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 core features of the 1200 series are: a spherical outer ring raceway providing self-aligning capability, a relatively small permissible misalignment angle, and predominantly radial load capacity. The specific features are summarized below:
Spherical outer ring raceway: The outer ring raceway is machined as a spherical surface whose center of curvature coincides with the bearing center, allowing the inner ring, balls, and cage to deflect freely around the bearing center and thereby compensate for misalignment caused by mounting errors or shaft deflection.
Limited permissible misalignment angle: Although self-aligning, the relative misalignment between the inner and outer rings must generally not exceed 3 degrees. Some brands (e.g., SKF) specify a permissible angular misalignment of 2.5° for this series.
Primarily radial loads: Designed mainly to carry radial loads and can also accommodate small axial loads, but cannot carry pure axial loads.
Relatively lower load capacity: Because the contact area between the balls and raceways is small, the load capacity is lower than that of self-aligning roller bearings.
Various materials: Common options include pressed steel cages, synthetic resin (polyamide/nylon) cages, and in some cases machined brass cages.
Temperature limitation: If polyamide (nylon) cages are used, the operating temperature must generally be below 120°C.
Suitable for double-support arrangements where the shaft is prone to bending or where strict coaxiality of the housing bores cannot be guaranteed, such as paper machinery, transmission shafts, and general machinery.
| Inquiry | Bearing Designation | Dimension（mm） | Basic load ratings (kN) | Speed ratings(rpm) | Weight | ||||
|---|---|---|---|---|---|---|---|---|---|
| d | D | B | Cr | Cor | Grease | Oil | (Kg) | ||
