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

ER25 4kW Square Air-Cooled CNC Spindle Motor VFD Kit

The     ER25 4kW square air-cooled spindle motor kit    combines a 4kW CNC spindle, matching 4kW VFD and listed accessories for CNC router manufacturers, distributors and professional workshops. The spindle offers ER25 toolholding and published 220V/380V options; verify the chosen motor and drive versions before ordering.

  Request ER25 4kW Spindle VFD Kit Pricing  

ER25 4kW Spindle Motor Video

ER25 4kW Square Spindle and VFD Kit Overview

The     Zhong Hua Jiang ER25 4kW square air-cooled CNC spindle motor VFD kit    is a matched spindle-and-inverter package for CNC router manufacturers, professional machining shops, equipment resellers and industrial retrofit projects. It combines a 4kW square spindle motor with an included 4kW variable-frequency drive (VFD) for controlled CNC routing and engraving.

The published kit provides an     ER25 collet interface    , a     4kW VFD    , ER25 collets, drill bits, aviation cable, power cable and wrenches. Motor options are listed as     220V / 380V    , with a published speed range of     10,000–18,000 RPM    . Confirm the correct motor voltage, inverter input/output specification and packing configuration for each order.

Air cooling uses the motor’s fan and airflow path instead of an external cooling pump, tank or water circuit. This makes the set practical for woodworking CNC routers, sign-making machines and other suitable workshop systems where installation footprint, service access and machine compatibility are important.

  Get an ER25 4kW Square Spindle Kit Quote  

  View Zhong Hua Jiang CNC Product Catalogue 2025 (PDF)  

Zhong Hua Jiang CNC Product Catalogue (PDF)

ER25 4kW Square Spindle and VFD Specifications

The specification overview below distinguishes the included VFD from the spindle motor and identifies dimensions or accessory descriptions that should be checked before machine integration.

The 4kW square spindle-and-VFD kit is intended for high-frequency machining of wood, MDF, acrylic, PVC and other compatible materials. Review the table below and specify the required motor voltage, electrical supply, mounting requirements and toolholder configuration before requesting a quotation.

  Collet quantity confirmation:    The source packing table lists 13 ER25-6mm collets. Please request an itemized collet-size list before ordering. The listed     42 × 41 × 20cm    is a package reference, not a square-spindle body dimension.

  Confirm 4kW Spindle Kit Specification and Accessories  

CNC Routing, Engraving and Milling Applications

The described kit is intended for professional machining applications using appropriately selected tools. Actual capacity depends on the machine frame, rigidity, tool, workholding, cutting parameters and duty cycle.

Common applications include professional CNC woodworking, MDF panel routing, acrylic signage, PVC and plastics machining and selected light-duty aluminium or brass work. Tool choice, feeds, machine rigidity and safe spindle loading determine actual machining capability.

Wood, MDF and Furniture Panel Routing

Acrylic Signage, PVC and Plastic Machining

Light Aluminium and Brass Machining

Key Features of the ER25 4kW Spindle VFD Kit

Technical selection should begin with the complete spindle-and-inverter system: motor nameplate, matched VFD, controller wiring, collet setup and safe enclosure / cooling airflow.

This spindle package combines the square     4kW ER25 motor    and a     4kW VFD    with accessories for suitable CNC machine integration. Compared with motor-only replacement products, the kit is intended for buyers who also require the matching inverter and associated electrical connections.

For the listed version, the website publishes     220V/380V options    ,     10,000–18,000 RPM    and     10A    for the spindle. The VFD parameters must be set for the delivered motor rather than copied from a different motor series; verify the actual nameplate and the inverter manual before commissioning.

4kW VFD Control and Motor Matching

The included     4kW VFD inverter    provides the means to control spindle speed and operating parameters. CNC controller integration depends on the inverter interface, electrical wiring and supported control functions. Confirm the exact drive model and input power requirements with the supplier.

ER25 Collet and Cutter Shank Compatibility

The     ER25    system accepts suitably sized ER25 collets to grip compatible tool shanks. Select the collet according to the actual shank diameter. The published packing list says “13 × ER25-6mm Collets”; buyers should confirm the sizes and quantity of the supplied set before placing an order.

CNC Controller and PLC Interface Requirements

A compatible CNC or PLC controller may be able to command spindle start/stop and speed through the inverter’s supported interfaces. Check the selected inverter documentation for available terminals, analogue control, communication protocols and required programming.

220V / 380V Electrical Configurations

The product offers     220V and 380V variants    . The corresponding spindle and VFD must be matched to the site electrical supply, motor winding voltage, frequency and output-current requirements. A qualified technician should complete electrical installation, grounding and protection settings.

Speed Control and Rated RPM

The published spindle operating range is     10,000–18,000 RPM    . Set the maximum output frequency and spindle speed according to the exact motor nameplate and drive documentation. Images depicting other spindle versions do not change the rated limit of the ordered configuration.

Air-Cooling and Workshop Ventilation

The integrated air-cooling design avoids an external water-circulation unit. When installing the spindle, leave adequate space around air inlets and outlets, control dust accumulation and follow the manufacturer’s operation and cooling instructions.

  Ask About 220V / 380V ER25 VFD Kits  

Advantages of the Air-Cooled 4kW Spindle Kit

The retained product image shows information about speed and frequency upgrades across spindle versions. Always follow the rated parameters for the actual purchased 4kW motor; a generic marketing image does not override the product nameplate.

Dynamic Balancing and Vibration

The spindle maker describes dynamic balancing as a method of controlling vibration during operation. Cutting quality also depends on tool balance, tool clamping, spindle mounting, feed rate and the stiffness of the CNC machine.

Spindle Bearings and Construction

The published feature description mentions upgraded bearings, copper rotor windings and a square motor housing. Bearing material and arrangement should be specified for the exact supplied model; working life depends on load, temperature, dust exposure and maintenance.

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

Comparison measurements depend on the specified test instrument, collet, measurement position and conditions. Confirm acceptance criteria for precision-sensitive production orders.

Runout, Concentricity and Inspection

The retained comparison photos and table illustrate spindle runout examples, including a value below     0.005mm    . Precision-critical buyers should specify the collet, inspection point, measuring method and acceptable runout in the purchase agreement instead of relying on an illustrative comparison alone.

Spindle Runout Comparison

Square Spindle Installation

The kit includes aviation wiring, power wiring and three wrenches according to the original package list. The spindle housing is designed for a square-motor mounting arrangement. Check fixing holes, tool clearance, cable routing and electrical connections before machine assembly; verify VFD parameters before the first run.

Check the VFD Parameters Before Operation

Spindle Kit Packaging and Accessories

The original packing table under Technical Specifications provides the quantities. Check cable connector and length, VFD model and collet-size distribution when ordering.

  Request a Confirmed 4kW VFD Kit Packing List  

Zhong Hua Jiang offers ER25 4kW spindle kit configurations to distributors, machine builders and professional CNC users. Please include your required voltage, power supply, CNC controller, tooling, purchasing quantity and destination when requesting a matched-kit quote.

Related Air-Cooled CNC Spindle Motor Kits

Please select a related model using its own product specifications; 0.5kW through 4kW models can differ in housing format, collet, speed range, inverter power and included accessories.

Other air-cooled spindle kits are available for smaller ER11/ER16/ER20 toolholding requirements and alternative spindle housing styles. The links below lead to separate products with their own power ratings, package lists and inverter 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        

  Request Distributor and OEM Supply Information  

About Zhong Hua Jiang

Zhong Hua Jiang 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.

Manufacturing and Quality Practices

The company profile and images below describe Zhong Hua Jiang manufacturing activities. For regulated markets or controlled technical requirements, request model-specific inspection reports and applicable documentation.

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

Spindle Manufacturing Since 2000

Other CNC Machines and Accessories

CNC Router Machines

Zhong Hua Jiang CNC router machines include the 3018, 3020, 3040 and 6090 series for suitable routing, engraving and workshop applications.

CNC Spindle Motors

The company’s spindle product range includes round and square air-cooled spindles, water-cooled models and motor-and-VFD packages for differing machine designs.

CNC Accessories

CNC accessories include limit switches, Z probes, emergency-stop parts, and other control and setup components. Confirm compatibility with the target CNC machine.

Electrical Wires

Related cables include shielded and double-shielded wiring for CNC equipment, where grounding, shielding and cable routing matter for electrical noise control.

Stepper Motors

Stepper motors and related motion components are used for CNC axis movement and machine automation. Select appropriate torque, drive and control specifications for each system.

Manufacturer Certification Information

Customer Feedback

FAQ: ER25 4kW Air-Cooled Spindle VFD Kit

Answers below cover VFD matching, actual package contents, machining materials, square-spindle installation and wholesale orders. For an engineering quotation, provide the intended motor voltage and machine integration details.

1. What is included in the ER25 4kW air-cooled spindle motor VFD kit?

The original listed set includes one     4kW square air-cooled spindle motor    , one     4kW VFD inverter    , ER25 collets, ten drill bits, one aviation cable, one power cable and three wrenches. Verify the exact accessory mix and packing list on the quotation.

2. Is this a motor-only product or a spindle-and-VFD kit?

This page describes a     spindle-and-VFD kit    . The 4kW VFD is part of the published package. Buyers seeking only a replacement 4kW square spindle should request the separate motor-only product.

3. What is the spindle power and which collet system is used?

The motor power is     4kW    and the spindle toolholding interface is     ER25    . Select collets sized for the installed cutters and confirm the supplied collet sizes when ordering.

4. Does the kit include a 4kW or 3.7kW VFD?

The published packing list for this product specifies a     4kW VFD inverter    . It should not be confused with other 3kW or 3.7kW spindle kit configurations.

5. Is the ER25 4kW square spindle available in 220V and 380V?

The page lists     220V/380V options    . Select the appropriate matched spindle and inverter configuration for the facility supply; the input voltage of the supplied VFD must be confirmed separately.

6. What is the rated spindle speed?

The listed speed range is     10,000–18,000 RPM    . Configure the VFD using the delivered motor nameplate and do not exceed the allowable frequency or speed of the selected spindle.

7. What VFD frequency should be used with this spindle kit?

Match the VFD maximum frequency and motor parameters to the actual delivered spindle. Related 4kW spindle specifications refer to 300Hz operation, but the nameplate and kit-specific drive configuration are authoritative.

8. What does the published 10A current mean?

The listing gives     10A    as the motor current. Check the actual motor nameplate and inverter output-current rating for the selected 220V or 380V configuration before installation.

9. What does the specification “13 × ER25-6mm Collets” mean?

That is the wording in the original packing list, but it does not make the individual collet sizes clear. Ask the supplier for a confirmed itemized collet-size and quantity list to avoid toolholder mismatches.

10. Which drill bits come with the ER25 4kW VFD kit?

The published packing list specifies     ten drill bits    described as     0.8–3mm    with a     1/8-inch shank    . Confirm individual sizes and suitability for your machining material.

11. What is the spindle kit package size and weight?

The product content lists a     42 × 41 × 20cm    spindle package reference and     9.5kg    weight. These figures should not be used as square-motor mounting dimensions or confirmed gross shipping weight; request the actual installation drawing and packing data.

12. Does the square spindle require a round mounting clamp?

No round clamp should be assumed for this square spindle configuration. Compare the motor housing, mounting-hole pattern and CNC Z-axis bracket before ordering. The published kit list does not identify a round clamp.

13. What materials can the 4kW air-cooled CNC spindle machine?

Potential materials include wood, MDF, acrylic, PVC, other plastics and selected aluminium or brass operations. Feasibility depends on the machine rigidity, tool diameter, tooling material, cutting load, speed and feed settings.

14. Is this ER25 kit suitable for woodworking CNC routers?

It is intended for compatible CNC woodworking, routing and engraving systems. Check the CNC machine’s Z-axis load capacity, mount, available power supply, controller and operating conditions before installation.

15. Can the kit be used to mill aluminium or brass?

Selected light-duty machining of aluminium and brass may be possible when cutter geometry, machine rigidity, feed rates and workholding are appropriate. It is not a blanket guarantee of heavy metal-removal capability.

16. How does an air-cooled spindle differ from a water-cooled spindle?

Air-cooled models use airflow and do not need a cooling-water circuit. Water-cooled systems require a pump and coolant loop and may suit different noise or thermal-management requirements. Compare machine design and duty cycle before selection.

17. Can the included VFD be controlled by a CNC controller?

Potentially, using supported control terminals or communication interfaces. The available functions depend on the specific VFD model and CNC controller; confirm the interface and wiring diagram before procurement.

18. Is the VFD pre-programmed and ready to run?

The original description refers to a programmed VFD. Regardless of any preset settings, verify motor voltage, frequency, rated current, acceleration, protection settings and emergency-stop integration before commissioning.

19. What runout can be expected from the ER25 spindle?

The supplied comparison images illustrate a runout value below 0.005mm. For applications with strict tolerance requirements, agree the measurement method, test point and acceptance limit with the supplier; the illustration is not an individual-unit inspection report.

20. Which bearings are used in this square 4kW spindle motor?

The product content discusses upgraded bearings but does not provide an unambiguous bearing part specification for every variant. Ask for the exact bearing material and configuration on the offered spindle.

21. Can distributors and machine manufacturers request wholesale or OEM supply?

The supplier describes support for bulk purchasing and OEM configuration requests. Share expected quantities, voltage market, branding, cable requirements and equipment integration details to obtain a proposal.

22. What is the minimum order quantity for the ER25 4kW kit?

The published content describes trial and bulk-order discussions but does not state a fixed minimum quantity for all configurations. Confirm MOQ and any customization threshold for the required order.

23. What lead time is offered for standard and customized orders?

The source mentions typical ranges of 3–7 working days for standard items and 10–20 days for large or customized orders. These are indicative figures, not a confirmed commitment; request current production and shipping dates for the quotation.

24. What warranty and technical assistance are available?

The published information refers to a 12-month warranty and remote technical assistance. Confirm the warranty terms, covered components, local support arrangements and documentation for your specific order.

25. What information should be included in a request for quotation?

Include required quantity, destination country, available AC supply, motor voltage, CNC controller, square-motor mounting dimensions, target materials, cutter shank sizes and any OEM packaging or documentation requirements.

  Request a Wholesale Quote for ER25 4kW Spindle VFD Kit