... ,N80,P110 etc. 4.Thread:LTC,STC,BTC ยท API 5CT N80 oil casing pipe 1. Size:OD:6 ... ,J55,K55,L80,P110,C75,C95 etc.3. Standard:API 5CT & 5B4. thread type:STC,BTC,LTC5. brand ... for more than 10years and we have our own factory.We maily export alloy pipe,carbon pipe,oil ... Hengyang Steel,Baotou Steel , Anshan Steel etc. standard: API SPEC 5CTTubing and CasingApplicationTubing is used to extracting petroleum and ...