Oil country tubular goods (OCTG) is a family of seamless rolled products consisting of drill pipe, casing and tubing subjected to loading conditions according to their specific application. CONNECTIONS STC (short round thread casing) LTC (long round thread casing) BTC (buttress thread casing) XL (extreme-line casing) NUE (non-upset tubing) EUE (external upset tubing) IJ (integral