This NEMA 17-size hybrid bipolar stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 1.7 A at 2.8 V, allowing for a holding torque of 3.7 kg-cm (51 oz-in).

This hybrid bipolar stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 1.7 A at 2.8 V, allowing for a holding torque of 3.7 kg-cm (51 oz-in). The motor has four color-coded wires terminated with bare leads: black and green connect to one coil; red and blue connect to the other. It can be controlled by a pair of suitable H-bridges (one for each coil), but we recommend using a bipolar stepper motor driver. Our DRV8825 stepper motor driver carrier is probably the best option for this stepper motor.

5mm Pololu universal aluminum mounting hub on a stepper motor with a 5mm-diameter output shaft.

NEMA 17 stepper motor (item #1200) mounted with a Pololu stamped aluminum L-bracket for NEMA 17 stepper motors.

Bipolar stepper motor wires are terminated with bare leads.

Bipolar stepper motor wiring diagram.

Our 5 mm universal mounting hub can be used to mount objects on the stepper motor’s 5 mm-diameter output shaft, and our NEMA 17 aluminum bracket offers a variety of options for mounting this stepper motor in your project. This NEMA17 stepper motor is also available with threaded rod output shafts in lengths of 18 cm,28 cm, or 38 cm that convert its rotations into linear motion of the included traveling nut.

Specifications

Size: 42.3 mm square × 38 mm, not including the shaft (NEMA 17)
Weight: 285 g (10 oz)
Shaft diameter: 5 mm “D”
Steps per revolution: 200
Current rating: 1.68 A per coil
Voltage rating: 2.8 V
Resistance: 1.65 Ω per coil
Holding torque: 3.7 kg-cm (51 oz-in)
Inductance: 3.2 mH per coil
Lead length: 30 cm (12″)
Output shaft supported by two ball bearings

More specifications are available in the datasheet (39k pdf).

Dimensions

The following diagram shows the stepper motor dimensions in mm. The dimension labeled “length” is 38 mm. The output D-shaft has a 5 mm diameter with a section that is flattened by 0.5 mm. This shaft works with our 5 mm universal mounting hub.

The inside of a bipolar stepper motor.

Stepper Motor Applications

Stepper motors are generally used in a variety of applications where precise position control is desirable and the cost or complexity of a feedback control system is unwarranted. Here are a few applications where stepper motors are often found:

Printers
CNC machines
3D printer/prototyping machines (e.g. RepRap)
Laser cutters
Pick and place machines
Linear actuators
Hard drives

Pololu’s assortment of stepper motors.

Dimensions

Size:	42.3 mm square × 38 mm (NEMA 17)¹
NEMA size:	17
Weight:	285 g
Shaft diameter:	5 mm

General specifications

Shaft type:	5 mm "D"
Steps per revolution:	200
Current rating:	1680 mA²
Voltage rating:	2.8 V
Holding torque:	51 oz·in
Resistance:	1.65 Ohm²
Inductance per phase:	3.2 mH
Number of leads:	4
Lead length:	30 cm

File downloads

SY42STH38-1684A stepper motor datasheet (39k pdf)

Motor Specifications
Torque	3.7 kg-cm (51 oz-in)
Shaft Diameter	5mm
Steps per revolution	200
Electrical Specifications
Output Voltage	2.8 V
Output Current	1.68 A per coil
Resistance	1.65 Ω per coil
Inductance	3.2 mH per coil
Physical Attributes
Weight	285 g (10 oz)
Size	42.3 mm square × 38 mm, not including the shaft (NEMA 17)
Length	Lead Length-30 cm (12″)
Additional Information
Warranty