SJ-2B6611TK (Mitsubishi Electric)

SJ-2B6611TK is a Mitsubishi Electric SJ-B series built-in AC spindle motor, used in medium-duty CNC machining centers. It belongs to the SJ-2B built-in spindle family, designed for higher torque compared to the 4500-series motors while still maintaining compact integrated spindle construction.

🔧 Verified specifications (official Mitsubishi data)

From Mitsubishi SJ-B series technical documentation:

Parameter	Value
Continuous rated output	7.5 kW
Short-time rated output	11 kW (30 min rating)
Acceleration/deceleration output	11 kW (standard), 13.2 kW (actual)
Base speed (low / high coil)	500 rpm / 1030 rpm
Maximum speed	1500 rpm / 6000 rpm
Continuous torque	143 N·m / 69.5 N·m
Short-time torque	210 N·m / 102 N·m
Rotor inertia	0.102 kg·m²
Frame size	160–175 class
Mass	Stator ~37 kg, Rotor ~19 kg
Cooling	Liquid / oil jacket cooling
Drive unit	MDS-D2-SP-200

🔧 Model code breakdown

Code part	Meaning
SJ	Mitsubishi spindle motor family
2B	SJ-B compact built-in spindle series
6611	7.5 kW class, high-torque configuration
TK	terminal / connector configuration type

So:

SJ-2B6611TK = 7.5 kW high-torque built-in spindle motor for medium-duty CNC machining

⚙️ What makes SJ-2B6611TK different

Compared with other SJ-2B motors:

Higher torque than SJ-2B4501TK
Lower speed but stronger cutting force
Designed for heavier machining loads

Model	Character
4501TK	balanced general machining
6611TK	high torque / heavy cutting
4502TK	higher-speed variant with different coil setup

So 6611TK is the “torque-focused” option in this family.

🏭 Typical applications

SJ-2B6611TK is commonly used in:

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

It is selected when machines need:

⚖️ strong low-speed torque
🧱 rigid spindle performance
🎯 stable heavy cutting
🔧 durability under load

⚖️ Position in Mitsubishi spindle lineup

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

🧠 Simple explanation

SJ-2B6611TK is a 7.5 kW built-in CNC spindle motor designed for heavy-duty cutting, offering high torque at low speeds and stable performance for industrial machining applications.

Mitsubishi M80 Built-IN Spindle Motor SJ-2B6611TK

Description