Self Aligning Ball Bearing：2311

In Self Aligning Ball Bearing 2311, “2”: Indicates that the bearing type is a self aligning ball bearing. Self aligning ball bearings feature a spherical outer ring raceway and two rows of balls, allowing them to automatically adjust to angular misalignments of up to 2.5 degrees. This unique design makes them ideal for applications where shaft misalignment is likely to occur due to factors like installation errors, thermal expansion, or uneven loads. They are capable of handling both radial and axial loads simultaneously, providing excellent stability and reducing wear on connected components.

“3”: Indicates the bearing’s diameter series code. The diameter series code is used to represent the range of the bearing’s inner and outer diameter sizes. In the case of the 3 series, it typically indicates that the bearing’s dimensions belong to the medium series, which means the bearing has a moderate size and load-carrying capacity compared to other series. This series is well-suited for heavy-duty applications requiring balanced radial and axial load performance.

“11”: Indicates the bearing’s inner diameter code. The inner diameter is calculated by multiplying the code by 5, so for the 2311 bearing, its inner diameter is 11 × 5 = 55mm. This size makes it suitable for medium to large shaft applications in industrial machinery.

In the model 2311 bearing, the tolerance grade is not directly indicated but is usually assumed to be grade 0, the normal precision level. This grade balances dimensional accuracy and rotational smoothness for most general industrial applications. Higher precision grades (e.g., P5, P4) can be customized for specific needs requiring tighter tolerances.

In summary, the meaning of the bearing model 2311 is: self aligning ball bearing, medium series, inner diameter of 55mm, normal precision level. This type of bearing is widely used in heavy machinery such as mining crushers, large conveyor systems, construction equipment, and industrial gearboxes, where shaft misalignment and high loads are common. Its self-aligning feature ensures reliable operation, minimizes maintenance downtime, and enhances the durability of critical equipment.