The disc has a friction ring (1) around an inner support (5). The friction ring inner rim (6) and the support outer circumference (7) each have a number of matching recesses (8) into which fitting-springs (9) are inserted. The assembly is secured axially by disc washers (10) on each side, which partly overlap the recess (8) outer edges. The washers and fitting springs are held in place axially by a bolt (11) secured by a nut (12).
