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Applicable VFD→ https://www.amazon.com/dp/B0775BKKNJ?th=1 Introduction: The bearing adopts high speed angular contact bearing.And shell is cooled by liquid cycle to reduce the heat rise caused by high-speed rotation. Adopt precision steel ball holder to ensure the rotation precision of the spindle in high speed grinding. Lubricated with grease, which is resistant to 200 degrees high temperature. specification : ●Material: The cover is made of stainless steel, and the water jacket is high compression casting aluminum tube, red copper coil. ●Bearing: 6002 bearing (3pcs) ● Voltage and rated current: AC 220V, 6.8A ● Max Rotation Speed:24,000 RPM ●Radial runout: 0.01mm ●Coaxality: 0.025mm (2.5 microns) ● Frequencies: 400Hz ●Size: 80*188 (mm) ● Collet: ER11 collet, 6mm is standard ●Nut model: ER11-A(B) ●Cooling way: water cycling cooling way ●Lubrication way: high temperature resistance grease lubrication ●Power interface: GX16 water proof aviation plug marked with number 1, 2, 3, 4. Number 1, 2 and 3 interfaces are connected with inverter power U, V, W respectively. Number 4 is connected with earth wire