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

    5 out of 5 based on 1 reviews | Write a review
    Water cooled spindle motor with 6 kW high power, 24000 rpm high speed, 3.18 Nm torque, 3 phase 380V AC at 400Hz, ER25 collet. The complete combo of spindle motor and VFD suitable for CNC machine.
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    Delivery date: 6-12 days

    6 kW water cooled CNC spindle motor for sale at cheap price, 24000 rpm speed, 3.18 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 STZ125-6.0z-ER25
    Matched VFD Model GK3000-4T0075G (10 hp three phase VFD)
    GK3000-CS0075G (10 hp 1-phase 220V to 3-phase 380V VFD)
    Power 6 kW
    Diameter φ125 mm
    Phase Three phase
    Speed 24000 rpm
    Voltage 3-phase 380V±10% AC
    Current 14.5A
    Frequency 400Hz
    Torque 3.18 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 25 kg
    PDFDownload Attachments 6 kW Water Cooled Spindle Motor CAD Drawings



    6000W Water Cooled CNC Spindle Motor Details

    Tips: High Speed Spindle Motor Internal Structure

    1. The main rotating body of the high-speed spindle motor is the shaft. Manufacturing accuracy directly affects the final accuracy of the spindle motor. The finished product has high requirements for the dimensional accuracy of the rotating shaft. When the rotating shaft is running at high speed, the eccentric mass causes vibration, which seriously affects its dynamic performance. Therefore, strict dynamic balance testing of the rotating shaft is required. The parts installed on the shaft should also be tested for dynamic balance along with the shaft.
    2. The core supporting component of the high-speed spindle motor is a high-speed precision bearing. Because the higher speed of the motor spindle depends on the function, size, arrangement and lubrication method of the bearing. Therefore, this kind of bearing needs to have the advantages of good high-speed performance, high dynamic load carrying capacity, good lubrication performance, and low heat generation.
    3. Whether the high-speed motor spindle is in good condition is also greatly affected by the lubrication system. The typical lubrication method is to use oil mist lubrication or air-oil mixture lubrication. The former is mainly to atomize the lubricating oil to lubricate the bearing, and the lubricating oil cannot be recycled, which causes serious air pollution. The latter is to directly blow the lubricating oil into the bearing with high-pressure air, which not only lubricates but also plays a role in heat dissipation.

    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 least.

    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 6 kW Water Cooled CNC Spindle Motor, 24000 rpm, ER25
    Great buy
    I bought a 6kW water-cooled spindle motor for my CNC machine tool. Good choice, good user experience. We haven't had any problems yet.
    From: Sherwin | Date: 27/04/2022
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