Tubing
| Standard | API Spec 5CT |
| Grade / Material | J55, K55, N80, L80, C90, T95, P110 |
| Size | 4-1/2" ~20" |
| Length | R1, R2, R3 |
| Connections | P (Plain end) STC (short threads) LTC (long threads) BTC (buttress threads) Premium gas-tight connectors Others special connectors |