A torsional hysteretic damper for braced frames having; • At least one cylindrical energy dissipater with extended tips • at least one torsion arm connected with a header plate, • A support plate, which protects energy dissipater against bending and which is welded to a base plate, • A torsional restraint plate, which restricts torsional movement at distal ends of cylindrical energy dissipater and which is connected to base plate, • At least one rail composed of two plates, that is connected to a connection plate, • At least one slider block having low friction slider pads on two sides where each slider block are coupled to an arm by means of a mounting shaft and a low friction bearing, • Cylindrical mounting shafts • The base plate connected to frame beam, • The connection plate that is able to shift laterally by means of guide strips, • A cover plate connected to the base plate, • The torsional restraint plate that is provided with guide strips screwed to the cover plate from other side so as to enable the connection plate to move in horizontal direction and to prevent bending of supports, • Shaped stainless steel plates distributed at two sides of the connection plate, • Thin stainless steel plates coupled to each plate of a rail by means of screws, • The header plate connects the at least one torsion arm to the tip of energy dissipater, • The low friction slider pads being part of the slider block • A screwed low friction slider band that is a piece of guide strips, • A low friction bearing placed at the connection points of the energy dissipater and the support plate, • A second low friction bearing coupling the slider block, • A horizontal plate which is connected to the connection plate which transfers the damping force transversally, wherein the translational movement at the end points of the arms are converted into twisting at the cylindrical energy dissipater. • At least one cylindrical energy dissipater with extended tips • at least one torsion arm connected with a header plate, • A support plate, which protects energy dissipater against bending and which is welded to a base plate, • A torsional restraint plate, which restricts torsional movement at distal ends of cylindrical energy dissipater and which is connected to base plate, • At least one rail composed of two plates, that is connected to a connection plate, • At least one slider block having low friction slider pads on two sides where each slider block are coupled to an arm by means of a mounting shaft and a low friction bearing, • Cylindrical mounting shafts • The base plate connected to frame beam, • The connection plate that is able to shift laterally by means of guide strips, • A cover plate connected to the base plate, • The torsional restraint plate that is provided with guide strips screwed to the cover plate from other side so as to enable the connection plate to move in horizontal direction and to prevent bending of supports, • Shaped stainless steel plates distributed at two sides of the connection plate, • Thin stainless steel plates coupled to each plate of a rail by means of screws, • The header plate connects the at least one torsion arm to the tip of energy dissipater, • The low friction slider pads being part of the slider block • A screwed low friction slider band that is a piece of guide strips, • A low friction bearing placed at the connection points of the energy dissipater and the support plate, • A second low friction bearing coupling the slider block, • A horizontal plate which is connected to the connection plate which transfers the damping force transversally, wherein the translational movement at the end points of the arms are converted into twisting at the cylindrical energy dissipater.