Abstract: The invention is a missile fuze. A slider carries a detonator so that it is normally out of alignment with the firing train. The slider is locked in position by cylinders. The cylinders contain pistons which respond to centrifugal force to move radially outwardly, in each instance moving the center of gravity of each cylinder-piston combination outwardly. When the centrifugal force exerted on such combinations becomes sufficiently great the combinations move outwardly and unlock the slider, which then positions the detonator in alignment with the firing train. In order to be displaced radially outwardly the cylinders must overcome the force of retainer weights which are mounted and proportioned in such manner as to respond to centrifugal force and spin to increase the retaining thrusts.