Basic design bearings

Basic design self-aligning ball bearings (fig. 1) are available with a cylindrical bore and, for certain sizes, with a 1:12 tapered bore (designation suffix K).
Large self-aligning ball bearings in the 130 and 139 series, originally developed for specific applications in the paper industry, can be used in any application where low friction is preferred over high load carrying capacity. These bearings are equipped with an annular groove and three equally-spaced lubrication holes in the outer ring and six equally-spaced lubrication holes in the inner ring (fig. 2).
The balls of some bearings in the 12 and 13 series protrude from the side faces of the bearing (fig. 3). The values of the protrusion are listed in the product tables and should be considered when designing components in close proximity to the bearing.
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