NEMA23 8 wires, DUAL Shaft Stepper Motor, 200 steps per revolution. 0.25" shaft diameter with a ground flat. Holding torque 280 oz/in bipolar, 3 Volts 3 Amps.

and

NEMA23 8 wires, Dual Shaft Stepper Motor, 200 steps per revolution. 0.25" shaft diameter with a ground flat. CNC router or CNC mill retrofit. Holding torque 425 oz-in bipolar, 304 oz-in in Unipolar

for lets say a x3 retrofit to cnc i am sure the torque is probably enough but the shaft seem like small arnt they

i ordred 425 oz/in steppers with a 0.25" shaft. i think they will be fine.

and what about those 280in/oz one for the x and y axis, cuz i would use the 425 one for the z or is the 280 not strong enough