Square ER25 4KW 4 Ceramic Bearings 220V Air Cooled Spindle Motor for CNC Router Engraving Machine

 VIDEO OF 4KW CNC SQUARE AIR COOLED SPINDLE MOTOR

 4KW SQUARE AIR COOLED SPINDLE MOTOR FOR SALE

Zhong Hua Jiang 4KW square air cooled spindle motor is designed for CNC router machines, engraving machines, milling machines, woodworking CNC equipment, and professional cutting applications. With ER25 collet, 220V/380V voltage options, 300Hz working frequency, 10000-18000 RPM speed range, and air cooling structure, it provides strong cutting power and stable machining performance for B2B buyers, machine builders, workshops, and distributors.

This square CNC spindle motor is suitable for wood, acrylic, MDF, plastics, PVC, PCB boards, plexiglass, aluminum, brass, and other soft metals. The square body design supports easier mounting, while the pre-soldered aviation wire and included wrenches help reduce installation time.

 TECHNICAL SPECIFICATIONS

 APPLICATIONS & USE CASES

Wood

Acrylic

Soft Metals

 FEATURES OF CNC AIR COOLED SPINDLE MOTOR

Zhong Hua Jiang ER25 4KW square air cooled spindle motor is engineered for CNC engraving, milling, routing, and cutting projects that require power, precision, and long service life. It is a practical upgrade for professional CNC workshops, machine builders, small factories, and B2B procurement teams looking for stable spindle performance.

High-Precision ER25 Collet System

The ER25 collet provides secure tool clamping for larger cutters, helping reduce vibration and improve machining accuracy during heavy-duty CNC routing and engraving.

Accurate Speed Regulation

The spindle supports 10000-18000 RPM and should be used with a 300Hz VFD for speed control. This helps operators adjust spindle speed according to material type, tool diameter, and machining requirements.

Optimized Air Cooling Design

The air cooled structure dissipates heat without an external water pump, water pipe, or coolant tank. This makes installation simpler and maintenance easier for CNC router users.

Reliable Electrical Components

The spindle supports 220V/380V operation and 10A current, making it suitable for professional CNC router systems requiring continuous and stable output.

 ADVANTAGES OF AIR COOLED SPINDLE MOTOR

Advanced Dynamic Balance Design

Innovative dynamic balancing technology helps reduce noise, lower vibration, and increase machining stability during continuous CNC operation.

Extended Working Life

The motor uses 4 upgraded bearings, durable steel bearing components, and an all-copper lengthened rotor coil. Under normal working conditions, the service life can reach 2 years at 8 hours per day.

Our Spindle Motor	Other Spindle Motor
Runout of less than 0.005mm	Runout of 0.05mm

High Accuracy & Concentricity

Further processing and precision control help the spindle achieve runout of less than 0.005mm, supporting more stable engraving, milling, and cutting performance.

 10 TIMES PRECISION RUNOUT 

Easy and Fast Installation

The package includes pre-soldered aviation wire for quick connection, and installation holes are designed on both sides of the square spindle body for convenient mounting.

 PACKAGE LIST OF AIR COOLED SPINDLE MOTOR

Whether you are a CNC hobbyist, machine builder, or professional workshop, Zhong Hua Jiang can provide suitable air cooled spindle motor solutions. If the standard configuration does not match your machine, please contact our sales team for customized spindle motor recommendations.

 RECOMMEND AIR COOLED SPINDLE MOTOR

Besides the 4KW ER25 square air cooled spindle motor, Zhong Hua Jiang offers 0.8KW, 1.5KW, 2.2KW, 3KW, 5KW, 6KW, and 7.5KW air cooled spindle motors, as well as water cooled spindle motors and spindle motor kits for different CNC router applications.

ER11 0.8KW Air Cooled Spindle Motor

ER11 1.5KW Air Cooled Spindle Motor

ER20 2.2KW Air Cooled Spindle Motor

ER20 3KW Air Cooled Spindle Motor

ER11 1.5KW Square Air Cooled Spindle Motor

ER20 2.2KW Square Air Cooled Spindle Motor

ER20 3KW Square Air Cooled Spindle Motor

ER32 5KW Air Cooled Spindle Motor

ER32 6KW Air Cooled Spindle Motor

ER32 7.5KW Air Cooled Spindle Motor

Round Air Cooled Spindle Motor Kits

Square Air Cooled Spindle Motor Kits

 COMPANY PROFILE

 CNC SPINDLE MOTOR MANUFACTURER 

 WHY CHOOSE US

Quality Assurance Superior quality performance Strict quality control	Patents and Certifications Several patents for air-cooled spindle motors	Additional Brand Value Brand value highly recognized by the market
Reasonable Price Direct factory sales High cost performance	Full Time Service Professional technical support Quick customer service	Fast and Reliable Delivery Fast and efficient delivery Real-time tracking and updates

 LEADING CNC MACHINE / CNC SPINDLE MOTOR MANUFACTURER SINCE 2000 

 OUR PRODUCT RANGE

CNC Router Machines

Zhong Hua Jiang CNC router machines, including 3018, 3020, 3040, and 6090 models, are designed for precision engraving, cutting, and routing projects.

CNC Spindle Motors

Our spindle motor range includes air cooled and water cooled spindle motors for wood, acrylic, plastic, aluminum, brass, and other CNC machining materials.

CNC Accessories

We also supply CNC accessories such as limit switches, Z probes, emergency stop buttons, shielded cables, stepper motors, and other CNC machine parts.

 PRODUCT CERTIFICATION

 CUSTOMER FEEDBACK

 FAQ

What materials can the 4KW air cooled CNC spindle motor work with?

It can engrave and mill wood, acrylic, MDF, plastics, PCB boards, PVC, plexiglass, and soft metals such as aluminum and brass.

What VFD should be used with this 4KW square spindle motor?

This spindle should be equipped with a 300Hz VFD. Please select the correct voltage version, 220V or 380V, according to your power supply and CNC system.

Can I purchase the 4KW air cooled CNC spindle motor in bulk or as a distributor?

Yes. Zhong Hua Jiang supports distributors, resellers, wholesalers, CNC machine builders, and global B2B buyers with factory-direct pricing, stable supply, and export support.

Do you offer OEM or customization services?

Yes. OEM and ODM options are available for logo, packaging, voltage specifications, collet type, bearing configuration, cable requirements, and spindle motor kits.

What is the minimum order quantity?

Small trial orders are accepted for standard 4KW air cooled spindle motors. For OEM or customized orders, MOQ can be discussed according to project requirements.

How long is the production and delivery time?

Standard kits usually take 3-7 working days after payment. Large or customized orders usually take 10-20 days, depending on order quantity and customization details.

What warranty do you provide for the 4KW air cooled CNC spindle motor?

Zhong Hua Jiang provides a 12-month warranty for spindle motors, power converters, and accessories. Quality-related parts can be replaced during the warranty period.

Do you provide after-sales technical support?

Yes. Technical support is available for installation, VFD parameter setup, wiring, troubleshooting, and distributor service training.