Internal Freewheels FD are sprag freewheels without an inner ring. The customers hardened and ground shaft is used as the inner track. The standard type does not have bearing support. In the case of the standard type, every second sprag has been be replaced by a cylindrical roller; this freewheel can accept radial forces. Nominal torques up to 2 400 Nm. The torque is transmitted on the outer ring by press fit.