The 42H48612N is a high-torque Nema 17 stepper motor featuring standard faceplate dimensions of 42.3mm x 42.3mm. Utilizing an extended motor body length (Approx 48mm), it physical maximizes the internal rotor and stator layout to deliver a robust holding torque of 0.55Nm. Drawing a highly efficient 1.5A per phase, this motor provides excellent holding force and mechanical stability, making it an ideal drive component for desktop CNC projects, heavy-duty 3D printers, and precision automated instrumentation.

Specifications

• Model Number: 42H48612N
• Frame Size: Nema 17 (42.3mm x 42.3mm)
• Holding Torque: 0.55Nm (Approx 78 oz-in or 5.6kg-cm)
• Rated Current: 1.5A per phase
• Configuration: 4-Wire Bipolar
• Step Angle: 1.8℃ (200 steps per full revolution)
• Motor Body Length: Approx 48mm (Extended profile)
• Shaft Type: D-Cut (Flat edge to prevent pulley/gear slipping)
• Shaft Diameter: Standard 5mm
• Phase Resistance: Optimized low resistance for efficient thermal handling

Core Features

• High Torque-to-Current Efficiency: Providing a powerful 0.55Nm of torque at only 1.5A means the motor runs remarkably efficiently. It prevents skipped steps under heavy structural loads without forcing your stepper drivers to run at their absolute thermal limits.
• D-Shape Output Shaft: Machine-cut with a flat indentation running down the 5mm drive shaft. This ensures that grab screws on GT2 timing pulleys, driving gears, or rigid leadscrew couplers lock down with maximum mechanical grip, eliminating positional backlash.
• Excellent Driver Matching: Fully compatible with common plug-in stepper drivers such as the A4988, DRV8825, and silent TMC modules (TMC2208/TMC2209), making it a painless, drop-in hardware upgrade.
• Industrial Thermal Resilience: Built using heavy-duty casing laminations and high-temperature coil insulation, allowing the motor to handle continuous duty cycles without structural degradation.

Common Applications

• 3D Printer Motion Control: Powering heavy Y-axis heated beds or driving rapid X-axis toolhead carriages on large Cartesian, CoreXY, or Delta printers.
• Desktop CNC Routers: Operating the linear travel stages on hobby milling machines (like the 3018 CNC series) cutting wood, plastics, and engraving soft metals.
• Precision Extruder Systems: Running gear-reduced direct-drive extruders (like the BMG or Titan setups) that require constant, rigid torque to push filament uniformly.
• Automated Lab Equipment: Operating linear stages, rotary tables, and precision fluid-pumping apparatuses.

Usage & Tuning Tips

• VREF Calibration is Critical: Check the current limit potentiometer (VREF) on your stepper driver and calibrate it precisely so that the output current matches or sits slightly below the 1.5A rating. Running too much current will trigger rapid motor overheating, while too little current will cause low torque and missed steps.
• Never Disconnect While Powered: Never unplug the 4-wire motor connector from your control board while the power supply is actively turned on. Disconnecting a stepper motor under load induces a massive high-voltage back-EMF spike that will instantly destroy the stepper driver's transistors.
• Thermal Management Expectation: Stepper motors convert excess current into heat; it is completely normal for the aluminum body of this motor to reach temperatures up to 50℃ - 65℃ during intensive operation. However, if the motor body exceeds 80℃ (too hot to touch for even a split second), consider lower your driver's operating current slightly or adding a passive aluminum heatsink to protect the lifespan of the internal magnetic core.