Bearing Life Calculator - Free Online L10 Life Estimation Tool
Bearing Life Calculator
Calculate the L10 life of bearings based on applied loads, speed, and operating conditions. Essential tool for bearing selection and maintenance planning.
Bearing Configuration
From bearing catalog or manufacturer data
Loading Conditions
Operating Conditions
Bearing Life Guidelines
Typical L10 Life Targets
- • Household appliances: 1,000-5,000 hrs
- • Automotive: 5,000-10,000 hrs
- • Industrial machines: 20,000-50,000 hrs
- • Critical equipment: 100,000+ hrs
Load Factors (p)
- • Ball bearings: p = 3
- • Roller bearings: p = 10/3
- • Thrust ball: p = 3
- • Thrust roller: p = 10/3
How to use this calculator
🔘 How to Use This Calculator
- Select bearing type (ball, roller, etc.)
- Enter dynamic load rating (C) from catalog
- Input radial and axial loads
- Enter operating speed in RPM
- Select operating condition factors
- Calculate to find L10 life and modified life
📐 Bearing Life Formulas
Basic L10 Life
L10 = (C/P)^p × 10^6 revolutions
L10h = L10 / (60 × n) hours
Where:
C = Dynamic load rating
P = Equivalent dynamic load
p = 3 (ball), 10/3 (roller)
n = Speed (RPM)
Equivalent Load
P = X × Fr + Y × Fa
X, Y = Factors based on Fa/Fr ratio
Modified Life
Lna = a1 × a2 × a3 × L10
a1 = Reliability factor
a2 = Material/lubrication factor
a3 = Operating conditions factor
🌟 Practical Examples
6309 bearing, 3600 RPM, 2 kN radial load
L10 = 50,000 hours (5.7 years)
32210 taper roller, 500 RPM, combined loading
L10 = 80,000 hours with good lubrication
6205 bearing, 200 RPM, contaminated environment
Modified life = 15,000 hours
💡 Best Practices
- • Use manufacturer's latest catalog data
- • Consider all operating conditions
- • Account for shock loads with application factors
- • Verify mounting fits and tolerances
- • Monitor temperature during operation
- • Implement predictive maintenance
- • Keep detailed maintenance records
⚠️ Important Considerations
- • L10 = 90% survival probability only
- • Actual life varies widely (0.1 to 30× L10)
- • Fatigue is not the only failure mode
- • Poor lubrication is #1 cause of failure
- • Misalignment significantly reduces life
- • Temperature above 150°C requires special bearings
- • Static overload can cause permanent damage
About this calculator
Calculate bearing life (L10) based on load, speed, and bearing type. Essential for reliability and maintenance planning.
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