STC Thread protector steel type for 8 5/8" CSG
① Short round threaded casing (STC) indicates short round threaded casing (CSG)
② Long round threaded sleeve (LC) indicates long round threaded sleeve (LCSG)
③ BTC refers to offset ladder thread (BCSG)
④ Direct Connected Casing (XC) (XCSG)
⑤ NUE tubing (non thickening) N means non thickening, marked asTBG.
⑥ EUE means thickened oil pipe (externally thickened),marked as UP TBG
