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Bearing Lubrication Calculator

Calculate Grease Quantity & Relubrication Frequency

Optimize bearing life by applying the right amount of grease at the right intervals

Bearing Dimensions Reference
OD: 52mm B: 15mm d: 25mm Outside Diameter (OD) Grease fills ~30-50% of free space

Dimension Guide

OD - Outside Diameter (needed for grease calculation)
B - Bearing Width (needed for grease calculation)
d - Bore/Inner Diameter (needed for frequency)
Grease Zone - Where lubrication is applied

Formulas Used

G = 0.005 × OD × B (metric)
Where G = grams, OD = Outside Diameter (mm), B = Width (mm)
G = 0.114 × OD × B (imperial)
Where G = ounces, OD = Outside Diameter (in), B = Width (in)
t = K × [(14,000,000 / (n × √d)) - 4d]
Where t = hours, K = correction factors, n = RPM, d = bore (mm)
Unit System
Bearing Dimensions
Outer ring diameter
Total bearing width
Inner ring / shaft diameter
Affects frequency calculation
Operating Conditions
1800 RPM
10 RPM n × d = 45,000 (speed factor) 10000 RPM
Calculated Lubrication Requirements
Grease Quantity Per Application
3.9
grams
Amount of grease per relubrication
≈ 0.14 oz | ≈ 3.5 ml
Relubrication Interval
2,150
hours
Operating hours between applications
≈ 90 days @ 24hr/day
Annual Grease Usage
15.8
grams/year
Total yearly grease consumption
≈ 4 applications per year

🔧 Grease Gun Reference

3
Strokes (standard gun)

Based on standard grease gun output of ~1.35g (0.05 oz) per stroke.
Always calibrate your specific grease gun for accurate delivery.

💡 Tip: Weigh 10 strokes on a scale to determine your gun's actual output per stroke.

Applied Correction Factors (K = 0.40)

Temperature 1.0
Contamination 0.4
Moisture 1.0
Vibration 1.0
Position 1.0
Bearing Type 10.0
Understanding Bearing Lubrication

✅ Signs of Proper Lubrication

  • Bearing runs at normal temperature
  • Smooth, quiet operation
  • No visible grease leakage
  • Consistent vibration levels

❌ Signs of Under-Lubrication

  • Elevated bearing temperature
  • Increased noise/squealing
  • Higher vibration levels
  • Metal-to-metal contact sounds

⚠️ Signs of Over-Lubrication

  • Grease leaking from seals
  • Excessive heat from churning
  • Seal damage or blowout
  • Energy losses & higher current
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