Stepper Motor Specs

I have a 34 size stepper motor made by Superior Electric. The label says:

SloSyn Synchronous/Stepping Motor
Type HS50L-1046J 120 oz in
5V 4A 144 S/R
It has 6 wires and the body is 3.4" dia x 5.3" long, .

I have search the web generally and Superior Electrics web site and can't
find any more detail on this motor.
My question is about the 120 oz in - what does this mean? From the size of
the motor and the 5V 4A I would expect it to be a good deal more powerful
that.

Regards,

Dave.