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    4.5 kW Water Cooled CNC Spindle Motor, 24000 rpm, ER25

    5 out of 5 based on 2 reviews | Write a review
    Cheap price spindle motor for CNC router machine, it features with 4.5 kW, 24000 rpm, 2.38 Nm torque, water cooled of cooling method, ER25 collet, 4pcs spindle bearings, 380V AC volage and 400Hz frequency.
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    Delivery date: 6-12 days

    4.5 kW water cooled CNC spindle motor for sale at affordable price, 24000 rpm speed, 2.38 Nm torque, 400Hz frequency, 3 phase 220V/380V AC operating voltage, ER25 (φ3.175 mm - φ16 mm) collet.


    • Spindle motor with superior durability ER25 collet ensures smooth running.
    • Fast response, strong overload capacity, low noise and high mechanical precision.
    • High quality 4 pcs bearings (7007Cx2 + 7005Cx2), runout off less than 0.01mm, tapered bore less than 0.005mm.
    • P4 grade ceramic ball bearings used as spindle bearing, which improves the service life under high speed revolution.
    • Lubricated with grease, which is resistant to 200 degrees high temperature.
    • Tight sealing and two-layer dustproof design.


    This series water cooled electric spindle motors mainly match with variable frequency drives or engraving machines, CNC router machine, and used for high speed profiling, drilling, cutting, engraving and groove milling of wood, metal, plastics, foam, rubber and other materials.

    Note: The spindle motor and VFD shall be suitable with each other. The specifications and parameter settings of the VFD shall match the nominal parameters of the spindle motor. Otherwise, it will burn the spindle motor if the settings are not correct.


    Model STZ125-4.5-ER25
    Power 4.5 kW
    Diameter φ125 mm
    Phase Three phase
    Speed 24000 rpm
    Voltage 3-phase 380V±10% AC 3-phase 220V±10% AC
    Current 12A 14.5A
    Matched VFD Model GK3000-4T0075G (10 hp three phase VFD) GK3000-4T0055G (7.5 hp three phase VFD)
    Frequency 400Hz
    Torque 2.38 Nm
    Number of Pole 2 poles
    Cooling Type Water-cooled
    Installation Method Horizontally or Vertically (When the motor is installed, the radial runout standard is required to be within 5um, and the chuck is generally 10um-15um.)
    Lubrication Grease
    Thermal Class Class F
    Protection Class IP50
    Certification CE
    Warranty Bearings for half a year, other parts for one year
    Joint of Nose ER25 (φ3.175 mm - φ16 mm)
    Bearings Type 7007C P4*2 & 7005C P4*2
    Application Woodworking & Plastic
    Weight 23 kg



    4500W Water Cooled CNC Spindle Motor Details

    Tips: How to Maintain a Spindle Motor?

    1. The high-speed spindle motor is the core component of the machining machine tool. The correct use and maintenance of the spindle motor has an extremely important impact on the improvement of the machining accuracy of the CNC machine tool and the extension of the service life.
    2. Do not use compressed air to clean the spindle motor to avoid bringing dust into the spindle gap and damage the spindle bearing.
    3. When cleaning the area around the spindle motor, although the spindle is stopped, the machine tool should be powered on, and the spindle bearing should be protected by air curtain.
    4. When the spindle motor is in use, pay attention that the cutting fluid should be hit on the cutting tool, not on the end of the spindle.
    5. For the tool mounted on the spindle motor, the handle part must be cleaned regularly with a clean soft cloth to avoid bringing dust into the spindle taper hole. Even when not in use, a tool holder should be reserved on the spindle to protect the spindle taper hole.
    6. For a new spindle motor or a spindle motor that has not been used for more than one month, it must be ensured to rotate at a low speed when it first starts to work, and it is best to perform the spindle preheating and idling.
    7. In order to ensure the high precision of the spindle motor, only accurate dynamic balance up-to-standard tools can be used during high-speed operation. It is best to preheat the spindle motor for 30 minutes to reach a thermally stable state for high-precision cutting.

    Safety Tips for Using ATO CNC Spindle Motors

    1. The electric spindle motor and VFD shall be suitable with each other. The specifications and parameter settings of the VFD shall match the nominal parameters of the spindle motor, and it will burn the spindle motor if the settings are not correct.

    2. Before using water-cooled spindle motor, it shall ensure that cooling cycle system works normally and the running under no cooling conditions is prohibited. The volume of cooling water is calculated as per 1 liter/minute, the minimum flow of cooling water is not less than 5 liter/minute, cooling water pipe and the nozzle shall be connected reliably and there is no leakage.

    3. The cooling liquid shall be clean and free of grease and the temperature shall be within 5-30℃. The cooling medium shall carry out force cooling when the ambient temperature is higher than 30℃. The precision lathe requires the cooling liquid with a constant temperature of 20 +/-2℃.

    4. During storage and transport of the spindle motor, the status of high-speed grease inside the bearing will change. The user shall run it at a low speed first by starting from the lowest speed of the spindle motor for 30 minutes and then 20 minutes for every 3000 rounds. Otherwise there will have abnormal sound, noise, heat and other phenomena, which will affect the bearing life if the spindle motor is started directly at a high speed. During long term storage, the spindle motor shall run (at low speed) for 15-30 minutes once a week at last.

    5. Collet, nut and inner taper hole shall be washed clean when installing blades on the spindle motor in order to avoid any impact on the precision. The blade handle shall be inserted into the collet more than 15mm.

    6. For daily machining, the spindle motor shall be warmed up, run for 15-20 minutes when the machining speed is reached and then performs precise machining. It is better to stop the spindle motor for two hours every day in order to recover its mechanical fatigue and prolong its life time.

    7. No knocking the end cover of the spindle motor. No hammering the collet and blade head when removing blades. No shocking or colliding during transport, storage and using, especially the end of the spindle motor.

    8. The spindle motor shall run in designated direction.

    9. The spindle motor shall be installed and fixed according to the relevant drawings and instructions.

    10. The temperature shall be within 22-25℃ if water cooling machine is used.

    11. The spindle motor adopts vapor lock and the gas source shall not be used until it has passed oil-water separator and dry filter. The air pressure is 0.2-0.25Mpa and the filtering precision is 5μm, otherwise there will cause damages to the bearing.

    Existing reviews of 4.5 kW Water Cooled CNC Spindle Motor, 24000 rpm, ER25
    What is the recommended water flow rate (L/min) for this spindle motor? Also this spindle will be used for milling and engraving marble using water cooling for the cutting operations. I see that this spindle is rated IP50 so there is no water protection. Do you have any recommendations to protect the spindle from water ingress? The VFD frequency is still 400hz correct?
    From: Fredric | Date: 11/06/2024
    Was this review helpful? Yes No (0/0)
    ATO Responded
    1. Yes, The motor frequency is still 400hz, this spindle motor only changes the voltage option, leaving the others unchanged. So the VFD you use must support the 400HZ option.
    2. This spindle motor is suitable for marble processing, and the IP50 protection level is sufficient.
    When the spindle motor is working, it is recommended to use coolant circulation for cooling, or you can use clean cold water (5-20℃). Just ensure that the cooling water flow rate is Not less than 5L/min when the motor is working.
    Do you provide spindle motors with air cooling?
    Do you provide a round shape spindle motor with air cooled?
    From: Audral | Date: 27/10/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, we provide, but this motor is not suitable for processing hard materials, such as iron.
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