The use of an air bearing and high precision collet makes this NSK spindle perfect for ultra-precision machining applications. The air bearing mechanism means this spindle produces extremely low vibration or heat.Speed: 80,000 rpmShape: StraightDiameter: ø1.97" (ø50 mm)Rotating Direction: FWD. (CW)Max. Output: 22WWeight: 2 Lb 15.62 oz.• Proper Air Pressure for Air Turbine: 42~71PSI• Air Consumption for Air Turbine: 4.41CFM (71PSI)• Proper Air Pressure for Air Bearing: 71PSI• Air Consumption for Air Bearing: 2.3CFM (71PSI)• Spindle Accuracy: Within 1 μm• Bearing Load Capacity - Radial: Less than 8N (71PSI),Thrust: Less than 14N (71PSI) • Length of Motor Hose: 6 ft Standard• Hose Diameter : Air Intake · Bearing - ø6.0 mm (O.D.)Exhaust Air - ø8.0 mm (O.D.)• Standard Size Collet Chuck (CHA-3.175): ø1/8"• Useable Max. Diameter of Grindstone: ø0.31"Included Equipment:• Collet Chuck ø1/8" (CHA-3.175): 1 pc.• Chuck Nut (K-263) • Wrench (10 x 10), (12 x 14): 1 pc. each• Silencer (K-208)• Intake Air Hose (K-215): ø6 mm x 6 ft., 1 pc.• Intake Air Hose (K-254): ø6 mm x 6 ft., 1 pc.• Exhaust Air Hose (K-216): ø8 mm x 3 ft., 1 pc.< Optional >• Collet Chuck (CHA-[][]): ø0.5 mm~ø4.0 mm in 0.1 mm increments and ø2.35 mm, ø1/8"• Chuck Nut (K-263): For Collet Chuck (CHA)