NEMA 17 Stepper Motor 42BYGH40-1704 | 0.4 Nm (4 kg-cm) Torque | 2-Phase 1.7A High-Precision Motor

Overview:

The NEMA 17 42BYGH40-1704 is a high-quality 2-phase bipolar stepper motor designed for precision motion control. With a holding torque of 0.4 Nm (4 kg-cm) and a compact 40 mm body length, it delivers powerful and stable performance ideal for 3D printers, CNC machines, laser engravers, and robotics.

Its low vibration and accurate step angle ensure smooth and reliable movement — making it a popular choice for both hobbyists and industrial users.

Key Features:

• Standard NEMA 17 Size – Fits most 3D printer and CNC mounts

• High Holding Torque (0.4 Nm / 4 kg-cm) – Provides strong, stable motion

• 2-Phase Bipolar Design – Compatible with A4988, DRV8825, TMC2208, and other drivers

• 1.8° Step Angle (200 Steps/Revolution) – Ensures precise positioning

• Smooth Operation – Low noise and vibration for accurate results

• Durable Construction – Long-life bearings and high-temperature windings

Technical Specifications:

• Model: 42BYGH40-1704

• Motor Type: NEMA 17 2-Phase Stepper

• Step Angle: 1.8°

• Steps per Revolution: 200

• Rated Current: 1.7 A/phase

• Holding Torque: 0.4 Nm (≈ 4 kg-cm)

• Resistance: 1.8 Ω/phase

• Inductance: 3.2 mH/phase

• Body Length: 40 mm

• Shaft Diameter: 5 mm (round or D-shaft)

• No. of Wires: 4 (bipolar)

• Connector Type: JST XH or bare leads (varies by batch)

• Weight: Approx. 280 g

Applications:

• 3D printers (X, Y, Z, extruder motors)

• CNC milling and engraving machines

• Robotics and automation arms

• Laser cutters and plotters

• Camera sliders and motion platforms

Why Choose This Motor:

This NEMA 17 42BYGH40-1704 stepper motor provides the perfect balance between power, accuracy, and size. Whether you’re upgrading your 3D printer or building a new CNC setup, it offers dependable torque, consistent step accuracy, and a smooth drive experience with any standard stepper driver.