The inner hole of a spherical roller bearing is generally a cylindrical hole, but some sizes can also provide tapered bore bearings with a taper of 1:12 or 1:30 (applicable to 241, 240 size series), which are added with K or K30 in the bearing suffix code. Tapered bore bearings are fixed to the shaft using a tightening sleeve or a withdrawal sleeve, which can facilitate the installation and loading and unloading of the bearing.
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