  We calculate single top-quark production at hadron colliders via the
chromo-magnetic flavor-changing neutral current couplings $\bar tcg$ and $\bar
tug$. We find that the strength for the anomalous $\bar tcg$ ($\bar tug$)
coupling may be probed to $\kappa_c / \Lambda = 0.092 {TeV}^{-1}$ ($\kappa_u /
\Lambda = 0.026 {TeV}^{-1}$) at the Tevatron with $2 {fb}^{-1}$ of data and
$\kappa_c / \Lambda = 0.013 {TeV}^{-1}$ ($\kappa_u / \Lambda = 0.0061
{TeV}^{-1}$) at the LHC with $10 {fb}^{-1}$ of data. The two couplings may be
distinguished by a comparision of the single top signal with the direct top and
top decay signals for these couplings.
