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## 42STH38 NEMA-17 Bipolar Stepper with 99.51:1 Gearbox

ID: 3329_0
Recommended for new designs: This product is sourced from another supplier, but it (or a similar replacement with a compatible form, fit and function) is estimated to be available for as long as it is available from the supplier.

This bipolar stepper with a rear shaft and a planetary gearbox has a 0.018° step angle and 48 kg·cm of torque at low speeds.

## $48.00 Quantity Available: 233 Qty Price 5$46.08
10 $44.16 25$43.20
50 $42.24 100$41.28

This NEMA-17 motor has an integrated Planetary gearbox with a 991044/2057 :1 ratio.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.

At the output of the gearbox, the step angle is approximately 0.018°. 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 Connection & Compatibility tab for wiring details.

At 1.7 Amps, this gearbox stepper can produce a maximum torque of 250 kg-cm. However, the gearbox is only rated for 48 kg-cm of continuous torque, and 100 kg-cm for brief overloads. Loading this gearbox stepper beyond the torque rating of the gearbox will shorten its useful life.

#### Connection

This motor must be controlled by a constant current or chopper drive controller. You can find a list of suitable controllers on the Connection & Compatibility tab. There you will also find compatible attachments such as encoders, mounting hardware, and transmission hardware.

#### Warning

 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 Controllers

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 counter-clockwise 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.

Function 3329STC10011067
A Black A A
Green B
B Red B C
Blue D

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 $90.00 116 Step (40-Bit Signed) 1 1/16 steps/sec 250000 1/16 steps/sec 4 A STC1000_0$55.00 116 Step (40-Bit Signed) 1 1/16 steps/sec 115000 1/16 steps/sec 4 A
STC1002_0 $80.00 116 Step (40-Bit Signed) 1 1/16 steps/sec 115000 1/16 steps/sec 8 A STC1003_0$40.00 1/16 Step (40-Bit Signed) 1 1/16 steps/sec 115000 1/16 steps/sec 4 A

#### Encoders

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 Push-Pull (Single-Ended) 300 CPR 6000 RPM ENC4109_0$10.00 Push-Pull 40 CPR 6000 RPM

#### Shaft Couplers

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 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 #### Pulleys and Sprockets 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

#### Rotary Bearings

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 Brackets

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 Specifications Motor Properties Motor Type Bipolar Stepper Manufacturer Part Number 42STH38-1684B / 36JXS60K99.51 Step Angle 0.018° Step Accuracy ± 5 % Holding Torque 48 kg·cm Rated Torque 48 kg·cm Maximum Motor Speed 20 RPM Electrical Properties Recommended Voltage 12 V DC Rated Current 1.7 A Coil Resistance 1.7 Ω Phase Inductance 3.2 H 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 99 10442057 : 1 Backlash Error 1 12° Maximum Strength of Gears 48 kg·cm Shaft Maximum Axial Load 49.1 N Shaft Maximum Radial Load 98.1 N #### Documents #### Projects #### Here's a list of our bipolar stepper motors: 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 103121 : 1 3322_0$38.00 0.018° 32 kg·cm 20 RPM 12 V DC 6 mm 243.6 g 99 10442057 : 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 5 211 : 1 3326_0$42.00 0.13° 30 kg·cm 150 RPM 12 V DC 8 mm 502 g 13 212289 : 1
3327_0 $44.00 0.067° 30 kg·cm 80 RPM 12 V DC 8 mm 503 g 26 103121 : 1 3328_0$46.00 0.035° 48 kg·cm 40 RPM 12 V DC 8 mm 564 g 50 43974913 : 1
3329_0 $48.00 0.018° 48 kg·cm 20 RPM 12 V DC 8 mm 564 g 99 10442057 : 1 3330_0$28.00 0.9° 11.2 kg·cm 1075 RPM 12 V DC 14 695 g
3332_0 $70.00 0.42° 46.6 kg·cm 375 RPM 12 V DC 12 mm 1.2 kg 4 14 : 1 3333_0$72.00 0.12° 150 kg·cm 116 RPM 12 V DC 12 mm 1.3 kg 15 310 : 1
3334_0 $74.00 0.023° 240 kg·cm 25 RPM 12 V DC 12 mm 1.5 kg 76 4964 : 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 58 5.2 kg 3340_0$20.00 0.9° 3.3 kg·cm 1075 RPM 12 V DC 5 mm 288 g