This size 42 NEMA 17 geared stepper motor is equipped with a MG series planetary gearbox and the gear ratio is 20:1 and the maximum backlash is 50 arc minutes. It's an ideal choice for applications that require good accuracy but low cost. Thanks to MG series' gearbox built-in shaft coupling function, you can replace the motor or gearbox easily.
Motor Specification
Part Number: 42HS40-1684S-MG20
Step Angle: 1.8deg
Bi/Unipolar: Bipolar
Holding Torque: 0.45Nm(63.7oz.in)
Rated Current/phase: 1.68A
Phase Resistance: 1.95ohms
Inductance: 4.4mH
Motor Length: 40mm
Number of Leads: 4
Lead Length: 500mm
Gearbox Specification
Gearbox Type: Planetary
Gear Ratio: 20:1
Efficiency: 85%
Backlash at No-load: 50arcmin
Gearbo Length: 51mm
Shaft Diameter: Φ8mm
Shaft Length: 21.5mm
Keyway Length: 14mm
Motor Connection
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| Motor Specification | |
| Step Angle(°) | 1.8 |
| Bipolar/Unipolar | Bipolar |
| Holding Torque(Nm) | 0.45 |
| Holding Torque(oz.in) | 63.7 |
| Rated Current(A) | 1.68 |
| Frame Size(mm) | 42x42 |
| Body Length(mm) | 40 |
| Gearbox Specification | |
| Gearbox Type | Planetary |
| Gear Ratio | 20:1 |
| Efficiency | 85% |
| Backlash at No-load | 50arcmin |
| Gearbox Length(mm) | 51.0 |
| Shaft Diameter(mm) | 8 |
| Shaft Length(mm) | 21.5 |
