• 3 phase, NEMA23 frame size
• 56 mm long
• 3.5 A phase current
• 0.8 N.m holding torque
• 6.35 mm shaft size
• Built with high quality materials.High precision, low motor heating, and low vibration。
The 57J1250-635 is a 0.8 N·m 3-Phase Stepper Motor rated at 0.8 N·m of holding torque at 3.5 A per phase, built on the NEMA23 (57 mm) frame. Its 56 mm body is among the shortest in the NEMA23 class, making it a sensible choice for light-duty positioning where mounting depth is limited.
Three-phase excitation reduces torque ripple, giving smooth, low-noise stepping appropriate for food and packaging line accessories where operators work close by. The 3.5 A winding keeps heating moderate, so torque stays stable through repeated index cycles.
The 6.35 mm shaft is sized for small couplings and pulleys. Open-loop control means no encoder wiring or tuning. The NEMA23 flange provides a simple, widely available mount.
This motor is well suited to motion control across packaging machinery, factory automation, desktop CNC setups, robotics, textile machinery, printing machinery, food processing and light-duty handling and positioning mechanisms. Compact machine builders use it where the standard NEMA23 footprint must coexist with a very short motor cavity. Laboratory-style instrumentation and inspection stages also fit, since the low-vibration stepping keeps optics and sensors stable.
With 0.8 N·m available, keep the driven load and cycle speed modest. The short stack delivers its torque best at low to medium speeds, so review the torque-speed curve at the exact operating RPM. If the axis also carries a brake or coupling, account for that added inertia when setting the drive acceleration.
Select a 3-phase drive rated for at least 3.5 A per phase. For lightweight, repetitive positioning this motor offers a compact, low-maintenance open-loop solution that is easy to wire and run. Because the shaft is 6.35 mm rather than the more common 8 mm, confirm the coupling bore before ordering. Lyenwsin stocks the motor and can recommend a compatible 3-phase drive and coupling set.
| Model | 57J1250-635 |
| Phase | 3 |
| Step Angle（deg） | 1.2 |
| Holding Torque(N·m) | 0.8 |
| Rated Current（A） | 3.5 |
| Phase Resistance(ohm) | 0.77 |
| Phase Inductance（mH） | 1.8 |
| Detent Torque（mN·m） | 350 |
| Rotor inertia（g·cm²） | 280 |
| Insulation Class | B |
| Number of Leads | 6 |
| Weight（kg） | 0.75 |
| Length（mm） | 56 |
| Matched Drive | 3DM783 |
| Frame Size（NEMA） | 23 |
| Shaft Diameter（mm） | 6.35 |
| Frame Size(mm) | 57 |
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