28BYJ-48 is the most commonly used stepper motor because of its compact size, 5V power supply (that can be provided by any controller), and a high level of control. It has a stride angle of 5.625°/64, hence it will make 64 steps to complete one rotation (as every step covers  5.625) so it has a high level of control. This stepper motor has 4 coils unipolar arrangement (as it is 4 phase motor) and each coil is rated for +5V power supply so it can be controlled easily controlled by any microcontroller. 

28BYJ-48 stepper motors consume high current so motor driver like ULN2003 Motor driver module is mandatory to drive this motor. It consumes +5V so can not give high torque, for high torque prefer NEMA17.  

Specification

• Rated voltage supply: +5V
• No of phase: 4
• Stride angle: 5.625°/64
• Speed variation ratio: 1/64
• Pull-in torque: 300 gf.cm
• Friction torque: 600-1200 gf.cm
• Self-positioning torque: >34.3mN.m
• In-traction torque: >34.3mN.m (120Hz)
• DC resistance: 50Ω±7% (25°C)
• Insulated resistance: >10MΩ (500V)
• Insulated power: 600VAC/1mA/1s
• Frequency: 100Hz
• Idle in-traction frequency: >600Hz
• Idle out-traction frequency: >1000Hz
• Insulation grade: A

Application

• DIY robotics projects
• CNC machines and 3D printers
• Machines that need precise control
• Motor and security camera
• DVD players