The self-aligning roller bearing has two kinds of inner holes, cylindrical and conical, and the taper of conical taper hole is 1:30 and 1:12. This kind of conical inner hole bearing is equipped with a set sleeve or a withdrawal sleeve, which can easily and quickly assemble the tapered inner hole self-aligning ball bearing on the optical shaft or the stepped machine shaft. Main uses: papermaking machinery, reduction device, railway vehicle axle, bearing seat of steel mill gear box, steel mill roller, crusher, vibrating screen, printing machinery, woodworking machinery, various industrial reducers, vertical self-aligning bearing with seat.