Keywords: API casing, API tubing, N80 casing, N80 tubing, oil casing, oil tubing, casing tubing Standard and Grades: API 5CT J55 / K55, N80-1, N80Q, C90, T95, P110, Q125 and 13Cr Casing Pipe Size range: 5 1/2” to 20” Length usually in R3. Tubing Pipe dimensions range: 1.0”, 1.315”, 1.66”, 1.9”, 2.063”, 2 3/8”, 3 1/2”and 4 1 /2”, Length in R2. Type of connections for Casing: BTC (thread coupling buttress), LTC (long round thread coupling), premium connection. Types of connections for Tubing: BTC, NUE, EUE, Premium