Coupling is used to connect two tubing pipes. Following are the regular oil tubing coupling specifications.

Size: 1.315"-4-1/2"

Grade: J55, K55, N80-1/N80-Q, L80-1, L80-9Cr, L80-13Cr, P110

Standard: API Spec 5CT, API Spec 5B, GOST

Thread: NUE, EUE, Premium Connections

(NU-Non-Upset,  EU-External Upset)