTC threads; black painting. Oil casing supplier from Tianjin, China. ISO 9001 + API.

• Standards & grades: Casing and tubing are supplied to API 5CT (Specification for Casing and Tubing), with connections gauged to API 5B thread standards (Typical). Where project documents require ASTM or GB equivalents, equivalent grades (A53, A106, 20#, Q345B) are available on select lines. Products are listed with API and ISO 9001 certification attributes and are manufactured under the ISO 9001 quality system (No. 31325Q300277R0S). Hydrostatic testing is performed per API 5CT requirements (Typical), and every heat is traceable through the Mill Test Certificate.
• Sino East is an oil casing supplier and OCTG manufacturer serving drilling contractors and well operators worldwide. Our API 5CT seamless casing and tubing range covers outer diameters from 60 to 508 mm (select lines from 21.3 to 1220 mm) in grades J55, K55, N80 and L80, with the full API J55–P110 range — and V150 on specific product lines — available for deeper, higher-pressure wells. Popular sizes include 7-inch and 10-3/4 inch casing supplied with Buttress Thread Coupling (BTC) connections. Pipes are produced as hot-rolled seamless with black painting or hot-rolled surfaces, tolerances of ±1% / ±5%, and are used for oil & gas drilling, casing and sewage transport. Order terms are flexible: MOQ from 25 to 100 tons, delivery 15–45 days, invoiced by actual or theoretical weight, with standard sea-freight packaging. Products carry API and ISO 9001 attributes, and every lot ships with a Mill Test Certificate.