Patent ID: 7255374

Claim:
A threaded tube joint, comprising a male threaded tube member ( 1 ) and a female threaded tube member ( 2 ) with substantially cylindrical walls, the male member ( 1 ) having a toroidal sealing surface ( 11 ) placed at its end portion near the threaded portion thereof engaging for sealing purpose, when the male and female members ( 1 , 2 ) are in the assembled position, a corresponding frusto-conical sealing surface ( 12 ) of the female threaded tube member ( 2 ) placed near a threaded portion characterised by the fact that the toroidal sealing surface has a radius Rs value comprised in the range between 30 and 75 mm for a tube having an outer diameter (OD) of less than 140 mm and between 30 and 100 mm for a tube having an outer diameter (OD) of more than 140 mm, —wherein the male member ( 1 ) has a front end first frusto-conical abutment surface ( 9 ) forming a first angle (γ) comprised in a range between −15° and −5° with a plane orthogonal to a longitudinal axis (X) defined by the joint, and wherein the female member ( 2 ) has a complementary second frusto-conical abutment surface ( 10 ) forming a second angle (γ) of same value as the first angle.