Abstract: Hydraulically actuated quick release base mounted clamp particularly capable of use for clamping interchangeable production heat treating induction coils to produce intimate pressurized electrical conductive contact between elongated base mounted and induction coil bus bars. A central short stroke hydraulic cylinder produces only slight pivotal clamping engagement of dual laterally spaced clamp arms, the pivots of which can be linearly laterally retracted to clearance position upon release of hydraulic pressure. A cross shaft having a flatted engagement by the rigidly mounted cylinder piston head and a pivot cross shaft having flatted ends adapted to slide in slotted keyways upon release of actuating pressure provide for lateral movement of the clamp arm assembly to a clearance position while the actuating cylinder remains in its fixed position.