This Nema 23 stepper motor with 55mm body and 2.8A rated current, integrated with a 54mm Planetary gearbox of 10:1 gear ratio. It's a good solution to applications that with special space but need low speed and/or high torque.
Electrical Specification

*Manufacturer Part Number: 23HS22-2804S-HG10
*Motor Type: Bipolar Stepper
*Step Angle: 0.18 deg
*Holding Torque without Gearbox: 103Ncm(146oz.in)
*Rated Current/phase: 2.8A
*Phase Resistance: 0.9ohms
*Voltage: 2.5V
*Inductance: 2.8mH ± 20%(1KHz)

Gearbox Specifications

*Gearbox Type: Planetary
*Gear Ratio: 10 : 1
*Efficiency: 85%
*Backlash at No-load: 0.8°
*Max. Permissible Torque: 6Nm(849.7oz.in)
*Moment Permissible Torque: 12Nm(1699oz.in)
*Max. Radial Load: 250N
*Ambient Temperature: -10 - 90℃
*Insulation Class: B
*Noise: *Life: 20000 h

Physical Specifications

*Frame Size: 57 x 57mm
*Motor Length: 55mm
*Gearbox Length: 54mm
*Shaft Diameter: Φ14mm
*Shaft Length: 34mm
*Key-way Length: 25mm
*Number of Leads: 4
*Lead Length: 320mm
*Weight: 1500g

Connection

Black(A+), Green(A-), Red(B+), Blue(B-)

Warning:

Make sure the motor connect to a constant current or chopper drive controller before you test motor.
Connecting the motor directly to a power supply will destroy the motor.