Square ER25 220V/380V 4KW Air Cooled Spindle Motor Kit With VFD Kit for CNC Router Engraving Machine

 VIDEO OF CNC SPINDLE MOTOR

 ER25 4KW AIR COOLED SPINDLE MOTOR VFD KIT FOR CNC ROUTERS

The Zhong Hua Jiang ER25 4KW air cooled spindle motor VFD kit is designed for CNC router users, workshop builders, machine retrofit projects, and B2B buyers who need a powerful, reliable, and low-maintenance spindle solution for engraving, milling, and cutting.

This kit combines a square 4KW air cooled CNC spindle motor, a matched VFD inverter, ER25 tooling compatibility, aviation wire, power wire, wrenches, and accessories for efficient installation. It is suitable for woodworking, acrylic processing, PVC, PCB work, plastic, MDF, and light-duty machining of soft metals such as aluminum and brass.

Compared with water-cooled systems, the air-cooled design reduces maintenance because it does not require a water pump, water tank, or coolant line. For distributors, CNC machine manufacturers, and professional workshops, this helps simplify inventory, installation, and after-sales support.

 TECHNICAL SPECIFICATIONS

The ER25 4KW air cooled spindle motor kit is supplied as a matched spindle-and-inverter package for easier setup and stable CNC performance.

 APPLICATIONS & USE CASES

This 4KW CNC spindle motor kit is suitable for production shops, CNC router manufacturers, distributors, education labs, sign-making workshops, woodworking studios, and retrofit users who need higher cutting power than compact 0.8KW, 1.5KW, or 2.2KW spindles.

Wood

Acrylic

Soft Metals

 FEATURES OF CNC AIR COOLED SPINDLE MOTOR

The Zhong Hua Jiang ER25 4KW air cooled spindle motor kit is engineered for stable output, accurate tool holding, and simplified VFD operation. It supports professional CNC routing applications where torque, cooling efficiency, and spindle runout directly affect machining quality.

The kit includes an ER25 4KW air cooled spindle motor, a matched VFD inverter, 220V/380V options, aviation wire, power wire, wrenches, and accessories for fast installation. With 10,000-18,000 RPM speed capability, low runout, upgraded bearings, and dynamic balancing, it helps reduce vibration and improve cutting consistency.

Key Features of Air Cooled CNC Spindle Motor

User-Friendly VFD Control

The matched VFD inverter enables practical speed adjustment and easier operation for CNC router users, machine builders, and workshop technicians.

High-Precision ER25 Collet System

The ER25 collet design provides secure tool clamping, improved concentricity, and stable machining performance for engraving, milling, and cutting.

PLC and CNC Controller Compatibility

The VFD can be integrated with compatible CNC control systems for spindle start/stop and speed control according to machine configuration.

Reliable Electrical Configuration

The spindle kit supports 220V/380V configurations and is supplied with wiring accessories to support stable installation and operation.

Accurate Speed Regulation

The 10,000-18,000 RPM working range allows users to match spindle speed to wood, acrylic, PVC, plastics, PCB materials, and soft metals.

Optimized Air-Cooling Design

The air-cooled body helps dissipate heat without requiring a water pump or coolant circuit, reducing maintenance and simplifying CNC machine upgrades.

 ADVANTAGES OF AIR COOLED SPINDLE MOTOR

Advanced Dynamic Balance Design

Advanced dynamic balancing technology helps reduce vibration, lower working noise, and improve spindle stability during long CNC routing cycles.

Extended Working Life

The spindle uses upgraded steel bearings, an all-copper rotor coil, and a robust square body structure to support long service life under normal operating conditions.

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

High Accuracy & Concentricity

Additional spindle finishing and precision control help achieve runout of less than 0.005mm, improving surface quality and reducing tool vibration during CNC machining.

 10 TIMES PRECISION RUNOUT CONTROL 

Easy and Fast Installation

Pre-soldered aviation wire, installation holes on both sides, and a pre-programmed VFD reduce setup time for CNC machine retrofit and replacement projects.

 THE VFD HAS BEEN PROGRAMMED 

 PACKAGE OF AIR COOLED SPINDLE MOTOR

Whether you are a hobbyist, a professional CNC workshop, a distributor, or a machine builder, Zhong Hua Jiang can supply a suitable air cooled spindle motor solution. If the standard configuration does not meet your voltage, collet, packaging, or branding requirements, our sales and engineering team can support customized spindle motor kits.

 RECOMMENDED AIR COOLED SPINDLE MOTOR KITS

In addition to the ER25 4KW air cooled spindle motor VFD kit, Zhong Hua Jiang offers a full air cooled spindle motor range for different CNC router sizes, materials, and production requirements.

 ROUND 

ER11 0.5KW Air Cooled Spindle Motor Kit

ER11 0.8KW Air Cooled Spindle Motor Kit

ER11 1.5KW Air Cooled Spindle Motor Kit

ER16 1.5KW Air Cooled Spindle Motor Kit

ER20 2.2KW Air Cooled Spindle Motor Kit

ER20 3KW Air Cooled Spindle Motor Kit

 SQUARE 

ER11 1.5KW Air Cooled Spindle Motor Kit

ER16 1.5KW Air Cooled Spindle Motor Kit

ER20 2.2KW Air Cooled Spindle Motor Kit

ER20 3KW Air Cooled Spindle Motor Kit

ER25 4KW Air Cooled Spindle Motor Kit

 COMPANY PROFILE

 CNC SPINDLE MOTOR MANUFACTURER 

How We Started

Huajiang was founded in 2000, starting with the production of CNC engraving spindle motors and later expanding into VFD inverters and engraving machines.

To develop broader international markets, we established the Zhong Hua Jiang brand in 2018.

What Makes Us Proud

We hold patents for our air cooled spindle motor series, including patent No. 200730184245.5.

With more than 20 years of manufacturing experience, we export CNC spindle motor products to customers worldwide, including markets in the USA and Germany.

 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 built for precision engraving, cutting, prototyping, education, and workshop production.

CNC Spindle Motors

Our spindle motor range includes air-cooled and water-cooled spindle motors for CNC routers, engraving machines, and custom machine-building projects.

CNC Accessories

We supply CNC accessories such as limit switches, Z probes, and emergency stop buttons to improve machine safety, positioning, and workflow accuracy.

Electrical Wires

Shielded cables, double-shielded cables, and chain cables help reduce signal interference and support durable CNC machine wiring.

Stepper Motors

High-performance stepper motors provide precise motion control for CNC routers, engraving machines, and automation equipment.

 PRODUCT CERTIFICATION

 CUSTOMER FEEDBACK

 FAQ

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

The 4KW air cooled spindle motor is suitable for engraving, milling, and cutting wood, MDF, acrylic, plastics, PVC, PCB boards, plexiglass, and soft metals such as aluminum and brass. For harder metals or heavy metal removal, please confirm machine rigidity, tool type, feed rate, and cooling method before use.

2. What is included in the ER25 4KW air cooled spindle motor VFD kit?

The standard kit includes one 4KW square air cooled spindle motor, one matched 4KW VFD inverter, ER25 collets, drill bits, aviation wire, power wire, and wrenches. Package configuration can be adjusted for bulk or OEM orders.

3. Is this spindle motor suitable for CNC router upgrades?

Yes. This 4KW spindle kit is a strong upgrade option for CNC routers that need more cutting power, higher stability, and better tool holding than smaller 0.8KW, 1.5KW, or 2.2KW spindles. Please confirm mounting size, voltage, inverter compatibility, and controller wiring before installation.

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

Yes. Zhong Hua Jiang welcomes distributors, resellers, CNC machine builders, and wholesalers. We provide factory-direct pricing, stable supply, export support, technical documentation, and product configuration support for B2B buyers.

5. Do you offer OEM or customization services?

Yes. OEM and ODM services are available for logo, packaging, voltage configuration, collet type, wiring, bearing configuration, and kit combination. Our engineering team can help tailor the ER25 4KW air cooled spindle motor kit to your target market or machine design.

6. What is the minimum order quantity for this spindle motor kit?

For standard ER25 4KW air cooled spindle motor kits, small trial orders are accepted before bulk purchasing. For OEM or customized kits, the MOQ depends on branding, packaging, wiring, and configuration requirements.

7. How long is the production and delivery time?

For standard kits, the typical lead time is 3-7 working days after payment. For large or customized orders, production usually takes 10-20 days depending on quantity and configuration. International shipping options can be arranged based on destination and urgency.

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

Zhong Hua Jiang provides a 12-month warranty for spindle motors, VFD inverters, and related accessories. Each kit is inspected before shipment, and quality-related parts are supported during the warranty period.

9. Do you provide after-sales technical support?

Yes. We provide lifetime technical support by email, video call, or online communication. Our team can assist with installation, VFD parameter setup, wiring guidance, troubleshooting, and distributor-level documentation.