Hub bearing constant velocity joint in which a radially outer, annular, element of the joint is engaged with an annular hub of a hub bearing unit with a flange at a first end thereof by means of a clamping system including a screw element assembled inside the annular joint element and able to be operated on the outer side through the annular hub so as to screw it inside a second end of the hub until it prestresses the rolling bodies of the hub bearing unit, while the transmission of torque is ensured by a splined coupling between the joint element and the second end of the hub; the screw element is axially locked against an annular shoulder formed on the inside of the joint element, on the opposite side to the annular hub, by means of an elastic ring engaged with at least one annular seat formed on the inside of the joint element.

A clamping system for a hub bearing assembly includes a screw element configured to engage with a threaded section formed on a flanged hub of a bearing unit. The screw element includes a flange-shaped head configured to cooperate with an annular element of the bearing unit and axially constrain the flanged hub and the annular element, an elastic ring, and at least one annular seat for the elastic ring. The at least one annular seat is formed radially on the inside of the annular element or on the outside of the flange-shaped head along a radially outer peripheral edge of the flange-shaped head.