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 2300 series self-aligning ball bearings belong to the 11000 type (old designation 1600) cylindrical bore self-aligning ball bearing. Their core technical feature is that the outer ring raceway is spherical, which gives them self-aligning capability to compensate for shaft or housing deflection and mounting error. Taking the base model of this series, 2300, as an example, its key parameters and characteristics are as follows:
Basic dimensions: Bore diameter 10 mm, outer diameter 35 mm, width 17 mm, minimum chamfer 0.6 mm.
Rated load: Data vary slightly among brands. NSK data shows basic dynamic load rating (Cr) of approximately 10.1 kN and static load rating (C0r) of approximately 2.01 kN; KOYO data shows approximately 9.3 kN and 2.1 kN respectively.
Limiting speed: Typically up to around 18,000 r/min with grease lubrication, and approximately 22,000–24,000 r/min with oil lubrication.
Self-aligning angle: Under normal load, the permissible self-aligning angle is approximately 0.07–0.12 radians (about 4–7 degrees), subject to mounting dimension constraint.
Calculation factor: Constant e value is approximately 0.59–0.71 (varies by brand), and axial load factor Y2 is approximately 1.4–1.66.
Cage: Usually a pressed steel cage; some variants use a nylon cage (suffix TN1).
Tolerance and clearance: Standard products typically conform to ISO Class 0 (P0) tolerance, with CN radial internal clearance.
Variants: The series includes tapered bore variants (suffix K, taper 1:12), as well as derivative models with seal (e.g., 2RS) or shield.
| Inquiry | Bearing Designation | Dimension（mm） | Basic load ratings (kN) | Speed ratings(rpm) | Weight | ||||
|---|---|---|---|---|---|---|---|---|---|
| d | D | B | Cr | Cor | Grease | Oil | (Kg) | ||
