A freewheel cage (1) arranged between two concentric metal machine components (2,3) and comprising at least one reinforcing ring (14) and a plurality of segments (4) made of an injectable or castable material and arranged on a periphery of the reinforcing ring (14), said segments (4) comprising pockets (7) for locking elements (8) defined between axial crossbars (5) and end sections (6) integral thereto, the locking elements (8) being spring-mounted between facing locking surfaces (9, 10) of the machine components (2,3) while expansion gaps (18) are formed between consecutive segments (4), and at least one sliding surface (20) associated to the freewheel cage (1) is arranged on a periphery thereof for sliding contact with a cylindrical surface (10) of one of the machine components (3), the reinforcing ring (14) is inserted into grooves (15) of the segments (4), and the segments (4) and the reinforcing ring (14) respectively comprise recesses (16) and projections (17) which engage positively with one another, characterized in that the coefficient of thermal expansion of the reinforcing ring (14) is substantially equal to that of the machine components (2,3), and the sliding surface (20) is formed on the reinforcing ring (14).