Stepper motor specifications

Hi

I am looking for surplus steppers for my little mill conversion. As I am
sure you have notoced, surplus stepper motors frequently show a voltage
and current rating on them but nothing else. if you are lucky, you can
look up the part and discover the torque and such. Frequently that is
not the case.

The question then is: given just the voltage and current rating, what
can I deduce? In particular what can I infer about the motor torque?
Also, do the manufacturers generally mean these are the maximum ratings
for just one coil?

As an example, I came across a motor rated 1.4V, 3.8A, it has eight
wires. I would guess this to have relatively low torque and that the
rating refers to a single coil.

Any thoughts?

Pete