PB42HS34-0404 NEMA17 Stepper Motor With 300MM Cable, Round Shaft 1.8 degree

Specifications:

• Motor Type: Bipolar Hybrid Stepper

• Frame Size: NEMA 17 (42mm × 42mm)

• Motor Length: 34mm

• Step Angle: 1.8° (200 steps per revolution)

• Rated Current: 0.4A per phase

• Holding Torque: 1.4 kg-cm (1400 g-cm / 0.14 Nm)

• Shaft Type: Round

• Shaft Diameter: 5mm

• Cable Length: 300mm

• Wiring Configuration: 4-Wire

• Weight: 0.22 kg (220g)

???? Project Evolution

• Past Projects: If you've previously built projects using small DC gear motors or low-end 28BYJ-48 stepper motors, you likely experienced frustrating limitations. They struggle under load, skip steps during fast movements, and lack the torque needed to move anything heavier than a small sensor array.
• The Upgrade Unlock: Integrating the PB42HS34-0404 NEMA 17 changes what you can build. With a substantial 1.4kg-cm of holding torque, this motor can actively hold a load in place without slipping. The 1.8° step angle (200 steps per revolution) allows for micro-metric precision, making it the standard choice for custom 3D printer extruders, lightweight CNC axes, and precise robotic joints.
• Effort Level & Minimum Hardware: ???? Intermediate: Getting this motor spinning requires a basic understanding of motor drivers and power management. You cannot power this directly from an Arduino or Raspberry Pi. You will need a dedicated stepper motor driver (like the A4988 or DRV8825) and an external 12V or 24V power supply capable of delivering sufficient current.

????‍???? Virtual Technician & Wiring Guide

Wiring a bipolar stepper motor correctly is critical; mixing up the coil pairs can damage your driver. The PB42HS34-0404 uses a standard 4-wire configuration, representing two separate internal coils (Coil A and Coil B).

⚠️ CRITICAL WARNING: Never connect or disconnect the stepper motor from the driver board while the power is on. Doing so will instantly destroy the stepper driver chip due to high voltage spikes.

Required Additional Items:

• Stepper Motor Driver (A4988, DRV8825, or TMC2208) — required to translate logic signals from your microcontroller into the high-current power the motor needs.

• Microcontroller (Arduino Uno, Mega, ESP32) — to generate the STEP and DIR control signals.

• External Power Supply (12V or 24V DC, minimum 2A) — to provide the necessary voltage and current to drive the motor coils.

Recommended Add-ons:

• NEMA 17 Mounting Bracket (L-Bracket) — for rigid, secure mounting to your chassis or extrusion.

• 5mm Shaft Coupler (Flexible or Rigid) — to connect the motor's round shaft to your lead screw or drive rod.

• NEMA 17 Dampers — to significantly reduce vibration and operating noise in 3D printers and sensitive builds.

Package Includes:

• 1× PB42HS34-0404 NEMA 17 Stepper Motor

• 1× 300mm 4-wire connecting cable (pre-attached/connectorized)

Frequently Asked Questions

Q1: Is the PB42HS34-0404 NEMA 17 compatible with Arduino Uno? Yes, it is fully compatible with an Arduino Uno, but it cannot be connected directly to the board. You must use a dedicated stepper motor driver (like the A4988) between the Arduino and the motor.

Q2: Can I use this stepper motor with a Raspberry Pi? Yes, the PB42HS34-0404 works perfectly with a Raspberry Pi. Since the Pi outputs 3.3V logic, simply ensure your chosen stepper motor driver supports 3.3V logic signals on its STEP and DIR pins.

Q3: Does the PB42HS34-0404 work with an L298N motor driver? While technically possible, using an L298N is highly discouraged for this stepper motor. You should use a current-limiting stepper driver like the A4988 or DRV8825 to maintain optimal torque and prevent overheating.

Q4: Can I use this NEMA 17 motor for a 3D printer extruder? Absolutely, the PB42HS34-0404 is an excellent choice for lightweight 3D printer extruders. Its 1.4kg-cm holding torque and 0.22kg weight make it ideal for direct drive or Bowden setups without weighing down the gantry.

Q5: What voltage does the PB42HS34-0404 NEMA 17 require? While the internal coils have a low nominal voltage rating, this motor is designed to be driven by a constant-current stepper driver powered by a 12V to 24V DC power supply. Higher voltages allow the driver to push current into the coils faster, resulting in better high-speed performance.

Q6: How much current does this stepper motor draw? The PB42HS34-0404 is rated for 0.4A per phase. You must adjust the VREF potentiometer on your stepper motor driver to match this 0.4A limit to prevent damaging the motor.

Q7: Can I power the PB42HS34-0404 from my Arduino's 5V or Vin pin? No, drawing stepper motor power from an Arduino will instantly overload the board's voltage regulator and destroy the Arduino. Always use a separate external power supply (e.g., 12V 2A) wired directly to your motor driver.

Q8: How do I connect the PB42HS34-0404 to an A4988 driver? Wire the two internal motor coils to the driver's output pins. Connect Coil A to pins 1A and 1B, and Coil B to pins 2A and 2B on the A4988 driver board.

Q9: How do I find the coil pairs on this 4-wire NEMA 17 motor? Use a digital multimeter set to continuity mode and probe the four wire ends. The two wires that cause the multimeter to beep form a single continuous coil pair.

Q10: Do I need a capacitor for the PB42HS34-0404 wiring? Yes, it is strictly required to place a 100µF (minimum 35V) electrolytic capacitor across the VMOT and GND pins on your stepper driver. This protects the driver from destructive voltage spikes generated by the motor.

Q11: Which Arduino library should I use for the PB42HS34-0404? The "AccelStepper" library is highly recommended for controlling this motor. It handles the complex math required for smooth acceleration and deceleration, preventing the motor from stalling during rapid movements.

Q12: Is there a MicroPython library to run this NEMA 17 on a Pico? Because standard stepper drivers only require simple high/low pulses on the STEP and DIR pins, you do not strictly need a complex library in MicroPython. However, searching for "MicroPython stepper motor driver" on GitHub will yield several community-made classes to simplify the code.

Q13: Where can I find example code for this NEMA 17 motor with Arduino? The easiest way is to install the AccelStepper library via the Arduino Library Manager, then open File > Examples > AccelStepper to find ready-to-run code for step/dir drivers.

Q14: Why is my PB42HS34-0404 just vibrating and not turning? Vibration without rotation almost always means one of the motor coils is wired incorrectly. Check your wiring with a multimeter to ensure you haven't mixed up a wire from Coil A with a wire from Coil B.

Q15: Why is the NEMA 17 motor getting extremely hot? Stepper motors naturally run warm, but if it is too hot to touch, your driver is supplying too much current. Use a multimeter and a ceramic screwdriver to lower the VREF adjustment on your stepper driver to match the motor's 0.4A rating.

Q16: Why is my stepper motor skipping steps during movement? Skipping steps usually occurs if you are accelerating the motor too quickly, attempting to move a load that exceeds its 1.4kg-cm torque, or using a power supply voltage that is too low to maintain torque at higher speeds.

Q17: My stepper driver blew up when using this motor — what happened? You likely unplugged or plugged in the PB42HS34-0404 motor wires while the power supply was turned on. Connecting or disconnecting a stepper motor while powered instantly fries the driver chip.

Q18: Does Probots sell the PB42HS34-0404 NEMA 17 in bulk for institutional orders? Yes, we supply these stepper motors in bulk for manufacturing lines, 3D printer builders, and engineering colleges. Please contact our sales team for volume pricing and lead times.

Q19: Is the PB42HS34-0404 on Probots the genuine version or a clone? Every stepper motor we stock is Probots™ ProSpec Grade. We strictly source and visually verify these motors to ensure they meet the genuine datasheet specifications for torque, step angle, and internal build quality.

Q20: Does Probots provide technical support for this motor after purchase? Yes, our Bangalore-based engineering team is available to assist you. If you are struggling with driver wiring, calculating VREF, or debugging your code, we can help you get your project moving.