SJ-2B6711TK (Mitsubishi Electric)

SJ-2B6711TK is a Mitsubishi Electric SJ-B series built-in AC spindle motor, used in medium-to-heavy duty CNC machining centers. It belongs to the SJ-2B 6700-series, designed for high torque, rigid spindle performance, and stable heavy cutting applications.

🔧 Verified specifications (official Mitsubishi data)

From Mitsubishi SJ-B series specification manual:

Parameter	Value
Continuous rated output	11 kW
Short-time rated output	15 kW (30 min rating)
Acceleration/deceleration output	22 kW (standard)
Actual accel/decel output	26.4 kW
Base speed	400 rpm / 920 rpm (coil dependent)
Maximum speed	1700 rpm / 5000 rpm
Continuous torque	263 N·m / 114 N·m
Short-time torque	286 N·m / 156 N·m
Rotor inertia	0.280 kg·m²
Frame size	180–230 mm class
Stator OD	Φ299.5 mm
Cooling	Liquid / oil jacket cooling
Drive unit	MDS-D2-SP-320

🔧 Model code breakdown

Code part	Meaning
SJ	Mitsubishi spindle motor family
2B	SJ-B built-in spindle series
6711	11 kW class, high-torque heavy-duty winding
TK	terminal / connector type

So:

SJ-2B6711TK = 11 kW heavy-torque built-in spindle motor optimized for low-speed cutting strength

⚙️ Key characteristics

This model is focused more on torque than speed:

🧱 very high low-speed torque (263 N·m continuous)
⚙️ strong stability under heavy cutting load
🎯 optimized for rough machining and boring
🔩 lower max speed compared to lighter variants

It is one of the most torque-focused models in the SJ-2B 6700 series.

🏭 Typical applications

SJ-2B6711TK is used in:

vertical machining centers (VMCs)
heavy milling machines
steel and cast iron rough cutting
boring and deep drilling operations
industrial CNC production systems

It is chosen when machines need:

⚖️ maximum torque stability at low RPM
🧱 rigid heavy-duty spindle performance
🎯 continuous rough machining capability
🔧 high mechanical load capacity

⚖️ Position in Mitsubishi spindle lineup

Series	Role
SJ-2B	compact built-in spindle motors (older generation)
SJ-BG	modern high-speed built-in spindles
SJ-DG	high-torque cutting spindles
SJ-DL	external high-speed spindle motors

🧠 Simple explanation

SJ-2B6711TK is an 11 kW built-in CNC spindle motor designed for heavy-duty machining, optimized for very high torque and stable performance during low-speed, high-load cutting operations.

Mitsubishi M80 Built-IN Spindle Motor SJ-2B6711TK

Description