Adapter sleeves are the most commonly used components for locating bearings with a tapered bore onto a cylindrical seat as they can be used on Plain Shaft Stepped Shafts They are easy to install and require no additional location on the shaft: When used on plain shafts, the bearing can be located at any position on the shaft. When used on stepped shafts together with an L-shaped spacer ring, the bearing can be accurately positioned axially, thereby facilitating bearing mounting and dismounting. Specifications Bore diameter d1: 50mm. Outside diameter small taper d: 55mm. Outside diameter lock nut d3: 75mm. Width B1: 45mm. Width lock nut B: 11mm. Width lock nut including lock washer B4: 12.5mm. Width lock nut including locking clip B5: mm. Thread G: M 55x2. Lock nut: KM 11. Locking device: MB 11. Hydraulic nut: HMV 11 E.