A forced entry resistant lock, comprising: - a casing with a passage opening for two engagement elements (17, 18), - two engagement elements (17, 18) arranged with respective engagement teeth (19, 20) that have opposite orientations in the configuration for use with the lock in operation, - a movable pivot, to which both of said engagement elements (17, 18) are pivoted, - means for the translation of said movable pivot in a direction for the exit of said engagement elements (17, 18) from inside said casing, in an inactive configuration, toward the outside of said casing, in an intermediate configuration for translation and in a subsequent configuration for use, - means for the rotation in opposite directions of each engagement element (17, 18) from an intermediate configuration for translation to a configuration for use, and - elastic means for contrasting the rotation of said engagement elements (17, 18) from said intermediate configuration to said configuration for use, each engagement element (17, 18) comprising a pivoting portion for the movable pivot wherein said pivoting portion is provided with a through hole for the movable pivot, and an engagement portion, from which the corresponding engagement tooth (19, 20) protrudes, characterized in that a coupling and rotation tab protrudes on the same side as the engagement tooth and an abutment and stroke limiting tab extends radially, in substantially opposite directions, from the pivoting portion of each engagement element (17, 18), and said tabs (30, 31) being shaped so that with respect to the translational motion to exit from said casing that the engagement element (17, 18) performs by being carried by the movable pivot, the coupling and rotation tab couples to an external cover of said casing before the abutment and stroke limiting tab. - a casing with a passage opening for two engagement elements (17, 18), - two engagement elements (17, 18) arranged with respective engagement teeth (19, 20) that have opposite orientations in the configuration for use with the lock in operation, - a movable pivot, to which both of said engagement elements (17, 18) are pivoted, - means for the translation of said movable pivot in a direction for the exit of said engagement elements (17, 18) from inside said casing, in an inactive configuration, toward the outside of said casing, in an intermediate configuration for translation and in a subsequent configuration for use, - means for the rotation in opposite directions of each engagement element (17, 18) from an intermediate configuration for translation to a configuration for use, and - elastic means for contrasting the rotation of said engagement elements (17, 18) from said intermediate configuration to said configuration for use, each engagement element (17, 18) comprising a pivoting portion for the movable pivot wherein said pivoting portion is provided with a through hole for the movable pivot, and an engagement portion, from which the corresponding engagement tooth (19, 20) protrudes, characterized in that a coupling and rotation tab protrudes on the same side as the engagement tooth and an abutment and stroke limiting tab extends radially, in substantially opposite directions, from the pivoting portion of each engagement element (17, 18), and said tabs (30, 31) being shaped so that with respect to the translational motion to exit from said casing that the engagement element (17, 18) performs by being carried by the movable pivot, the coupling and rotation tab couples to an external cover of said casing before the abutment and stroke limiting tab.