... HSM, TPCQ, TPFJ, TPEX, 3.Excellent quality . Premium Connection StandardAPI 5CT and technical agreementGradeJ55/K55, N80, L80, L80-9Cr ... –50 mmOuter Diameter1.050 inch –20 inchPlace of OriginChinaApplicationGas tight connection, High torque ConnectionConnection typeBGT, HSM, TPCQ, TPFJ, TPEX, ... mills that could supply self-development(R&D) premium connection which samiliar with VAM thread such as HSM-1 ...