NEMA 17 Stepper Motor 42BYGH40

NEMA 17 Stepper Motor  42BYGH40

The 42BYGH40 is a two-phase bipolar hybrid motor featuring a 1.8° (200 steps/rev) step angle and a 40 mm motor length. It draws 1.5 A per phase with phase resistance 2 Ω (±10%), has phase inductance 3 mH – 3.2 mH (±20%), and produces 0.4 Nm holding torque. Equipped with a 5 mm D-type shaft, the motor offers insulation resistance ≥ 100 MΩ @ 500 VDC and dielectric strength 500 VAC for 1 min. It supports continuous operation with temperature rise ≤ 80 °C, operating ambient –20 °C to +50 °C, storage –20 °C to +70 °C, and utilizes a standard 4‑lead bipolar wiring configuration.

Features

• 1.8° (200 steps/rev) step angle with ±5 % accuracy.
• Bipolar 2-phase (4‑lead) microstepping-compatible wiring.
• Rated current 1.5 A per phase.
• Phase resistance 2 Ω (±10%).
• Phase inductance 3 mH – 3.2 mH (±20%).
• Holding torque 0.4 Nm.
• 5 mm D-type shaft for secure coupling.
• High insulation (≥ 100 MΩ @ 500 VDC) and dielectric capability (500 VAC / 1 min).
• Designed for continuous duty with ≤ 80 °C rise in –20 °C to +50 °C ambient.

Specifications

Parameter	Value
Model	42BYGH40
Step Angle	1.8° (200 steps/rev)
Step Accuracy	±5 %
Phases	2 (bipolar, 4‑wire)
Rated Current	1.5 A/Phase
Phase Resistance	2 Ω (±10 %)
Resistance Accuracy	±10 %
Insulation Resistance	≥ 100 MΩ @ 500 VDC
Phase Inductance	3 mH – 3.2 mH (±20 %)
Inductance Accuracy	±20 %
Holding Torque	0.4 Nm
Detent Torque	0.016 Nm
Rotor Inertia	350 g·cm² – 450 g·cm²
Temperature Rise	≤ 80 °C
Ambient Temperature Range	–20 °C – +50 °C
Storage Temperature Range	–20 °C – +70 °C
Dielectric Strength	500 VAC for 1 min
Number of Leads	4
Motor Length	40 mm
Shaft Diameter	5 mm D‑type

Torque vs Speed

Applications

• 3D printer extruder and motion axes.
• Mini CNC routers and desktop milling machines.
• Robotics and automated mechanisms.
• Camera sliders and precise positioning systems.
• Hobbyist and educational motion-control platforms.

Package Contents

• 1x NEMA 17 Stepper Motor 42BYGH40.
• 1x 50cm 4-wires connection cable.