Those low-resistance bipolar steppers are definitely not meant to be powered from
an Hbridge driver, they are designed for chopper-style bipolar motor drivers like the
A4988.
The "rated voltage 12V" is total nonsense really, these motors have a winding
current and resistance rating, and the only voltage rating is
the maximum the insulation can withstand safely, which is likely to be a lot more than
12V, probably more like 48V for something of this size.
You won't get any decent speed/torque out of the thing without a chopper driver run from a decent
supply voltage (24 or more is typical).
The datasheet has a bug, it lists the winding inductance as 3.5H, whereas it will
be 3.5mH...