• 3 phase, NEMA34 frame size
• 126 mm long
• 5.0 A phase current
• 7.8 N.m holding torque
• 14 mm shaft size
• Built with high quality materials.High precision, low motor heating, and low vibration。
The 86J12126-650 is a 7.8 N·m 3-Phase Stepper Motor 5.0A, built on the NEMA34 (86 mm) frame with a 126 mm body and 14 mm shaft. The higher per-phase current rating suits systems where the drive has headroom and where rapid, high-torque response is preferred during start-stop and indexing motion.
The 5.0 A winding is designed to hold rated torque with controlled internal heating, which preserves repeatability over sustained duty. Three-phase excitation smooths torque steps, reducing vibration and noise during indexing and continuous rotation. This helps equipment that must produce repeatable motion without audible roughness or frame resonance.
The 14 mm shaft mates with standard couplings and pulleys. Open-loop control removes encoder wiring and feedback tuning from the commissioning list. The NEMA34 frame is a common industrial size, so mounting, coupling and drive selection follow familiar patterns in most machine shops.
The high-current winding suits compact CNC equipment, factory automation, packaging machinery, robotic mechanisms, textile machinery, printing machinery and food processing. Systems that drive heavy tooling, fast indexing or frequent reversals benefit from the torque reserve delivered by a driver set to the full 5.0 A rating.
Use a 3-phase stepper drive rated for at least 5.0 A output per phase. Confirm the supply bus voltage supports the target speed under load, and size the axis on the torque-speed curve rather than the holding torque alone. If the application runs at high duty cycle, provide adequate airflow around the motor so the winding stays within its thermal limit. Lyenwsin offers matching 3-phase drives and application support to simplify the selection.
| Model | 86J12126-650 |
| Phase | 3 |
| Step Angle（deg） | 1.2 |
| Holding Torque(N·m) | 6.78 |
| Rated Current（A） | 5 |
| Phase Resistance(ohm) | 1.8 |
| Phase Inductance（mH） | 8 |
| Detent Torque（mN·m） | 3000 |
| Rotor inertia（g·cm²） | 3500 |
| Insulation Class | B |
| Number of Leads | 6 |
| Weight（kg） | 4 |
| Length（mm） | 126 |
| Matched Drive | 3DM3422 |
| Frame Size（NEMA） | 34 |
| Shaft Diameter（mm） | 14 |
| Frame Size(mm) | 86 |
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