JK42HS48-1684-03F NEMA17 5.5 kg-cm Stepper Motor – D-Type Shaft
JK42HS48-1684-03F NEMA17 5.5 kg-cm Stepper Motor – D-Type Shaft
JK42HS48-1684-03F NEMA17 5.5 kg-cm Stepper Motor – D-Type Shaft
The JK42HS48-1684-03F is a precision NEMA17 stepper motor engineered for applications requiring controlled rotational positioning with 5.5 kg-cm holding torque and a D-type shaft configuration for secure mechanical coupling. This motor is widely used by robotics engineers, automation technicians, and CNC machine builders who demand reliable step-and-direction control for 3D printers, laser cutters, and industrial positioning systems. It solves the critical challenge of achieving accurate angular displacement without feedback sensors while maintaining consistent torque across variable load conditions.
Product Overview
The JK42HS48-1684-03F operates on the electromagnetic principle of stacked rotor poles and energized stator coils, delivering precise 1.8-degree step angles per pulse in full-step mode. When sequential current pulses are applied through the motor windings via a stepper driver, the magnetic field rotates in discrete steps, forcing the rotor to lock onto each successive pole position. This open-loop control architecture eliminates the need for expensive encoders or feedback mechanisms, making it ideal for cost-sensitive automation projects. The D-type shaft design provides a flat contact surface that prevents rotational slipping when coupled to gears, pulleys, or lead screws through a simple set-screw mechanism.
The 5.5 kg-cm holding torque specification indicates the motor can maintain position against external loads up to 0.54 Newton-meters without losing step synchronization, provided the driver supplies adequate current and the mechanical load remains within rated specifications. The NEMA17 frame size (42mm x 42mm) offers a compact footprint suitable for space-constrained applications while delivering sufficient power for light to medium-duty positioning tasks. This particular model variant features optimized winding resistance and inductance characteristics that balance acceleration capability with heat dissipation, allowing sustained operation at moderate speeds without thermal shutdown.
Key Specifications
| Specification | Details |
| Product Type | NEMA17 Bipolar Stepper Motor |
| Model Number | JK42HS48-1684-03F |
| Holding Torque | 5.5 kg-cm (0.54 Nm) |
| Shaft Type | D-Type Shaft with Flat |
| Step Angle | 1.8 degrees per step |
| Frame Size | NEMA17 (42mm x 42mm) |
| Rated Voltage | 12V DC typical |
| Phase Configuration | Bipolar 2-Phase |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
Key Features
- D-Type Shaft Design: Flat contact surface prevents rotational slip when coupled to mechanical components, ensuring reliable power transmission without backlash in positioning applications
- 5.5 kg-cm Holding Torque: Sufficient force to maintain position against moderate external loads and maintain step fidelity during dynamic acceleration phases
- 1.8-Degree Step Resolution: 200 steps per revolution in full-step mode enables smooth motion profiles and precise positioning for robotic arms and automated machinery
- Compact NEMA17 Form Factor: 42mm frame fits into space-constrained enclosures while delivering adequate power for 3D printing, laser engraving, and light industrial automation
- Bipolar Configuration: Two-phase design allows smooth torque delivery with microstepping capability when paired with advanced PWM drivers for enhanced resolution
- Standard Mounting Pattern: NEMA17 mounting holes enable direct integration with industry-standard brackets, couplings, and mechanical assemblies
Applications and Use Cases
- 3D Printer Axis Motors: Drives X, Y, and Z-axis motion with precise layer-by-layer positioning, where the D-shaft couples directly to lead screws for vertical movement and belt-driven pulleys for horizontal travel
- CNC Laser Engraver Control: Powers galvanometer mirror positioning and material feed systems, requiring repeatable step accuracy to maintain registration across multiple cutting passes
- Automated Packaging Equipment: Controls conveyor speed, label application timing, and product ejection mechanisms in production lines where synchronized multi-axis motion is critical
- Robotics and Articulated Arms: Actuates joint rotation in collaborative robots and pick-and-place systems where holding torque prevents gravity-induced drift between motion commands
- Medical Diagnostic Equipment: Drives sample carousel rotation and optical component positioning in laboratory analyzers requiring contamination-free operation and reliable step-locking
- Surveillance Pan-Tilt Systems: Powers camera gimbal rotation with smooth acceleration profiles and precise angular positioning for security monitoring applications
How to Use
To integrate the JK42HS48-1684-03F into your project, first identify the four motor leads and determine their phase pairing using a multimeter or manufacturer documentation. Connect the motor to a stepper driver module such as the A4988, DRV8825, or TB6600, ensuring that coil pairs are wired to the correct driver outputs to prevent loss of synchronization. The D-type shaft should be coupled to your mechanical load using a flexible coupling or rigid coupler with an internal D-bore that matches the shaft diameter, typically secured with a set-screw tightened perpendicular to the flat surface to prevent slippage under load.
Configure your microcontroller or motion control board to generate step and direction pulses at appropriate frequencies based on your desired speed profile. Start with conservative pulse rates of 500 to 1000 Hz and gradually increase frequency while monitoring for missed steps or audible cogging, which indicates the load exceeds motor torque capability at that speed. Always apply current through the driver before mechanical load is applied, and implement software acceleration ramps to prevent sudden torque spikes that could cause step loss. For optimal performance in continuous-duty applications, ensure adequate ventilation around the motor to prevent thermal buildup, and verify that your driver current setting matches the motor's rated winding current to avoid overheating or insufficient holding force.
Frequently Asked Questions
What is the maximum speed this stepper motor can achieve?
The JK42HS48-1684-03F can operate at speeds up to 3000 RPM in full-step mode when driven by a quality stepper driver with adequate current supply. However, holding torque decreases significantly at high speeds due to back-EMF effects and inductance limitations. For reliable positioning with maintained torque, operation is typically limited to 1000-1500 RPM depending on load inertia and acceleration requirements. Microstepping at higher frequencies can improve smoothness but reduces available torque by 30-40 percent.
Can this motor be used with microstepping drivers?
Yes, the JK42HS48-1684-03F is fully compatible with microstepping drivers that subdivide the full 1.8-degree step into smaller increments such as 1/2, 1/4, 1/8, or 1/16 steps. Microstepping provides smoother motion, reduced vibration, and better positioning accuracy for applications like 3D printing and laser engraving. However, microstepping reduces the effective holding torque by the microstepping ratio, so a 1/16 microstepping driver delivers only 6 percent of the rated holding torque at each microstep position. Always verify that your application load remains within the reduced torque envelope when using microstepping.
What is the difference between holding torque and running torque?
Holding torque (5.5 kg-cm for this model) is the maximum external force the motor can resist when stationary with current applied, preventing the rotor from rotating. Running torque, also called dynamic torque, is significantly lower and decreases further as speed increases due to back-EMF and inductance effects. At 1000 RPM, running torque typically drops to 30-50 percent of holding torque. This distinction is critical when selecting motors for applications where the load must be held stationary between motion commands versus applications requiring continuous smooth acceleration under load.
How do I prevent step loss in my application?
Step loss occurs when the motor cannot accelerate the load fast enough to keep pace with the step pulses, causing the rotor to slip and lose synchronization. Prevent this by reducing acceleration rates, decreasing load inertia through mechanical design optimization, increasing driver current supply (if within motor ratings), using a larger motor with higher torque, or reducing the speed at which acceleration occurs. Always implement software acceleration ramps that gradually increase pulse frequency rather than jumping to maximum speed instantly. Test your system under worst-case load conditions and verify step accuracy using encoder feedback or visual position confirmation.
Is the D-type shaft compatible with standard stepper motor couplings?
The D-type shaft is compatible with couplings and pulleys specifically designed for D-bore shafts, which feature a flat contact surface matching the motor shaft flat. Standard round-bore couplings will not work without a custom adapter. When selecting mechanical components, verify the bore diameter matches your motor shaft diameter (typically 5mm for NEMA17) and confirm the coupling includes a set-screw or clamping mechanism that can grip the flat surface securely. Flexible couplings are preferred over rigid couplings to accommodate minor misalignment and reduce vibration transmission.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
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