Casing Pipe: Technical standard: API SPEC 5CTAPI SPEC 5B Product grade H40J55K55N80-1N80QL80C90T95P110 Specification range OD114.3~339.7mm, WT5.21~22.22mm(4 1/2"~13 3/8") Thread types: Short round thread(STC).Long round thread(LC).Buttress thread(BC) The range of length R2(7.62m~10.36m)R3(10.36m~14.63m) Application of product Pipe run from the surface and intended to line the wall of a drilled well. Casing Coupling: Technical standard API SPEC 5CTAPI SPEC 5B Product grade H40J55K55N80-1N80QL80C95T95P110 Specification range OD127~365.12mm4 1/2"~13 3/8" Thread types: Short round thread(STC)Long round thread(LC)Buttress thread(BC) Application of product Internally threaded cylinder for joining two lengths of threaded casing pipe Casing Pup-Joint: Technical standard API SPEC 5CTAPI SPEC 5B Product grade H40J55K55N80-1N80QL80C95T95P110 Specification range OD114.3~339.7mm, WT5.21~22.22mm(4 1/2"~13 3/8") Thread types: Short round thread(STC).Long round thread(LC).Buttress thread(BC) The range of length < R1 (4.88m) Application of product Casing of length shorter than R1, Used to regulate casing surface location, and connect cement head. Feel free to contact us if any further questions,we will serve you as soon as possible.