Connector system for use in ultra-high vacuum systems

(57) A metal fitting component (60) with the 2nd hardness higher than the 1st hardness of a metal lead pipe section (30) with the 1st hardness of a summary, and this lead pipe section, The connector which is arranged between a lead pipe section and a fitting component, and has metal reaction prevention Balia (80) which attaches these both to one in a seal mode and which is used for an ultrahigh-vacuum system. The metal lead pipe section (30) has a channel (F) between the 1st end (31), and the 2nd end (33) and these both ends. It does and the metal fitting component (60) has the channel (F) of a lead pipe section and the adjusted opening of the rear surface (61) close to the 2nd end of the lead pipe section, the front (63) which turned to the direction which separates from this rear surface, and the front and a back end. Reaction prevention Balia (80) has again the hole adjusted to the channel of a lead pipe section, and the opening of the fitting component. A reaction prevention component is chosen from the group of the metal between a lead pipe section and a fitting component which is metallic and prevents a chemical interaction substantially. Therefore, it prevents that the joint of a metal lead pipe section and a metal fitting component deteriorates, and reaction prevention Balia produces disclosure under an ultrahigh vacuum and repetitive temperature change conditions.