3578/3525

OpenCNVerified match
FAG3525

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Specifications

Bore diameter (d)44.45 mm
Outer diameter (D)87.31 mm
Width (B)30.16 mm
Dynamic load rating (C)50 kN
Static load rating (C₀)31 kN
Weight430 g
Max speed (grease)3,000 rpm
Max speed (oil)4,500 rpm

Why This Match Is Correct

✓Exact dimensional match (bore, OD, width)
✓Load ratings within tolerance
✓Seal type verified via manufacturer tables
✓Speed rating compatible

Equivalents Across Brands

BrandPart NumberSealClearanceStatus
FAG3525OpenCNProbable
FAG3578OpenCNProbable
FAG3578/3525OpenCNCurrent
Koyo3525OpenCNEquivalent
Koyo3578OpenCNEquivalent
Koyo3578/3525OpenCNCurrent
NTN3525OpenCNEquivalent
NTN3578OpenCNEquivalent
NTN4T-3578/3525OpenCNEquivalent
SKF3525OpenCNEquivalent
SKF3578OpenCNEquivalent
SKF3578/3525OpenCNCurrent
Timken3525OpenCNProbable
Timken3578OpenCNProbable
Timken3578/3525OpenCNCurrent

Seal Type

Open (No Seal)

No seals or shields. Allows external lubrication and cooling. Lowest friction, highest speed capability.

Best forClean environments with external lubrication systems. High-speed applications where heat dissipation matters.
Avoid forDirty, dusty, or wet environments. Applications without planned lubrication maintenance.
Examples
  • Machine tool spindles
  • Gearboxes with oil bath lubrication
  • High-speed precision equipment

Internal Clearance

Normal Clearance (CN)

Standard radial internal clearance. Suitable for most applications under normal operating conditions.

Best forGeneral-purpose use. Normal temperatures, standard fits, moderate speeds.
TemperatureUp to ~70°C operating temperature

Where This Bearing Is Used

Medium (44.45mm bore) — Typical Uses

  • Industrial electric motors (10-50 HP)
  • Gearboxes and speed reducers
  • Heavy-duty pumps
  • Conveyor systems
  • Machine tool spindles
  • Automotive wheel hubs
  • Centrifugal fans
  • Compressors