This NEMA23 motor generates 12.6 kgcm of holding torque at 2.8 Amps. It comes with the rear shaft exposed, so you can mount an encoder or shaft coupler. See the Connection & Compatibility tab for a complete list of attachments.
Connecting the motor directly to a power supply will destroy the motor and void the warranty. If you want to check your motor make sure it is connected to a constant current / chopper drive controller. 
This motor must be controlled by a stepper motor controller. This diagram shows how to connect the motor wires to the controller to produce a clockwise rotation in the stepper motor when increasing position. To wire for counterclockwise rotation when increasing position, reverse the red and blue wires.
Note: Make sure to unplug the power cord from the motor controller before switching wires around.

The following stepper controllers can be used to drive this motor:
Product  Controller Properties  Electrical Properties  

Image  Part Number  Price  Motor Position Resolution  Stepper Velocity Resolution  Stepper Velocity Max  Available Current per Coil Max 
1067_0B  $90.00  ^{1}⁄_{16} Step (40Bit Signed)  1 1/16 steps/sec  250000 1/16 steps/sec  4 A  
STC1000_0  $55.00  ^{1}⁄_{16} Step (40Bit Signed)  1 1/16 steps/sec  115000 1/16 steps/sec  4 A  
STC1002_0  $80.00  ^{1}⁄_{16} Step (40Bit Signed)  1 1/16 steps/sec  115000 1/16 steps/sec  8 A  
STC1003_0  $40.00  1/16 Step (40Bit Signed)  1 1/16 steps/sec  115000 1/16 steps/sec  4 A 
The rear shaft of this motor can be equipped with an encoder for applications where you need to keep track of the exact position, velocity, or acceleration of the motor. The mounting holes on the back of this motor are compatible with the following encoders:
Product  Encoder Properties  

Image  Part Number  Price  Output Circuit Type  Encoder Resolution  Encoder Speed Max 
3531_0  $25.00  PushPull (SingleEnded)  300 CPR  6000 RPM  
ENC4109_0  $10.00  PushPull  40 CPR  6000 RPM 
If you need to connect the main shaft of this motor to the shaft of another device, you can use a shaft coupler:
Product  Physical Properties  

Image  Part Number  Price  Inner Diameter  Material  Coupling Rated Torque  Coupling Rated Speed  Torsional Stiffness 
TRM4312_0  $2.80  ^{1}⁄_{4}″  Aluminum  35.7 kg·cm  12000 RPM  — 
If you're using this motor to drive a rotary system that requires a lot of torque, you may be interested in pulleys and sprockets. By using a two pulleys or sprockets of different sizes, you can increase the gear ratio of the motor. Pulleys and sprockets can also be used to transmit the motor's rotation over a long distance. For more guidance on building a transmission system, visit our Rotary Motion Primer. Here is a list of our 1/4" bore pulleys and sprockets:
Product  Physical Properties  

Image  Part Number  Price  Inner Diameter  Number of Teeth 
TRM4101_0  $2.45  ^{1}⁄_{4}″  22  
TRM4165_0  $2.00  ^{1}⁄_{4}″  12 
Mounting this motor to a flat surface is easy with these metal mounting brackets. The holes on the bracket match those on the back of the motor, as well as the ones on the front of the gearbox. The following brackets will fit the mounting holes on this motor:
Product  Physical Properties  

Image  Part Number  Price  Mounting Plate Size  Material 
3339_0  $4.00  NEMA  23  Mild Steel (Coated) 
Motor Properties  

Motor Type  Bipolar Stepper 
Manufacturer Part Number  57STH562804B 
Step Angle  1.8° 
Step Accuracy  ± 5 % 
Holding Torque  12.6 kg·cm 
Rated Torque  11 kg·cm 
Maximum Motor Speed  2150 RPM 
Electrical Properties  
Recommended Voltage  12 V DC 
Rated Current  2.8 A 
Coil Resistance  900 mΩ 
Phase Inductance  2.5 mH 
Physical Properties  
Shaft Diameter  ^{1}⁄_{4}″ 
Rear Shaft Diameter  3.9 mm 
Mounting Plate Size  NEMA  23 
Weight  686 g 
Number of Leads  4 
Wire Length  300 mm 
Product  Motor Properties  Electrical Properties  Physical Properties  Gearbox Properties  

Image  Part Number  Price  Step Angle  Rated Torque  Maximum Motor Speed  Recommended Voltage  Shaft Diameter  Weight  Gear Ratio 
3320_0  $16.00  1.8°  520 g·cm  426 RPM  12 V DC  5 mm  111.4 g  —  
3321_0  $36.00  0.067°  14 kg·cm  80 RPM  12 V DC  6 mm  217.5 g  26 ^{103}⁄_{121} : 1  
3322_0  $38.00  0.018°  32 kg·cm  20 RPM  12 V DC  6 mm  243.6 g  99 ^{1044}⁄_{2057} : 1  
3323_0  $16.00  1.8°  1.2 kg·cm  2150 RPM  12 V DC  5 mm  200 g  —  
3324_0  $16.00  1.8°  3.3 kg·cm  2150 RPM  12 V DC  5 mm  289 g  —  
3325_0  $40.00  0.35°  18 kg·cm  415 RPM  12 V DC  8 mm  457 g  5 ^{2}⁄_{11} : 1  
3326_0  $42.00  0.13°  30 kg·cm  150 RPM  12 V DC  8 mm  502 g  13 ^{212}⁄_{289} : 1  
3327_0  $44.00  0.067°  30 kg·cm  80 RPM  12 V DC  8 mm  503 g  26 ^{103}⁄_{121} : 1  
3328_0  $46.00  0.035°  48 kg·cm  40 RPM  12 V DC  8 mm  564 g  50 ^{4397}⁄_{4913} : 1  
3329_0  $48.00  0.018°  48 kg·cm  20 RPM  12 V DC  8 mm  564 g  99 ^{1044}⁄_{2057} : 1  
3330_0  $28.00  0.9°  11.2 kg·cm  1075 RPM  12 V DC  ^{1}⁄_{4}″  695 g  —  
3332_0  $70.00  0.42°  46.6 kg·cm  375 RPM  12 V DC  12 mm  1.2 kg  4 ^{1}⁄_{4} : 1  
3333_0  $72.00  0.12°  150 kg·cm  116 RPM  12 V DC  12 mm  1.3 kg  15 ^{3}⁄_{10} : 1  
3334_0  $74.00  0.023°  240 kg·cm  25 RPM  12 V DC  12 mm  1.5 kg  76 ^{49}⁄_{64} : 1  
3335_0  $60.00  1.8°  30 kg·cm  200 RPM  30 V DC  12 mm  1.8 kg  —  
3336_0  $80.00  1.8°  106 kg·cm  1500 RPM  30 V DC  ^{5}⁄_{8}″  5.2 kg  —  
3340_0  $20.00  0.9°  3.3 kg·cm  1075 RPM  12 V DC  5 mm  288 g  — 