Abstract: A torque transmission control device, coupling belleville springs which sandwich friction discs interposed between plural input discs and output discs in a housing. These members are pressed together by a friction adjustment screw set in a desired position to prevent a drive torque, exceeding a predetermined value, from being transmitted from an input to an output. A cap is provided with a rotation limiting opening to fit a protrusion on the friction adjustment screw and with stopper recesses for engaging protrusions formed on the housing to prevent the friction adjustment screw from rotating relative to the housing. This ensures that the predetermined torque value adjusted by the friction adjustment screw does not change during use.