The supersymmetric standard model undergoes parity violation in QCD through chiral quark-squark-gluino interactions with non-degenerate masses between left-handed and right-handed squarks. A bound for the mass degeneracy between left-handed and right-handed squarks should exist, since experiments have not shown any parity violation in QCD yet. In this paper, we establish methods of analysis to estimate this bound for each squark. Firstly, we investigate a non-degeneracy bound between mc̃L and mc̃R from experimental data of charmonium decay. Secondly, we evaluate the non-degeneracy bounds for ũR and d̃R from nucleon-meson scattering data, and comment on other squarks. Unfortunately, our results are below current experimental data, and cannot obtain the left-right degeneracy bounds for squark masses. However, we hope that our method is useful for obtaining bounds from future experimental data and research of an origin of parity violation.