| Models | Features |
| 2-3/8"EU*2-7/8"EU | 1.External thread 2.Reducing coupling 3. Having Good Sealing Property |
| 2-7/8"NU*3-1/2"NU | |
| 3-1/2"NU*3-1/2"EU | |
| 2-3/8"NU*2-3/8"EU | |
| 2-7/8"NU*2-7/8"EU | |
| 2-3/8"EU*2-7/8"NU | |
| 1. Grade: J55, K55, N80-1, N80-Q, L80, C90, P110 | |
| 2. We also supply permium thread products by customer' s request | |
| 3. Size: tubing coupling from 1.9" to 4-1/2" , Casing coupling fro4-1/2" to 13-3/8" | |
| 4. Type: NU, EU(tubing coupling), STC, LC, BTC(casing coupling). | |
| 5. Surface treatment: Whole phosphating, or inside phosphating and outside coating | |
| 6. Packing: By carton, wooden case, wooden pallet, or by requirements of customers | |
