NEMA 17 Stepper Motor 42BYGH40 – High-Torque Short Shaft 0.5Nm Motor

The 42BYGH40 NEMA 17 stepper motor is a compact, high-precision 2-phase 4-wire motor
designed for applications requiring stable torque, low vibration, and reliable performance.
With a holding torque of 0.5Nm and a durable short-shaft structure, this
NEMA 17 motor is widely used in 3D printers, CNC machinery, robotics, and automation systems.
It is fully compatible with mainstream stepper driver NEMA 17 controllers such as DRV8825, A4988, and TMC2209.

Key Features

• High torque: 0.5Nm holding torque
• Short shaft design for compact installations
• 2-phase, 4-wire bipolar structure
• 1.8° step angle for precise positioning
• Compatible with standard stepper driver NEMA 17 modules
• Long service life, low heat, stable operation

1. Motor Dimensions

Body Length	40 mm
Shaft Length	19 mm
Shaft Diameter	5 mm
Mounting Size	42 × 42 mm (NEMA 17)
Mounting Holes	4 × M3
Total Cable Length	750 mm

2. Electrical Specifications

Item	Value
Step Angle	1.8° ±5%
Number of Phases	2
Phase Voltage	6.5 VDC
Phase Current	1.0 A
Phase Resistance	6.5 Ω ±10%
Phase Inductance	13 mH ±20%
Holding Torque	0.5 Nm (5 kg·cm)
Insulation Class	Class B
Insulation Resistance	>100MΩ @ 500V DC
Ambient Temperature	-40°C ~ +60°C
Humidity	15% – 95%
Motor Weight	Approx. 0.3 kg
Operating Voltage	DC 12–36V

3. Wiring Diagram – 2 Phase 4 Wire

Wire Color	Function
Black	A+
Green	A-
Red	B+
Blue	B-

4. Excitation Sequence (Clockwise Rotation)

Step	A+	B+	A-	B-
1	+	+	–	–
2	+	–	–	+
3	–	–	+	+
4	–	+	+	–

Applications

• 3D printers (extruder & Z-axis NEMA 17 motor)
• CNC mini-machines
• Automation equipment
• Robotics actuators
• Linear guide + stepper driver NEMA 17 systems

Why Choose the 42BYGH40 NEMA 17 Stepper Motor?

It provides an excellent balance of torque, speed, durability, and cost, making it an ideal choice for engineers
looking for a reliable nema 17 stepper motor compatible with standard motion-control drivers.

Download Datasheet

Download the full specification sheet for detailed parameters, wiring guide, and performance curves.

📄 Download PDF Datasheet