OTTM Tubing Pup Joint Coupling OTTG Casing GOST Standard The OTTM or OTTG belongs to GOST Standard of the OCTG tubing casing pup joints and coupling. The coupling marking usually includes the connection form (excluding short round threaded couplings), conditional diameter, steel grade, and coupling Type (special connection for OTTM and OTTG casing) and execution standard number OTTM-245X10- Д TOCT 632-80OTTM offset Buttress threaded casing; OTTM-245- Д TOCT 632-80 OTTM offset Buttress threaded coupling; OTTM-245- Д - CTOCT632-80OTTM special offset Buttress (reduced outer diameter) threaded coupling; OTT Г -245X10- Д TOCT632-80 OTT premium connection casing or tubing; OTT Г -245- ДГ OCT 632-80 OTT Г standard coupling; OTT Г -245- Д - C Г OCT 632-80 OTT Г special BTC (reduced outer diameter) threaded coupling.
