General Specification:
- Step Angle Accuracy: ±5%（full step， no load）
- Resistance Accuracy: ±10%
- Inductance Accuracy: ±20%
- Temperature Rise: 80℃ max （rated current, 2 phase on）
- Ambient Temperature: -20℃~+50℃
- Insulation Resistance: 100MΩ min，500VDC
- Dielectric Strength: 500VDC for one minute
- Shaft Radial Play: 0.02mm max（450g load）
- Shaft Axial Play: 0.08mm max（450g load）
- Max. radial force: 28N(20mm from the flange)
- Max. axial force: 10N
- Rotation: CCW
- Insulation Class: B(130℃)
Defination of Part number:
42 | HS | 21 | M | F | 3 | X |
Frame size | Square hybrid stepper motor* | Length | Step angle** | Lead wire*** | Winding Type | External code |
**: This code shows the stepper angle of the motor. M = 0.9°; D =1.8°.
***: This code shows the lead wire number of the motor, the detail code defination is: F = 4; V = 5; S = 6; E = 8.
Specifications:
| Model | Length (mm) | Step angle deg | Resistance (Ω) | Current (A) | Voltage | Holding torque (N.cm) | Lead wires/pins | Rotor inetia （g.cm²） | Weight （kg） |
|---|---|---|---|---|---|---|---|---|---|
| 42HS21MF3 | 21 | 0.9° | 21 | 1.3 | 3 | 11 | 4 | 16 | 0.13 |
| 42HS25MF25 | 25 | 0.9° | 25 | 0.48 | 12 | 20 | 4 | 18 | 0.15 |
| 42HS25MF33CL | 25 | 0.9° | 33 | 0.4 | 13.2 | 20 | 4 | 18 | 0.15 |
| 42HS28MF8 | 28 | 0.9° | 8 | 0.425 | 3.4 | 10 | 4 | 20 | 0.18 |
| 42HS34MS30 | 34 | 0.9° | 30 | 0.4 | 12 | 16 | 6 | 36 | 0.25 |
| 42HS34MS15 | 34 | 0.9° | 15 | 0.46 | 6.9 | 14 | 6 | 36 | 0.25 |
| 42HS34MF108A-12 | 34 | 0.9° | 108 | 0.15 | 16.2 | 15 | 4 | 36 | 0.25 |
| 42HS34MF201D | 34 | 0.9° | 2.1 | 1.33 | 2.793 | 21 | 4 | 36 | 0.25 |
| 42HS34MF88 | 34 | 0.9° | 88 | 0.14 | 12.32 | 20 | 4 | 36 | 0.25 |
| 42HS34MF06 | 34 | 0.9° | 6 | 0.8 | 4.8 | 20 | 4 | 36 | 0.25 |
| 42HS40MF3 | 40 | 0.9° | 3 | 1.2 | 3.6 | 21 | 4 | 56 | 0.3 |
| 42HS40MF106 | 40 | 0.9° | 1.65 | 1.68 | 2.772 | 35 | 4 | 56 | 0.3 |
| 42HS40MF02 | 40 | 0.9° | 20 | 0.6 | 12 | 36 | 4 | 56 | 0.3 |
| 42HS40MF39 | 40 | 0.9° | 39 | 0.4 | 15.6 | 40 | 4 | 56 | 0.3 |
| 42HS40MS02 | 40 | 0.9° | 2.7 | 1.2 | 3.24 | 28 | 6 | 56 | 0.3 |
| 42HS40MS705 | 40 | 0.9° | 7.5 | 0.8 | 6 | 26 | 6 | 56 | 0.3 |
| 42HS48MF03 | 48 | 0.9° | 1 | 2.4 | 2.4 | 44 | 4 | 70 | 0.38 |
| 42HS48MF02 | 48 | 0.9° | 3.4 | 1.2 | 4.08 | 30 | 4 | 70 | 0.38 |
| 42HS48MV30 | 48 | 0.9° | 30 | 0.4 | 12 | 30 | 5 | 70 | 0.38 |
| 42HS48MF25 | 48 | 0.9° | 25 | 0.5 | 12.5 | 45 | 4 | 70 | 0.38 |
| 42HS48MS81 | 48 | 0.9° | 4.6 | 1 | 4.6 | 28 | 6 | 70 | 0.38 |
| 42HS48MS30 | 48 | 0.9° | 30 | 0.4 | 12 | 30 | 6 | 70 | 0.38 |
In-Depth Applications for the NEMA 17 Hybrid Stepper Motor 0.9°
The 42HSM Series, with its native 0.9° step angle, provides double the angular resolution of standard 1.8° NEMA 17 motors, resulting in significantly smoother acceleration and deceleration. This makes it crucial for noise-sensitive and high-accuracy systems. Key application areas include:
- Optical & Scientific Equipment: Essential for laser scanning systems, high-magnification microscopy stages, and spectrographic alignment where micro-radian precision is necessary.
- Precision Dispensing: Used in syringe pumps and fluid handling systems to ensure pulsation-free, highly accurate volumetric dosing.
- High-End 3D Printers: Upgrades standard 3D printer axes to virtually eliminate subtle banding and improve surface finish by delivering finer motor steps.
Outline:
Customization:
 |  |  |  | |  |
| Shaft | Encoder | Brake | Connector | Pulley | Gearbox |
| Item | Description |
|---|---|
| Shaft Extensions | Motors can be configured with single or double-ended shafts, manufactured to your specific length. |
| Encoder Options | We offer integration with various encoders to meet specific resolution and application needs. |
| Brake Options | Motors can be equipped with an optional brake, available with or without a manual hand release. |
| Cable Harnesses | Custom cable harnesses, with or without connectors, are available upon request. |
| Pulleys & Pinion Gears | Pulleys or pinion gears can be supplied and mounted to your specifications. |
| Gearbox Integration | Most motors can be paired with various gearbox types, including planetary, worm wheel, and parallel shaft gearboxes. |
Frequently Asked Questions (FAQ)
Q: What is the main performance difference between the 0.9° and 1.8° NEMA 17 hybrid stepper motor?
A: The 0.9° (42HSM) model offers 400 full steps per revolution, double that of the 1.8° (42HSD) model. This dramatically improves micro-stepping smoothness, lowers resonance, and increases positioning precision, making it suitable for noise-sensitive, high-accuracy applications.
Q: Can I use the same driver for this 42mm hybrid stepper motor as for a 1.8° motor?
A: Yes. Stepper motor drivers are generally compatible with both 0.9° and 1.8° motors. However, to maintain the same rotational speed, the driver must send twice the number of pulses per second to the 0.9° motor.
Q: What is the highest holding torque available in the 42HSM Series?
A: The 42HSM Series offers model lengths reaching maximum holding torque up to 45 Ncm. For optimal performance, always select a motor length that exceeds your application’s required dynamic torque.
Q: Does this high-resolution motor increase noise output?
A: No. In most cases, the 0.9° step angle reduces noise and vibration, especially during low-speed operation, because the physical step size is smaller and smoother.