Product Description

The NEMA17 (42BYGH) stepper motor, labeled YK42BYGH28-0404A14, comes in the 4-wire bipolar variant. It is factory-fitted with a GT2 16-tooth pulley, ideal for belt drives in 3D printers and desktop CNC machines, delivering smooth and precise motion at moderate speeds. The NEMA17 format (42 × 42 mm faceplate) makes it easy to mount on standard frames and brackets, while the 5 mm shaft ensures compatibility with most accessories on the market.

Note: Conductor colors may vary between batches; identify the coil pairs with an ohmmeter before wiring to avoid phase reversal.

Technical Details

• Series/format: 42BYGH / NEMA17 (42 × 42 mm)
• Label model: YK42BYGH28-0404A14 (short body, "28")
• Type: hybrid stepper motor, 4 wires (bipolar)
• Step angle: 1.8°/step (200 steps/rev); microstepping compatible
• Shaft: Ø 5 mm
• Pulley: GT2 16 teeth, pre-mounted on the shaft (ideal for 3D printers and desktop CNC machines)
• Mounting: 4 × M3 in the corners, ~31 mm bolt circle (NEMA17 standard)
• Connector: 4-pin JST plug with multicolor cable
• Applications: 3D printers (X/Y/Z axes, geared extruders), light-duty CNC, linear slides, robotics, DIY automation

Package Contents

• NEMA17 stepper motor, 4 wires (bipolar) – YK42BYGH28-0404A14
• GT2 16-tooth pulley mounted on the shaft
• Short cable with a 4-pin plug attached