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Identify bearing defects by knowing which frequencies to look for in your spectrum

Bearing Visualization

BPFO - Outer Race Defect

BPFI - Inner Race Defect

BSF - Ball/Roller Defect

FTF - Cage/Train Defect

Quick Lookup - Common Bearings

Or Enter Bearing Number

Database includes common SKF, FAG, NSK bearings

Bearing Geometry

Number of Rolling Elements Balls or rollers

Pitch Diameter (mm) Center of rolling elements

Ball/Roller Diameter (mm) Diameter of rolling element

Contact Angle (°) 0° for deep groove, 15-40° for angular contact

Operating Speed

Shaft Speed

1800 RPM

100 RPM Shaft Frequency: 30.0 Hz 10000 RPM

Calculated Bearing Frequencies

BPFO

107.3

Ball Pass Frequency Outer Race

2x: 214.6 | 3x: 321.9

BPFI

162.7

Ball Pass Frequency Inner Race

2x: 325.4 | 3x: 488.1

BSF

71.4

Ball Spin Frequency

2x: 142.8 | 3x: 214.2

FTF

11.9

Fundamental Train Frequency (Cage)

2x: 23.8 | 3x: 35.7

Bearing Frequency Calculator