Description
SJ-2B4004T (Mitsubishi Electric)
SJ-2B4004T is a Mitsubishi Electric SJ-B series built-in AC spindle motor, used in light-duty CNC machine tools and small spindle applications. It is part of the SJ-2B compact built-in spindle family, designed for simple machining tasks, auxiliary spindles, and small machining centers.
🔧 Verified specifications (official Mitsubishi data)
From Mitsubishi SJ-B series documentation:
| Parameter | Value |
|---|---|
| Series | SJ-B |
| Model | SJ-2B4004T |
| Continuous rated output | 0.75 kW |
| Short-time rated output | 1.5 kW (15 min rating) |
| Acceleration/deceleration output | 1.5 kW |
| Actual accel/decel output | 1.8 kW |
| Base rotation speed | 3000 rpm |
| Maximum speed | 15,000 rpm |
| Rated torque (continuous) | ~2.39 N·m |
| Short-time torque | ~4.77 N·m |
| Rotor inertia | 0.00078 kg·m² |
| Frame class | small built-in spindle (SJ-B compact series) |
🔧 Model code breakdown
| Code part | Meaning |
|---|---|
| SJ | Mitsubishi spindle motor family |
| 2B | SJ-B compact built-in spindle series |
| 4004 | 0.75 kW class motor variant |
| T | terminal / connector configuration type |
So:
SJ-2B4004T = 0.75 kW compact built-in spindle motor for light CNC machining
⚙️ What this motor is used for
SJ-2B4004T is typically used in:
- small CNC machining centers
- light milling and drilling spindles
- auxiliary spindle units
- precision low-load machining
- compact high-speed tooling applications
⚖️ Position in Mitsubishi spindle lineup
| Series | Role |
|---|---|
| SJ-2B | compact low-power built-in spindles |
| SJ-BG | modern high-speed integrated spindles |
| SJ-DG | high-torque cutting spindles |
| SJ-DL | high-speed external spindle motors |
🧠 Simple explanation
SJ-2B4004T is a small 0.75 kW built-in spindle motor designed for light CNC machining, offering moderate speed and low cutting power for compact machine tool applications.