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