What does the standard RIC (radial internal clearance) designation C1 indicate?

The designation C1 in the context of radial internal clearance (RIC) indicates a very small clearance in rolling element bearings. This classification is important for applications where minimal movement or tighter tolerances are required for optimal performance and longevity of the equipment.

Bearings with a C1 rating are typically used in high-precision applications where excessive internal clearance could lead to vibrations, misalignment, or reduced load-carrying capacity. When the clearance is intentionally kept to a minimal level, it helps maintain the integrity and operation of the machinery, as it allows for more precise fits without the risk of excessive play that could cause wear or damage over time.

In contrast, the other designations, such as standard clearance, large clearance, or no clearance, would indicate different tolerances and allowances that may not suit applications needing very tight specifications.