Ball joint with high tensile strength

A ball joint with high tensile strength comprising a base cap, a bearing socket disposed in said base cap, and a ball stud pivotally disposed on said bearing socket and partially disposed outside of said base cap, wherein said ball stud includes a ball portion pivotally disposed on said bearing socket and a shaft portion extended outwards from said ball portion and disposed outside of said base cap;

• wherein said base cap includes an outer cap unit, an inner cap unit engaged with said outer cap unit and defining a receiving space in an interior, and a bottom cap unit situated at a bottom of said outer cap unit and adapted to seal said inner cap unit, with said inner cap unit being situated in said outer cap unit, and said bottom cap unit being in contact with said inner cap unit, said receiving space being enclosed by said interior of said inner cap unit to accommodate said bearing socket, wherein said outer cap unit and said inner cap unit being made of dissimilar materials, a tensile strength of said inner cap unit being greater than a tensile strength of said outer cap unit, an interior of said outer cap unit including an inner cap wall, an accommodation room being enclosed by said inner cap wall to accommodate said inner cap unit, said inner cap unit including an outer cap wall in contact with said inner cap wall of said outer cap unit, said receiving space being adapted to accommodate said bearing socket and being covered by said bottom cap unit, said bottom cap unit being pressed by a bending portion caused by bending said outer cap unit so that said bearing socket is placed in position, wherein after said inner cap unit is positioned in said accommodation room of said outer cap unit, said bending portion presses said bottom cap unit to confine said bearing socket in said receiving space stably.