Bearing Selector

Dynamic and static load ratings against an L10 life target.

Bearing Selection Calculator

Rolling element bearing sizing, life calculations, and selection guidance

Load Parameters

Radial Load (Fr)

Axial Load (Fa)

Shaft Speed

RPM

Min. Shaft Diameter

Required Life (L10)

hrs

Load Direction:
Radial: Perpendicular to shaft axis
Axial: Along shaft axis (thrust)

Bearing Selection

Bearing Type

Lubrication Method

Required Reliability

Operating Temperature

°C

Contamination Level

Contamination:
0.0 = Clean room conditions
0.3 = Normal cleanliness
0.5 = Moderate contamination
1.0 = Heavy contamination

Recommended Bearing

Bore Diameter

25.00 mm

Outer Diameter

55.00 mm

Width

11.25 mm

Required Cr

26.02 kN

Actual Cr

33.82 kN

C0r (Static)

20.29 kN

Designation Format:

605

Life Calculation

Equiv. Load (P)

1720.00 N

Calculated L10

43940.00 hrs

Reliability Factor a1

1.00

Lube Factor a3

0.80

Combined aISO

0.52

Required Life

20000.00 hrs

✓ Life meets requirement (220% margin)

Speed & Static Safety

dn Value

37.50 ×10³

dn Limit

500.00 ×10³

Static Safety (S0)

9.84

Speed Ratio

7.50 %

✓ Speed within limits

✓ Static safety adequate (S0 ≥ 2)

Friction & Thermal

Friction Torque

51.60 mNm

Power Loss

8.11 W

Heat Generated

8.11 W

Est. Operating Temp

74.05 °C

Grease Life

8713.09 hrs

⚠ Re-lubrication required every 8713 hours

L10 Life vs Load

Reliability (Weibull)

Temperature Effect on Life

Bearing Type Comparison

Type	Radial	Axial	Speed	Misalign
Deep Groove Ball	●●●	●●	●●●●	●
Angular Contact	●●●	●●●	●●●	●
Cylindrical Roller	●●●●	-	●●●	●
Tapered Roller	●●●●	●●●●	●●	●
Spherical Roller	●●●●	●●	●●	●●●●

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Bearing Selection Calculator

Rolling element bearing sizing, life calculations, and selection guidance

Load Parameters

Radial Load (Fr)

Axial Load (Fa)

Shaft Speed

RPM

Min. Shaft Diameter

Required Life (L10)

hrs

Load Direction:
Radial: Perpendicular to shaft axis
Axial: Along shaft axis (thrust)

Bearing Selection

Bearing Type

Lubrication Method

Required Reliability

Operating Temperature

°C

Contamination Level

Contamination:
0.0 = Clean room conditions
0.3 = Normal cleanliness
0.5 = Moderate contamination
1.0 = Heavy contamination

Recommended Bearing

Bore Diameter

25.00 mm

Outer Diameter

55.00 mm

Width

11.25 mm

Required Cr

26.02 kN

Actual Cr

33.82 kN

C0r (Static)

20.29 kN

Designation Format:

605

Life Calculation

Equiv. Load (P)

1720.00 N

Calculated L10

43940.00 hrs

Reliability Factor a1

1.00

Lube Factor a3

0.80

Combined aISO

0.52

Required Life

20000.00 hrs

✓ Life meets requirement (220% margin)

Speed & Static Safety

dn Value

37.50 ×10³

dn Limit

500.00 ×10³

Static Safety (S0)

9.84

Speed Ratio

7.50 %

✓ Speed within limits

✓ Static safety adequate (S0 ≥ 2)

Friction & Thermal

Friction Torque

51.60 mNm

Power Loss

8.11 W

Heat Generated

8.11 W

Est. Operating Temp

74.05 °C

Grease Life

8713.09 hrs

⚠ Re-lubrication required every 8713 hours

L10 Life vs Load

Reliability (Weibull)

Temperature Effect on Life

Bearing Type Comparison

Type	Radial	Axial	Speed	Misalign
Deep Groove Ball	●●●	●●	●●●●	●
Angular Contact	●●●	●●●	●●●	●
Cylindrical Roller	●●●●	-	●●●	●
Tapered Roller	●●●●	●●●●	●●	●
Spherical Roller	●●●●	●●	●●	●●●●