Tubing Coupling is used to connect two joints of tubing pipe together. Tubing coupling is short length of heavy wall pipe with the same thread on each end.
| Specification of API Tubing Coupling | |||
| No. | Size | Thread | Grade |
| 1 | 2-3/8" | EUE NUE | J55 K55 N80 L80 P110 |
| 2-7/8" | |||
| 3-1/2" | |||
| 4" | |||
| 4-1/2" | |||








