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Technical Clearance
Spherical Roller Bearing Clearance: CN, C3, and C4
Internal clearance is reduced by interference fits and by temperature differences
between the rings. Select the initial class only after checking the required
operating clearance, speed, load, vibration, lubrication, and machine position.
Clearance Selection Table
Class
Typical context
Data to confirm
CN
Normal operating conditions
Model, application, speed, load.
C3
Higher running temperature or tighter fit
Temperature, shaft fit, housing fit, speed.
C4
High heat, heavy interference, or vibration-sensitive duty
Application, heat range, duty cycle, current failure mode.
Special screen duty
Vibrating screens and shaker equipment
Screen model, RPM, acceleration, cage, current suffix.
Send application, speed, temperature, fits, model, and current clearance.
Operating Clearance Check
As a screening relationship:
operating clearance ≈ initial clearance − fit reduction − thermal reduction.
The actual calculation depends on bearing geometry, measured fits, material,
temperatures, load, and the applicable design method. Do not choose C3 or C4
from temperature alone.
Ask a Clearance Question
Send the application, speed, ring temperatures, bearing model, shaft and housing
fits, current suffix, load, and observed failure symptoms.
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