Import 5inch Casing Coupling Btc — Buy in wholesale FOB from Supplier in China

The 5-inch BTC casing coupling is a threaded connector engineered to join 5-inch diameter API casing strings in oil and gas well completions. Manufactured from carbon steel or alloy steel in API grades J55, K55, N80, L80 and P110, this buttress thread coupling (BTC) conforms to API 5B dimensional and thread-form standards. The buttress thread profile, with its 3.000 threads per inch and truncated crest design, delivers superior tensile and compressive load capacity compared to round thread alternatives. This coupling is forged or machined from seamless steel tube stock, then heat-treated to achieve mechanical properties matching the casing grade it pairs with.

API 5B specifies thread tolerances, standoff control and coupling outside diameter dimensions that ensure pressure-tight sealing when torqued to defined make-up values. The 5-inch designation refers to the nominal casing outside diameter; actual coupling dimensions depend on the standard or special drift requirement. Surface finish typically includes phosphating or zinc plating for thread lubricant retention and galling resistance during make-up. For sour service environments, material hardness is controlled below 22 HRC to comply with NACE MR0175/ISO 15156 limits for sulfide stress cracking resistance.

This OCTG component serves drilling contractors, national oil companies and completion service providers operating in onshore and offshore basins. Buyers typically procure couplings matched to their casing specification, requiring full traceability to heat number, mill test certificates and API monogram licence verification. Importing from Tianjin Grand Victory Petroleum Equipment Co., Ltd involves confirming thread inspection reports, material certification and whether the supplier holds current API Q1 quality management system registration.

Tianjin Grand Victory Petroleum Equipment Co., Ltd operates from Jinghai, Guanghai Road in Tianjin, China, with the supplier address recorded as Jinghai No.17 Guanghai Road, Tianjin 301600. The company holds a harbor trust tier classification, though its response rate registers at 0.00 percent with zero average response hours logged on the platform. This profile indicates a supplier with established listing presence but unverified communication responsiveness that buyers must evaluate directly before reliance.

The supplier's product focus centres on petroleum equipment, specifically OCTG components including this API-standard casing coupling. No verified API monogram licence number, quality system certification or manufacturing capacity figures are present in the source data. Buyers should request current API Q1 registration status, ISO 9001 certification and specific mill test certificate samples to validate quality claims. The location in Tianjin, a major Chinese port city, offers logistical advantages for sea freight export, though buyers must independently confirm production lead times, minimum order quantities and whether stock is held locally or produced to order.