A universal joint is provided, including: a seat, including a receiving room extending in an axial direction and at least one through hole in communication with the receiving room; a connecting member, including a ball head rotatably received within the receiving room; and an assembling mechanism, including at least one blocking member and a sleeve member sleeved around the seat, the at least one blocking member being received within the at least one through hole and blockable with the ball head in the axial direction, the sleeve member covering the at least one through hole; wherein the seat has a first hardness, the sleeve member has a second hardness smaller than the first hardness, an outer circumferential wall of the seat is partially embedded within an inner circumferential wall of the sleeve member.

A device including a ball, cage housing the ball and a centering lug, wherein the centering lug has a generally annular form with a radially outer annular periphery and a radially inner annular periphery, the outer annular periphery is integral with the cage and the inner annular periphery is inserted in a groove in the outer periphery of the ball, and the centering lug is elastic and arranged to hold the ball along a predefined axis in a rest position.

A pivoting joint assembly includes a base, a plate, and at least one bolt. The base has one or more semi-spherical sockets with each socket having a centrally-positioned hole extending through the base. The plate has one or more semi-spherical sockets recessed within the plate with aligned semi-spherical protrusions extending from the plate. The plate has a hole extending through a central portion of each of the plate's sockets and a corresponding protrusion aligned therewith. Each protrusion is partially fitted in a corresponding socket in the base. Each bolt has a head and a post extending from the head. The head includes a semi-spherical portion adjacent to the post. The post extends through aligned holes in the plate and base. The post is coupled to the base such that the semi-spherical portion of bolt's head nests within one of the plate's sockets.

A universal joint is provided, including: a seat, including a receiving room extending in an axial direction and at least one through hole in communication with the receiving room; a connecting member, including a ball head rotatably received within the receiving room; and an assembling mechanism, including at least one blocking member and a sleeve member sleeved around the seat, the at least one blocking member being received within the at least one through hole and blockable with the ball head in the axial direction, the sleeve member covering the at least one through hole; wherein the seat has a first hardness, the sleeve member has a second hardness smaller than the first hardness, an outer circumferential wall of the seat is partially embedded within an inner circumferential wall of the sleeve member.