  We find a possibility of a weak universality of spin-glass phase transitions
in three-dimensional $\pm J$ models. The Ising, the XY and the Heisenberg
models seem to undergo finite-temperature phase transitions with a ratio of the
critical exponents $\gamma/\nu \sim 2.4$. Evaluated critical exponents may
explain corresponding experimental results. The analyses are based upon
nonequilibrium relaxation from a paramagnetic state and finite-time scaling.
