What phase inductivity value should my stepper motor have?

Stepper motor phase inductivity varies widely. Even for a given size of stepper motor, such as NEMA17 with a length of 38mm, you can buy widely varying inductivity values even from the same manufacturer:

Both of these have the same holding torque of 80NcmInductivity is not an indicator of motor power! As a general rule, remember:

If you are checking your motor for a shorted winding, if the inductance is below 100**μ**H, you can be pretty sure that the stepper motor is defective.