Abstract: The present invention relates to a subjection sectioned mechanical-hydraulic coupler to seal oil and gas wells including in association: a flange pistons holder; a support bracket attached to the flange pistons holder; a plurality of pistons housed inside the flange pistons holder, the pistons act on a washer plate housed inside the support bracket when a hydraulic fluid is injected through the flange pistons holder; and a tightening crown located inside the support bracket, the tightening crown located under the washer plate, wherein the tightening crown slides down over inside walls of the support bracket when it is pushed by the washer plate.