This study investigates the overstrength factor (Ω of an innovative-shaped metallic shear damper designed for enhancing seismic resilience in concentrically braced frames (CBFs . To evaluate the influence of geometric variables-including web/flange thickness, damper height, and slenderness ratios (λw, λf, λℎ-a parametric study was conducted using 100 finite element models validated against experimental tests. The results demonstrate that all considered-shaped dampers exhibit Ω values exceeding 1.5, surpassing the A SC recommendations for shear links. t was found that while increasing web plate thickness significantly improves ultimate strength (up to 2.35 times, it tends to reduce Ω . Conversely, increasing flange thickness enhances both ultimate strength and Ω, challenging current guidelines that often neglect flange contributions. Specifically, within the flange slenderness range of 10 ≤ λf ≤ 15, the reduction rate of structural parameters is most significant. To ensure balanced seismic performance and economic efficiency, this study proposes designing dampers with a web slenderness ratio of λw ≤ 33 and a strength ratio of Ψ > 5.0. These findings offer uuantitative insights for refining design guidelines to accurately reflect the damper’s overstrength capacity.