S25 spindle housing itself is an FC30 casting, which further underwent precision boring and honing, and the material for spindle are alloy steels subjected to high frequency heat treatment. They are assembled with SKF Germany, NSK Japan and Taiwan TPI precision bearings which maintaining the spindle nose accuracy 0.002mm or less. Its maximum capacity RPM 12000 is suitable to mount on a CNC servo slide or hydraulic feed table for your machining applications. Feature: 1.Standard 3-phase AC motor 0.18kW is included, optional maximum power up to 0.37kW 2.Belt driven at fixed speed and incorporate a timing or Poly-V belt 3.Spindle taper ER20 is available 4.Available for servo driven at variable speeds 5.AC Induction Motor protection IP 54 6.Gearbox motor is available upon request