42BYGHW811 NEMA-17 Bipolar 48mm Stepper




$14.28 ea.

This motor is a larger NEMA-17 motor that produces a whopping 4800g-cm of holding torque.

Description [Hide]

Stepper motors are different from DC motors in that they have to be pulsed to move in set increments. That means you can't simply hook them up to a power supply to make them go, but they have other advantages, like accurate positioning (1 pulse=1 increment of movement), and lots of low-speed torque (ability to twist things). The flip side is that they are power-pigs, but ya gotta love this sort of pig!

Sourced by Phidgets, this larger 3303 NEMA-17 stepper motor produces a whopping 4800g*cm (66.7in*oz) of holding torque. To control this type of motor you'll need a circuit that has 4 or more mosfets, a Dual H-bridge, or a specifically designed Stepper driver.

If you're connecting it to a 1063 - PhidgetStepper Bipolar 1-Motor or similar controller, use this table to connect the motor wires to the board connectors to get clockwise rotation. To wire for counter-clockwise rotation, swap the Red and Blue wires. Please note: Connecting the motor directly to a power supply will destroy the motor and void the warranty. If you want to check your motor make sure it is connected to a constant current / chopper drive controller.

Board Connector A is Black
Board Connector B is Green
Board Connector C is Red
Board Connector D is Blue

Note: This is not the internal wiring of the stepper which is usually has A & C and B & D labels tied together, but to be clear the Black & Green wires are connected to one coil in the motor and Red and Blue the other. Datasheet available under documentation tab.


  • NEMA-17 Bipolar 4-wire
  • Step Angle: 1.8°
  • Step Accuracy: 5%
  • Holding Torque: 4800g-cm / 66.66 oz-in
  • Coil Resistance: 1.25 Ohms
  • Rated Current: 2.5 A
  • Motor Height: 48mm
  • Motor Length and Width: 42mm
  • Mounting Plate Size: NEMA-17
  • Shaft Diameter: 5mm
  • Shaft Length: 22mm
  • Weight: 332g
  • Number of Leads: 4

Note: Make sure to unplug the power cord from the your driving circuit before switching wires around.

Documentation [Hide]

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