Spiral Welded Oil Drilling Pipes 1.OD: 10.3-1219.2mm 2.WT: 1.24-60mm 3. Material:A25,A,B,X42,X46, ... 2-3/8",2-7/8",3-1/2,4",4-1/2",5",5-1/2"oil drilling pipe :-Drilling pipe, ... and so on. Our API drill pipes are of high physical property, for their strictly controlled processing of sulphur and ... in accordance to Standards of API 5DP, API7 &7-1, NS-1. RUSSIA RTN, RUSSIA GOST-R, ISO 9001,ISO 14001 ...