Clamping device

Clamping device for securing a clamping bolt (11) on a machine table, a fixation plate or the like, comprising a housing (10) which can be inserted the tightening bolt (11), and a clamping mechanism to secure the clamping bolt (11) in the housing (10), the clamping mechanism one collet with several fastening tabs (13) by one of its ends are secured in a retaining element (14) disposed in the housing (10) and its free end are movable between a position of radially inner support and a position outside release and can be immobilized by a piston (5) in the clamping position, characterized in that the retaining element ( 14) with the locking tabs (13) is disposed in the housing (10) movable axially and radial clearance.