Hi!
Sorry for the delay in replying, I’ve been a bit disconnected for a few months.
I have just checked the BOM links and I can assure you that the motors to which these links redirect are the correct ones at this right moment.
It draws my attention the case of geared motors, that apparently the manufacturer has replaced the total torque value given by the set of gearbox and motor by the torque value of the motor without gearbox. However, the gearbox being a 5:1, multiplies approximately by 5 the 25Ncm of the motor without gearbox, obtaining approximately the old 121Ncm.
About what you say about the specification of the supply voltage. Stepper motors generate torque by controlling the current in their coils, not directly with the voltage. Drivers are responsible for regulating this current, using a supply voltage (within their range) to be able to “push” the desired current to the motor. Therefore, the supply voltage is more of a driver specification than an inherent limitation of the motor itself.
Hope it helps!