Spindle Taper: BT30 Outer Diameter: 100 mm Max. Speed: 12,000 rpm Bearing size: Ø40 Bearing Lubrication: Grease Clamping pull-force: 3 KN Kenturn has been designing, manufacturing, fabricating and marketing machine tool spindles of all kinds since 1983. The company prides itself on intensively studying spindle design and producing innovative technology.