Mechanical connector for the connection and assembly of guns used in the perforation of petroleum producing wells. Each gun has a hollow cylindrically shaped housing whose ends have threaded joints. Explosive shipped-charges are radially set in respective peripheral slots of the gun. Guns are coaxially joined in vertical position within the casing of the well, forming an assembly that includes the firing head and a bottom sub. The joints between consecutive guns and between the bottom sub and the lowermost gun, include tubular adaptor pieces and intermediaries that have respectively a threaded joint end and an opposing end constituted by a bayonet-type locking joint formed by a single reinforced latching bayonet locking tab.