Bearing Selection Calculator

Calculate required load ratings and service life for crane bearings.

1. Component & Bearing Type

2. Load Parameters

kN

kN

Shock Load Factor

3. Operational Life

RPM

Hours

Hours/Day

Selection Criteria

BEARING SPECS

Equiv. Dynamic Load (P): 0.0 kN
Includes shock factors
Req. Dynamic Rating (C): 0 kN
Minimum rating for desired life
Target Life: 0 hrs
Expected Service: 0 Years
Load Ratio Check
Formula: ISO 281 (L10 Life)

Recommended Minimum Life (L10h)

Component Minimum Life (Hours) Standard
Wheel Bearings 30,000 - 50,000 FEM 1.001
Drum Bearings 40,000 - 60,000 ISO 281
Sheave Bearings 25,000 - 40,000 ABMA Std
Gear Shafts 20,000 - 30,000 AGMA Std

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Understanding Bearing Selection for Cranes

Selecting the right bearing is crucial for the reliability of crane components like wheels, drums, and sheaves. This calculator uses the ISO 281 standard to determine the required Basic Dynamic Load Rating (C) for a desired service life.

Inputs Explained

  • Radial Load (Fr): The load acting perpendicular to the shaft axis (e.g., wheel load).
  • Axial Load (Fa): The load acting parallel to the shaft axis (e.g., side thrust on wheels).
  • Dynamic Factor: A safety multiplier to account for shock loads and vibrations (typically 1.1 - 1.5 for cranes).
  • X / Y Factors: Radial and Axial load factors used to calculate the Equivalent Dynamic Load (P). Depends on bearing type and Fa/Fr ratio.
  • Reliability Factor (a1): Adjusts the calculated life for higher reliability requirements (e.g., 99% survival rate).

Outputs Explained

  • Equiv. Dynamic Load (P): The combined load used for calculation, derived from Fr and Fa.
  • Req. Dynamic Rating (C): The minimum load rating the chosen bearing must have to achieve the desired life. Compare this with catalog values.
  • Expected Service: The calculated life in years based on daily operating hours.