SJ-2B6602TK (Mitsubishi Electric)

SJ-2B6602TK 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 6600-series, which is designed for higher torque and higher load capacity compared to the 4500-series motors.

🔧 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	15 kW (low-speed coil) / 22 kW (high-speed coil)
Actual accel/decel output	18 kW / 26.4 kW
Base speed	550 rpm (low-speed coil) / 1193 rpm (high-speed coil)
Maximum speed	2000 rpm / 8000 rpm
Continuous torque	191 N·m / 88 N·m
Short-time torque	260 N·m / 120 N·m
Rotor inertia	0.133 kg·m²
Frame size	160–230 mm class
Stator OD	Φ254.5 mm
Cooling	Liquid/oil jacket cooling
Mass	Stator ~49 kg / Rotor ~25 kg

🔧 Model code breakdown

Code part	Meaning
SJ	Mitsubishi spindle motor family
2B	SJ-B compact built-in spindle series
6602	11 kW class, higher torque winding configuration
TK	terminal / connector type

So:

SJ-2B6602TK = 11 kW built-in spindle motor optimized for high-torque machining

⚙️ What makes SJ-2B6602TK important

Compared to smaller SJ-2B models:

Much higher torque (up to 260 N·m short-time)
Better suited for heavy cutting / roughing
Strong low-speed performance
Designed for larger machining centers

It is part of the “heavy-duty SJ-2B” group, not the light compact spindles.

🏭 Typical applications

SJ-2B6602TK is used in:

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

It is selected when machines need:

🧱 high cutting force
⚖️ stable torque at low speed
🎯 rigid spindle performance
🔧 continuous industrial duty

⚖️ Position in Mitsubishi spindle lineup

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

🧠 Simple explanation

SJ-2B6602TK is an 11 kW built-in CNC spindle motor designed for heavy-duty machining, offering high torque and strong cutting capability for industrial CNC applications.

Mitsubishi M80 Built-IN Spindle Motor SJ-2B6602TK

Description