Products for USB Sensing and Control
This NEMA17 motor has an integrated Planetary gearbox with a 50^{4397}/_{4913}:1 ratio. It comes with the rear shaft exposed, so you can mount an encoder or shaft coupler. See the Compatible Products tab for a complete list of attachments.
When connected to a 1067  PhidgetStepper Bipolar HC, the 3328 has a maximum speed of 63 RPM. At the output of the gearbox, the step angle is approximately 0.035°. When using the step angle in calculations, you should derive the exact step angle by dividing 1.8° by the gearbox reduction ratio. See the Compatible Products tab for wiring details.
At 1.7 Amps, this stepper motor can produce a maximum torque of 180 kgcm. However, the gearbox is only rated for 48 kgcm of continuous torque. Loading this gearbox stepper beyond the torque rating of the gearbox will shorten its useful life.
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. 
Motor Properties  

Motor Type  Bipolar Stepper 
Manufacturer Part Number  42STH381684B / 36JXS60K51 
Step Angle  0.035° 
Step Accuracy  ± 5 % 
Holding Torque  48 kg·cm 
Rated Torque  48 kg·cm 
Maximum Motor Speed  63 RPM 
Acceleration at Max Speed (w/1067 Motor Controller) 
1.35E+06 1/16 steps/sec² 
Electrical Properties  
Recommended Voltage  12 V DC 
Rated Current  1.7 A 
Coil Resistance  1.7 Ω 
Phase Inductance  3.2 mH 
Physical Properties  
Shaft Diameter  8 mm 
Rear Shaft Diameter  3.9 mm 
Mounting Plate Size  NEMA  17 
Weight  564 g 
Number of Leads  4 
Wire Length  300 mm 
Gearbox Properties  
Gearbox Type  Planetary 
Gear Ratio  50 ^{4397}⁄_{4913} : 1 
Backlash Error  1 ^{1}⁄_{2}° 
Maximum Strength of Gears  48 kg·cm 
Shaft Maximum Axial Load  49.1 N 
Shaft Maximum Radial Load  98.1 N 
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  $75.00  ^{1}⁄_{16} Step (40Bit Signed)  1 1/16 steps/sec  115000 1/16 steps/sec  4 A  
STC1001_0  $40.00  1/16 Step (40Bit Signed)  1 1/16 steps/sec  115000 1/16 steps/sec  2 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 
3423_0  $7.50  8 mm  Aluminium  4.1 kg·cm  10000 RPM  100 N·m/rad  
3427_0  $7.50  8 mm  Aluminium  60.7 kg·cm  16000 RPM  63 N·m/rad  
TRM4313_0  $2.80  8 mm  Aluminum  35.7 kg·cm  12000 RPM  —  
TRM4334_0  $3.35  8 mm  Aluminium  10 kg·cm  8000 RPM  110 N·m/rad 
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 8mm bore pulleys and sprockets:
Product  Physical Properties  

Image  Part Number  Price  Inner Diameter  Number of Teeth 
TRM4102_0  $2.25  8 mm  22  
TRM4103_0  $2.25  8 mm  32  
TRM4104_0  $2.45  8 mm  44  
TRM4105_0  $3.00  8 mm  60  
TRM4106_0  $3.70  8 mm  80  
TRM4111_0  $2.25  8 mm  12  
TRM4112_0  $3.15  8 mm  24  
TRM4113_0  $4.45  8 mm  34  
TRM4114_0  $6.70  8 mm  50  
TRM4135_0  $1.85  8 mm  10  
TRM4158_0  $3.25  8 mm  44 
Systems with heavy loads or pulley/sprocket assemblies often put a lot of sideways strain on the motor shaft. If you're using this motor to drive such a system, you can use rotary bearings to protect the motor:
Product  Physical Properties  Mechanical Properties  

Image  Part Number  Price  Inner Diameter  Bearing Type  Static Load  Dynamic Load 
TRM4500_0  $4.00  8 mm  Rotary Shaft (Flanged)  1.3 kN  3.3 kN  
TRM4501_0  $4.25  8 mm  Rotary Shaft (Pillow Block)  1.3 kN  3.3 kN 
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 
3338_0  $3.50  NEMA  17  Mild Steel (Coated) 
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 
3304_0  $15.00  3 ^{3}⁄_{4}°  590 g·cm  4105 RPM  12 V DC  5 mm  171 g  —  
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  120 RPM  12 V DC  6 mm  217.5 g  26 ^{103}⁄_{121} : 1  
3322_0  $38.00  0.018°  32 kg·cm  35 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  904 RPM  12 V DC  8 mm  457 g  5 ^{2}⁄_{11} : 1  
3326_0  $42.00  0.13°  30 kg·cm  295 RPM  12 V DC  8 mm  502 g  13 ^{212}⁄_{289} : 1  
3327_0  $44.00  0.067°  30 kg·cm  174 RPM  12 V DC  8 mm  503 g  26 ^{103}⁄_{121} : 1  
3328_0  $46.00  0.035°  48 kg·cm  63 RPM  12 V DC  8 mm  564 g  50 ^{4397}⁄_{4913} : 1  
3329_0  $48.00  0.018°  48 kg·cm  34 RPM  12 V DC  8 mm  564 g  99 ^{1044}⁄_{2057} : 1  
3330_0  $28.00  0.9°  11.2 kg·cm  2150 RPM  12 V DC  ^{1}⁄_{4}″  695 g  —  
3331_0  $20.00  1.8°  11 kg·cm  2150 RPM  12 V DC  ^{1}⁄_{4}″  686 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  2344 RPM  12 V DC  5 mm  288 g  — 