The outer ring raceway is spherical, and its center of curvature coincides with the bearing center. Therefore, the inner ring, balls, and cage can rotate freely around the bearing center, providing self-aligning capability. This makes the bearing suitable for application such as transmission shafts where it is difficult to align the shaft and housing, or where the shaft is prone to deflection. Because the contact angle is small, the axial load capacity is also limited. A pressed steel cage is generally used.
The permissible self-aligning angle of self-aligning ball bearing is approximately 0.07–0.12 radians (4–7 degrees) under normal load condition. Please note that in some cases, depending on the relevant mounting dimension around the bearing, this self-aligning angle may not be achievable.
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The 1300 series belongs to the same self-aligning ball bearing family as the 1200 series, sharing the same basic self-aligning principle. However, the 1300 series is a light series, and for the same bore diameter, its outer diameter and width are generally slightly larger than those of the 1200 series, with corresponding differences in load capacity.
Spherical outer ring raceway: The outer ring raceway is spherical, with its center of curvature coinciding with the bearing center, allowing the inner ring, balls, and cage to deflect freely and compensate for errors caused by shaft deflection or difficulty in aligning the housing.
Misalignment limit: The relative misalignment between the inner and outer rings must not exceed 3 degrees.
Primarily radial load: Designed mainly to carry radial load and can also accommodate small axial load, but cannot carry pure axial load. Because the contact angle is small, axial load capacity is limited.
Load level: Taking NSK 1300 as an example, the basic dynamic load rating is approximately 8,100 N, and the static load rating is approximately 1,620 N (some sources list a dynamic load rating of 7,350 N; data varies).
Cage material: Commonly pressed steel cage (standard configuration for NSK 1300); some brands or suffixes offer synthetic resin (nylon) cage, such as HRB's 1300ATN.
Bore type: Standard is cylindrical bore; the suffix K indicates a tapered bore (taper 1:12).
Suitable for double-support arrangement where the shaft is prone to bending or where strict coaxiality of the housing bore cannot be guaranteed, such as transmission shaft and general machinery.
| Inquiry | Bearing Designation | Dimension（mm） | Basic load ratings (kN) | Speed ratings(rpm) | Weight | ||||
|---|---|---|---|---|---|---|---|---|---|
| d | D | B | Cr | Cor | Grease | Oil | (Kg) | ||
