Standard: API 5CT
API Tubing Coupling
a. Diameters â 2 3/8â to 4 1/2â.
b. Weights - As per API 5CT.
c. Grades - J-55, K-55, N-80, L-80, P-110.
d. Connections - EUE, NUE, Special Clearance
API Casing Coupling
a. Diameters - 4 1/2â to 20â.
b. Weights - As Per API 5CT.
c. Grades - J-55, K55, N-80, L-80, P-110.
d. Connections - STC, LTC, BTC.