Bleeder screw, in particular for a hydraulic braking system of an automobile

摘要

The screw (2) has separated pieces formed of a hollow main body (5) and a conical head shaped piece (6) that are realized by a cold-heading processes without machining, and are assembled for forming a monoblock piece. The conical head shaped piece comprises a channel (18) that is in contact with an annular space (31) of an orifice (3) and an inner space (22) opened toward outer side of the screw. The separated pieces are made of metal or plastic materials.