Description & Features BN TYPE is the most popular line up of GG live center. It is used for almost every standard workholding operation. 4BN Morse Taper(MT4) Shank, 60-degree point. Accuracy guaranteed to 0.003mm (TIR 0.0001") Max RPM 3,800. Max Workpiece weight 800kg. Heat-treated point to HRc 60±2 for rigidity and long life. Head Diameter 69mm(2.717inch) Point Diameter 32mm(1.26inch) Triple bearing design for high precision concentricity. Special lip seal prevents ingress of dirt and coolant. Good for high speed turning, CNC work, and general manual lathe.