To ensure optimal performance and reliability, consider the following four critical factors:

1. Holding Torque & NEMA Size
Match the motor's torque to your load. Generally, NEMA 8-17 sizes are ideal for torque requirements below 8kg.cm, while NEMA 23/24 are more suitable for the 8-30kg.cm range.

2. Operating Speed
Stepper torque drops as speed increases. For best stability, keep the operating speed between 300–600 RPM.

3. Step Angle & Precision
Choose 1.8° for standard use or 0.9° for higher precision. 3-phase motors (1.2°) offer smoother motion and lower vibration.

4. Mechanical Customization
Confirm shaft diameter (D-cut, round, or keyway), shaft length, and environmental needs (IP rating/High temperature).

For more details, please read:

https://www.motechmotor.com/knowledge_baseDetail-0702-141.html