June 11, 2026

Bearing clearance classes: C2 (tighter than CN), CN (standard), C3, C4 (largest clearance) with typical micrometer gap ranges Bearing clearance classes: C2 (tighter than CN), CN (standard), C3, C4 (largest clearance) with typical micrometer gap ranges Quick Selection Chart

Introduction Internal clearance is one of the most misunderstood yet critical parameters in bearing selection. Choose the wrong clearance class, and your bearing will either overheat from excessive preload or vibrate from excessive slop. This guide explains what radial internal clearance (RIC) means, what each clearance class (C2 through C5) is designed for, and how