Abstract: A manually actuable blind riveting tool comprises a housing carrying a sleeve member at the front end thereof. Fixed in the front sleeve member is a mouthpiece member for accommodating a pulling mandrel of a blind rivet while a collet for clamping the pulling mandrel is arranged in the front sleeve member behind the mouthpiece member. The collet is connected to a movable pulling plunger which extends through the housing of the tool and which in its interior has a discharge passage for receiving mandrels after they have been torn off a respective rivet. Two pivotal levers are mounted on the housing for applying an axial force to the pulling plunger to produce a stroke movement thereof during the actual riveting operation. The stroke movement of the pulling plunger is adjustable by a variation in the spacing between the mouthpiece member and the collet.