42BYGHW609 NEMA 17 Stepper Motor – 1.8°, 1.7A, 4000 g·cm, 40 mm Body, 5 mm Shaft

The 42BYGHW609 is a NEMA 17 hybrid stepper motor widely used in 3D printers, CNC routers, laser engravers, and desktop robotics. It has a 42 × 42 mm frame with a 40 mm body length, a 5 mm output shaft, and a 1.8° step angle, giving 200 full steps per revolution. Each phase is rated at 1.7 A, with a phase resistance of 2.0 Ω and a phase inductance of 3.0 mH, and the motor provides a holding torque of 4000 g·cm (approximately 0.4 N·m). The four-wire bipolar configuration is driven by standard A4988, DRV8825, or TMC-series stepper drivers. Its detent torque is 0.22 kg·cm and rotor inertia is 54 g·cm², so motion is smooth and repeatable at the moderate speeds used in filament extrusion and XY carriage movement. Because the motor is a hybrid design, it holds position firmly when energised and delivers consistent torque across its speed range. This 42BYGHW609 stepper motor is a practical choice for builders who need a reliable, widely supported NEMA 17 motor for precision motion projects.

1. Extruder and axis drives on FDM 3D printers.
2. X, Y, and Z motion on small CNC routers and engravers.
3. Laser engraving and cutting machine carriages.
4. Desktop robotics and mechatronics projects.
5. Automated positioning stages and linear actuators.
6. DIY and educational motion-control builds requiring a standard NEMA 17 motor.

1. Model: 42BYGHW609.
2. Motor type: hybrid stepper motor, bipolar, 4-wire.
3. Frame size: NEMA 17 (42 × 42 mm).
4. Body length: 40 mm.
5. Step angle: 1.8° (200 steps per revolution).
6. Rated current: 1.7 A per phase.
7. Rated voltage: 3.4 V (per datasheet listings; some distributors list 2.5–3.4 V).
8. Phase resistance: 2.0 Ω per phase.
9. Phase inductance: 3.0 mH per phase.
10. Holding torque: 4000 g·cm (0.4 N·m; some listings state 4.2 kg·cm).
11. Detent torque: 0.22 kg·cm.
12. Rotor inertia: 54 g·cm².
13. Shaft diameter: 5 mm.
14. Number of leads: 4.
15. Weight: approximately 0.35 kg (typical for a 40 mm NEMA 17 motor).