Space or power constraints?

If this is the case, HT Servo has a solution in the form of its 4418 Xtreme Torque stepper motor series, which offers up to 35% more torque when compared to steppers of similar mechanical dimensions.

The 4418 stepper motor series is available in five different stack lengths – from the nimble 4418F which comes in at just 1.02" (25.9mm) in length to the powerful 4418L which boasts 100 oz-in of holding torque at just 1.89" (48mm). It is also possible is to customise the motor performance and create new windings at no extra cost.