API 5ct Oil Tubing and Casing Coupling

We are offring oil tubing, casing coupling features grade: j55, k55, n80-1, n80-q, l80, c90, p110 we also supply premium thread products by customer’s request size: tubing coupling from 1.9” to 4-1/2”, casing coupling from 4-1/2” to 13-3/8” type: nue, eue (tubing coupling), stc, lc, btc (casing coupling). surface treatment: whole phosphating, or inside phosphating and outside coating packing: by carton, wooden case, wooden pallet, or by requirements of customers.