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API 5CT 13 3/8" Seamless L80 Tubing/Casing Pipe. Wide Size Range: Available in sizes from 4 1/2" to 20" with wall thickness 6.35-12.70mm. Multiple Grade Options: Offers J55, K55, L80, N80Q, C90, T95, and P110 grades. API 5CT Standard: Manufactured strictly in accordance with API 5CT standards. Diverse Thread Types: Supports STC, LTC, and BTC thread connections. Customization Services: OEM and ODM services available for tailored specifications. High Performance: Resistant to high pressure, extreme temperatures, and corrosion. Versatile Applications: Ideal for petroleum, chemical engineering, power, and boiler industries. Manufacturer Direct: Direct sales from manufacturer with 8 R&D engineers and 52,000 sqm plant.