We develop a unified geometric formulation of the strong nuclear interaction within the Superstring Fabric Spacetime (SFS) framework, in which both hadronic confinement and nuclear binding arise from axial torsional tension stored in the underlying spacetime fabric. In this description, each nucleon carries axial tension characteristics whose geometric compatibility depends on its isospin structure, such that stable axial links form exclusively between complementary proton–neutron configurations. As a result, nuclear forces emerge as short-range, saturating geometric interactions without invoking meson exchange, residual color forces, or phenomenological potentials. Closed-form expressions for nuclear binding energies are derived from a minimal set of geometric parameters, including a saturated axial coordination number and a universal axial tension scale. When applied to light and intermediate nuclei, the model quantitatively reproduces the binding energies of C-12 and O-16 through natural surface-depletion corrections, while correctly predicting the binding maximum near 56Fe as a consequence of full axial saturation. For heavy nuclei, accumulated global axial strain leads to a geometric reduction of effective binding and yields a fission criterion with a critical mass number near A ∼ 200, consistent with the observed instability of actinides such as U-238. The SFS framework thus provides an analytic, falsifiable, and geometrically transparent reinterpretation of the strong interaction across nuclear scales, complementing quantum chromodynamics while offering new insight into nuclear saturation, stability, and fission as topological phenomena of spacetime itself. This is the original version of the manuscript. A revised and updated version (Version 2) is available at: https://doi.org/10.5281/zenodo.18498802 Related Works (Superstring–Fabric Spacetime (SFS) Program): Core SFS model formulation (SFS Model):https://doi.org/10.5281/zenodo.17485070 Extended quantum–geometric framework (SFS Model):https://doi.org/10.5281/zenodo.17864031 Geometric origin of electromagnetism (SFS Model):https://doi.org/10.5281/zenodo.18182324 Geometric Interpretation of Low-Energy Nuclear Fusion in (SFS Model): https://doi.org/10.5281/zenodo.18384888