... quality . Premium Connection StandardAPI 5CT and technical agreementGradeJ55/K55, N80, L80, L80-9Cr, L80-13Cr, C90, T95, C95, P110, Q125,V150 etcThickness2.87 ... supply self-development(R&D) premium connection which samiliar with VAM thread such as HSM-1, HSM-2, TPCQ etc.. For ...