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We offer a complete range of American Petroleum Institute (API) certified casing thread types, including short and round thread casing (STC), long round thread casing (LTC) and buttress thread casing (BTC).
STC and LTC both feature a non-runout design of round threads, each with eight round crested threads per inch. BTC has a square thread with a flat root and crest, a runout design, and five buttress threads per inch.
Each thread type is suited for a specific well condition.
STC – Suited for shorter length casing applications that do not involve high axial loads or bending.
LTC – Well suited for situations where some axial load is encountered but overall, well conditions do not include extremes of temperatures or pressure.
BTC – Excellent connection for use in well situations involving higher axial loads and moderate internal pressures and temperatures.
U. S. Steel Tubular’s other API connections include non-upset end tubing (NUE) and external-upset end tubing (EUE). Both offer eight or ten round threads per inch and a non-runout design of round threads. NUE is well suited to light duty, general purpose applications.
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