  We study the bounds that can be obtained on four-fermion contact terms from
the experimental data for (e+ p -> \bar{nu} X) obtained at HERA and (p \bar{p}
-> e \nu), measured at TEVATRON. We compare these bounds with the ones
available in the literature. Finally, we apply these results to study the
compactification radius in theories with large extra dimensions and we obtain
the bound M_c >= 3.3 TeV.
