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ER20 3KW Square Air Cooled
220V/380V
10000-18000 RPM
8kg
Air cooled
ER20
3KW
10A
Zhong Hua Jiang supplies an ER20 3kW square air-cooled CNC spindle motor kit with a 3.7kW VFD for CNC machine builders, distributors, wholesalers and professional workshops. The listed package includes a square spindle motor, matched inverter, ER20 collets, drill bits, aviation wire, power wire and two wrenches. Specify your mains voltage, machine controller and mounting dimensions when requesting a quotation.
Request ER20 3kW Square Spindle Kit Pricing
CNC Router Machine Catalogue 2025.pdf
The square ER20 3kW air-cooled spindle and inverter package is intended for CNC router manufacturing, spindle replacement and machine upgrades. It combines a square-body mounting format, ER20 tool clamping and adjustable VFD control. Electrical and mechanical compatibility should be checked against the machine before installation.
Typical applications include timber and MDF routing, sign making, acrylic machining, PVC and plastic cutting, PCB engraving and selected light-duty work on aluminum or brass. Results depend on cutter geometry, feed rate, machine rigidity, material and operating conditions.
The integrated air-cooling design does not need a separate water pump, coolant tank or recirculation lines. Keep the spindle air passages clear and provide sufficient ventilation around the installed motor, particularly during prolonged cutting operations.
| Motor configuration | 3kW square-body air-cooled CNC spindle |
| Kit inverter | 3.7kW VFD inverter, as listed in the kit contents |
| Voltage versions | 220V or 380V; select matching motor, VFD and mains version |
| Published kit speed | 10,000–18,000 RPM; verify the nameplate-rated operating range |
| Published current | 10A; confirm rating for the supplied voltage version |
| Tool interface | ER20; listed collet assortment 1–13mm |
| Spindle motor weight | Approximately 8kg in the published kit specification |
| Square-body dimensional reference | About 325 × 118 × 98mm for a related square-spindle version; confirm drawings |
| Cooling | Air-cooled; no water pump or recirculating lines |
| Machine interface | Square mounting face and mounting holes; verify hole spacing and Z-axis clearance |
The motor and VFD are a matched purchasing choice, but the final electrical ratings, speed limit and mechanical dimensions must be checked against the supplied product labels and technical drawings. A 3.7kW VFD rating does not change the spindle motor’s rated 3kW output.
| 1x | 3KW Square Spindle Motor |
| 1x | 3.7KW VFD Inverter |
| 13x | ER20 Collets (1mm-13mm) |
| 10x | Drill Bits (0.8-3mm, 1/8" Shank) |
| 1x | Aviation Wire |
| 1x | Power Wire |
| 2x | Wrenches |
| Packing-size reference: 42 × 41 × 20cm. Confirm carton dimensions and square-spindle mounting drawings when ordering. | |
| Spindle motor weight: approximately 8kg (published kit specification; confirm actual configuration). | |
Check electrical supply: specify 220V or 380V and verify the input/output ratings on the intended inverter. The motor and VFD voltage ratings are separate from the wall supply configuration.
Check CNC control: confirm whether the machine uses keypad control, analog speed input or a suitable controller interface. Configure motor voltage, current, rated frequency, acceleration and maximum speed to match the nameplate.
Check installation: obtain a dimensioned drawing for the square spindle body, fixing-hole pattern and tool clearance. Check Z-axis payload, ventilation space and dust management.
Discuss Voltage, Mounting and VFD Compatibility
The supplied 3.7kW VFD provides adjustable spindle control when correctly matched to the motor and mains supply. Confirm the inverter input voltage, output rating, motor current and parameter settings with the selected 220V or 380V configuration.
The listed package combines a 3kW square air-cooled spindle motor, 3.7kW VFD, 13 ER20 collets (1–13mm), ten 0.8–3mm drill bits with 1/8-inch shanks, aviation wire, power wire and two wrenches. The product specification panel lists 10,000–18,000 RPM and 10A; the permissible operating range must match the supplied motor nameplate and inverter setup.
A square air-cooled housing supports CNC mounting without liquid-cooling plumbing. Its footprint, mounting-hole pattern and ventilation clearance should be compared with the machine drawings before ordering a replacement or OEM batch.
A compatible VFD adjusts output frequency to control spindle speed. Configure rated motor voltage, rated current, maximum frequency, acceleration and deceleration according to the supplied motor and inverter manuals.
The ER20 collet system accommodates the listed 1–13mm collet assortment for suitable tool shanks. Choose the correct collet size for each tool and check tightening, cleanliness and measured runout after assembly.
Integration with a CNC controller depends on the selected VFD input terminals, signal type and controller output. Check whether speed control uses the inverter keypad, a compatible analog input or supported controller commands before wiring.
The product is offered in 220V and 380V configurations, with a published current rating of 10A. Voltage options refer to selectable versions, not to one universal motor or inverter. The mains supply and motor/VFD combination must be checked for the ordered version.
The published specification panel lists 10,000–18,000 RPM. Some descriptive material refers to 24,000 RPM; buyers should confirm the rated and permitted maximum speed on the motor nameplate before programming the VFD.
A related square motor listing gives a nominal envelope of approximately 325 × 118 × 98mm, while this kit lists 8kg spindle weight. Request the current dimensioned mounting drawing and confirm the actual motor weight before designing a mounting plate or arranging shipment.
Request 3kW ER20 Motor and VFD Specifications
Dynamic balancing helps control vibration at high spindle speed. Actual noise, surface finish and vibration also depend on tool balance, fixture rigidity, bearings and operating conditions.
The original product information describes a four-bearing design and copper winding construction. Service life depends on correct VFD parameters, ventilation, spindle loading, ambient conditions and maintenance; no fixed service-life period applies to every installation.
| Our Spindle Motor | Other Spindle Motor |
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| Reference runout: <0.005mm (test conditions apply) | Comparison example: 0.05mm (not universal) |
Precision machining and collet selection can improve concentricity. The comparison table shows reference runout figures of less than 0.005mm and 0.05mm, but measured performance depends on test position, speed, tool holder and measuring method. Request the inspection criteria for production purchases.
RUNOUT COMPARISON — CONFIRM MEASUREMENT CONDITIONS
The listed aviation wire and power wire support installation, but all electrical connections must be made according to the specific motor and VFD wiring diagrams. The square spindle housing needs a compatible mounting surface and correctly spaced fixing holes.
CHECK MOTOR AND VFD PARAMETERS BEFORE FIRST START
Spindle concentricity should be evaluated at a defined measurement point using a calibrated method. The comparison images are useful for understanding product features but do not replace batch inspection data or agreed acceptance criteria.
Ask for Runout Testing and Bulk Pricing
For CNC equipment manufacturers, distributors and professional repair workshops, Zhong Hua Jiang can discuss suitable motor-voltage versions, VFD control requirements, product labeling, packing configuration and projected order quantities. Send the existing machine drawings and supply details for configuration review.
For batch purchases, provide the target market, quantity, voltage version, spindle mounting constraints, preferred VFD interface, labeling requirements and delivery destination. This allows the sales team to quote the correct kit configuration rather than a different round or square model.
The standard package list covers the motor, 3.7kW inverter, ER20 collets, drill bits, two wires and two wrenches. Any additional clamps, mounting plates, adapters or control accessories should be listed separately in the purchase specification.
Get Distributor and OEM Kit Quotation
The related range covers smaller ER11/ER16 air-cooled spindle kits, 2.2kW ER20 options, 3kW round and square designs and higher-power models. Compare body shape, mounting interface, collet size, motor power and selected VFD configuration when evaluating alternatives.
Compare Square and Round Spindle Kits
Contact Zhong Hua Jiang for B2B Supply
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Quality AssuranceSpindle inspection and product-quality controls Inspection procedures for shipped products | Patents and CertificationsAir-cooled spindle design and manufacturing experience | Additional Brand ValueZhong Hua Jiang product range and export-market presence |
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Reasonable PriceDirect sourcing for distributor and OEM quotations Compare configuration, service and landed cost | Full Time ServiceTechnical discussion of mounting and VFD parameters Assistance with product and quotation questions | Fast and Reliable DeliveryLead time confirmed by order volume and configuration Export packing and shipment coordination |
Zhong Hua Jiang supplies CNC router machines such as the 3018, 3020, 3040 and 6090 series for engraving, cutting and smaller production workflows.
Spindle motor options include air-cooled and water-cooled designs for CNC routing, engraving and machining applications.
CNC accessories include limit switches, Z probes, emergency-stop components, collets and mounting hardware.
Shielded signal cables and shielded cable-chain wiring are available for CNC equipment installations.
Stepper motors support CNC positioning and motion-control applications.
Request a 3kW Square Spindle Kit Offer
The spindle is used for wood, plywood, MDF, acrylic, PVC, plastics and PCB engraving. Light-duty aluminum and brass work may be possible with suitable tooling, rigidity, feed rates and workholding. Material suitability is not a guarantee of a particular depth of cut or cycle time.
The published package list includes one 3kW square air-cooled spindle, one 3.7kW VFD, 13 ER20 collets (1–13mm), ten drill bits (0.8–3mm, 1/8-inch shank), one aviation wire, one power wire and two wrenches. A separate round-spindle clamp is not listed for this square-body kit.
Yes, where the machine can accommodate the square body and the electrical supply, VFD and CNC controller are compatible. Check the mounting-hole pattern, Z-axis load capacity, tool clearance and power connections before selecting a replacement.
Zhong Hua Jiang works with distributors, wholesalers, machine manufacturers and professional service companies. Send the intended market, annual demand, required electrical configuration and delivery location to request a commercial quotation.
Discuss voltage version, labeling, packaging, cable requirements and kit configuration with the supplier. Any changes to bearings, mounting details, wiring or accessories should be confirmed against the project specification before order acceptance.
Standard and customized order quantities can be discussed with the sales team. For OEM orders, provide the requested changes and estimated volume so that an applicable MOQ can be quoted.
The published guidance indicates 3–7 working days for standard configurations after payment and around 10–20 days for larger or customized orders. Actual production and shipping schedules depend on configuration, volume, destination and order confirmation.
The product information describes a 12-month warranty. Confirm the written terms, covered components, troubleshooting process and exclusions with the quotation, particularly for OEM and distributor orders.
Zhong Hua Jiang offers support for installation, parameter setup, wiring and troubleshooting. Supply the spindle nameplate, inverter model, controller details and fault information when requesting assistance.
The square version has a square housing and mounting interface. The round version uses a cylindrical body and its separate round clamp mount. Motor dimensions, hardware and kit contents must not be assumed interchangeable.
The published list does not include a round clamp mount. The square housing is intended to attach through compatible fixing points. Ask for the mounting drawing and request a separate bracket or adapter if your machine needs one.
The spindle motor is listed as 3kW, while the included inverter is rated 3.7kW. The higher inverter rating does not increase the motor’s rated output. Configure the VFD to the actual spindle nameplate.
The listing offers 220V and 380V options. Select a specific motor and inverter configuration for the available power supply; do not assume one motor or inverter is universally switchable between voltage systems.
The product specification panel lists 10,000–18,000 RPM, while some descriptive materials refer to 24,000 RPM. The correct maximum operating speed must be confirmed from the supplied motor nameplate and its VFD settings. Do not exceed the nameplate limit.
The kit listing gives approximately 8kg for the motor. A related square-spindle model lists about 325 × 118 × 98mm, while a larger dimension is also shown in packing information. Request the dimensioned motor drawing and carton details separately.
The original kit contents list 13 ER20 collets spanning 1–13mm. Check the ordered assortment and choose collets matched to the actual shank diameters of your cutting tools.
The package list includes ten 0.8–3mm drill bits with 1/8-inch shanks, one aviation wire, one power wire and two wrenches. Request confirmation of wire lengths, connector pinout and accessory quantities for the ordered batch.
Possibly, if the controller can provide a compatible start/stop or speed-control signal to the selected inverter. Check supported terminals, analog-signal ranges and wiring diagrams; specific controller compatibility is not assumed.
It may be suitable for light milling and engraving of these soft metals with suitable cutters, workholding, conservative depths of cut and machine rigidity. It should not be represented as a substitute for a heavy-duty steel-machining spindle.
Keep air passages clear of wood dust and debris, monitor sound and vibration, avoid overloading, and inspect tooling and collets regularly. Follow the motor and VFD manuals for grounding, bearing care and fault diagnosis.
Specify whether runout is measured at the spindle taper, collet or test bar, along with the measurement distance and speed. Request an inspection record if concentricity is a critical purchasing condition.
Provide quantity, destination market, mains voltage, controller model, required motor mounting, expected duty cycle, preferred packaging and any branding changes. The supplier can use these details to confirm the bill of materials, MOQ and commercial terms.
ER20 collets and related CNC accessories appear in the product range. For distributor stocking, confirm which replacement parts and VFD models are compatible with the supplied kit before placing a parts order.
A downloadable Zhong Hua Jiang CNC product catalogue is available on this page. For installation-specific dimensions, VFD parameters and electrical diagrams, request the documents for the exact voltage and motor version being purchased.
