The Board comprises: a tubular threaded Male threaded element (11) which ends in a Male Lip (18) which has a Seal surface of male (13) and a Transverse Surface (16) of Top Male (14) adjacent to the Sealing surface and a Male, Female threaded element (21) which includes, so That Cooperate with corresponding means of the male threaded element.A female Seal Surface (23) and a cross-sectional area (26) disposed at a Top Female highlight female and Female adjacent to the Sealing Surface.The annular area highlight female (24) which is subjected to axial Compression are efforts that support surfaces of Top Male and Female (16) (26) has an inner Peripheral Surface (27) (IDB) whose internal diameter is at least Locally in the vicinity of Dec Female has Top Surface (26),(IDP) less than the diameter of the Inner Peripheral surface of the male Lip (17) (18), the ratio R of these two diameters (IDB / IDP) less than 1 but greater than or equal to 0.9.
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