NEMA 17 42 40 Stepper Motor Series, 40mm Body, 1A Bipolar D-Shaft
NEMA 17 42 40 Stepper Motor Technical Overview
The KC-42HB-40L is a NEMA 17 stepper motor based on the 42HYB hybrid stepper platform. Its 42.2 × 42.2 mm frame and 40 mm body configuration address searches for nema 17 42 40, nema 17 40mm, and nema 17 stepper motor 40mm while providing the mechanical and electrical data required for engineering evaluation. The motor uses a 2-phase bipolar winding, 1.8° step angle, 1 A rated phase current, and a 5 mm D-shaft. It is intended for positioning and controlled-motion assemblies including 3D printers, CNC machines, and laser engraving equipment.
Electrical And Performance Specifications
Electrical data for the KC-42HB-40L NEMA 17 bipolar 40mm stepper motor configuration.
| Parameter | Specification |
|---|---|
| Product Model | KC-42HB-40L |
| Related Model | KC-42HYB40 |
| Series Model | KC-42HYB |
| Product Name | NEMA 17 stepper motor |
| Motor Type | Bipolar stepper motor |
| Motor Series | 42HYB hybrid stepper motor |
| Driving Voltage | 12 V / 24 V DC |
| Rated Current Per Phase | 1 A |
| Number Of Phases | 2 phases |
| Step Angle | 1.8°/step |
| Phase Resistance | 1.7 Ω |
| Phase Inductance | 3.5 mH |
| Holding Torque | 3.4 kg·cm |
| Number Of Leads | 4 leads |
| Phase A Positive | Black lead |
| Phase A Negative | Green lead |
| Phase B Positive | Red lead |
| Phase B Negative | Blue lead |
Mechanical And Customization Specifications
Dimensional information covers the standard 40 mm configuration and selectable 42HYB series shaft and body options.
| Parameter | Specification |
|---|---|
| Frame Size | 42.2 × 42.2 mm |
| Body Length | 40 mm |
| Shaft Type | D-shaft |
| Shaft Diameter | 5 mm |
| D-Shaft Flat Width | 4.5 mm |
| Shaft Length | 20 mm |
| Mounting Hole Spacing | 31 ± 0.1 mm |
| Mounting Holes | 4 × M3 |
| Mounting Thread Depth | 4.0 mm minimum |
| Front Pilot Diameter | Ø22 mm |
| Rear Protrusion | 2 ± 0.2 mm |
| Motor Weight | 276 g |
| Series Body Length Options | 24 mm / 28 mm / 33 mm / 40 mm / 48 mm / 60 mm / 68 mm |
| Shaft Diameter Options | Ø5 mm / Ø6.5 mm / Ø8 mm; custom shaft diameter available on request |
| D-Shaft Width | Customizable according to application requirements |
| Output Shaft Length | Customizable according to application requirements |
| D-Shaft Length | Customizable according to application requirements |
NEMA 17 40 mm Mechanical Dimensions
Reference drawing for frame, body, mounting pattern, pilot, and D-shaft integration.
Engineering Configuration And Application Notes
A nema 17 42mm motor describes the widely used 42 mm frame class, while the KC-42HB-40L uses a measured frame dimension of 42.2 × 42.2 mm. The 40 mm body depth makes this configuration relevant when an engineer specifies a 42mm stepper motor but must also control installation depth. Its standard 5 mm D-shaft provides a defined flat surface for coupling, pulley, or hub retention, while the 31 ± 0.1 mm mounting pattern supports mechanical integration into compatible NEMA 17 mounting structures.
Electrically, this nema 17 1a configuration uses four leads and a bipolar winding arrangement. The 1.7 Ω phase resistance and 3.5 mH phase inductance are important driver-selection parameters because current regulation, supply voltage, acceleration profile, and operating speed influence practical motor performance. The listed driving voltage options are 12 V and 24 V DC, while the rated phase current remains 1 A. Driver settings should therefore be configured according to the motor winding data rather than using supply voltage alone as the current-control reference.
The specified nema 17 holding torque is 3.4 kg·cm for this model. This makes the product relevant to searches for nema 17 3.4 kg cm where static holding capability is an important selection parameter. Holding torque should not be interpreted as continuous running torque at all speeds. Available dynamic torque changes with stepping frequency, driver current regulation, acceleration, load inertia, and mechanical transmission. For CNC machines, 3D printers, and laser engraving systems, the motor should therefore be evaluated together with the complete motion system.
Performance Advantages
- 40 mm body length combines the standard 42 mm frame class with a moderate axial installation depth for space-controlled motion assemblies.
- 1.8° step angle supports repeatable incremental positioning when paired with a compatible bipolar stepper driver.
- 3.4 kg·cm holding torque provides a defined static torque reference for motor sizing and load calculations.
- 1 A rated phase current is suitable for commonly available current-regulated bipolar stepper drive systems.
- The 5 mm D-shaft provides a mechanical flat for coupling, pulley, gear, and hub retention.
- Body lengths from 24 mm to 68 mm allow the 42HYB series to address different torque, envelope, and integration requirements.
- Ø5 mm, Ø6.5 mm, and Ø8 mm shaft options support different transmission components, with additional shaft dimensions available by request.
- Four-lead bipolar wiring provides a direct A+, A−, B+, and B− phase arrangement for integration with compatible stepper controllers.
Application Compatibility
3D Printer Motion
Suitable for evaluating X-axis, Y-axis, Z-axis, feeder, and other controlled-motion assemblies where the specified torque and installation dimensions are compatible.
CNC Machine Integration
Can be considered for positioning mechanisms, lead-screw drives, indexing systems, and auxiliary axes after load, acceleration, and speed requirements are verified.
Laser Engraving Systems
Applicable to belt, pulley, or lead-screw positioning assemblies when the 42.2 mm frame, 40 mm body, and 5 mm D-shaft correspond with the machine design.