United Casing Inc.(UCI), is a company that provides sales, marketing,and fabrication of steel tubular products. UCI has a world-wide customer base which includes the United States, Europe, the former USSR, and the People's Republic of China. The company maintains associated offices in Houston, Texas, USA; Germany; Switzerland; Moscow; Beijing; Sao Paulo; and Ho Chi Min City.

The steel tubular group products have a strong focus on oil country tubular goods ("OCTG"). This product group includes casing, coupling, tubing, drillpipe and line pipe. UCI has manufacturing facilities in Houston and Corpus Christi, Texas; and Dusseldorf, Germany. UCI is an approved API-qualified threading supplier. The plants can process tubing from 0.75 inch OD (19 mm) through 13 3/8 inch OD (339.7 mm). The facilities feature a full-length heat treatment line which can normalize grades J-55, C-75 and N-80.

Threading capacity is as follows:

Macaroni tubing 19 to 48.3 mm
Standard tubing 60.0 to 88.9 mm
Casing 114.3 to 339.7 mm

UCI has been selling to all the major oil companies for many years.