FIELD: structures of smallsize adapters of different type materials made by diffusion welding along thread. SUBSTANCE: outer sleeve has on inner surface on thread zone annular vacuum- tight closure in the form of turning filled with inner sleeve metal diffusion welded with metal of outer sleeve. Presence in thread zone of annular vacuum-tight closure provides vacuum tightness of adapter in all operational modes. EFFECT: improved design of adaptor. 6 cl, 1 dwg, 1 ex
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