Selecting the correct bearing type is one of the most impactful engineering decisions in machine design. The wrong choice leads to premature failures, excessive vibration and the costs of unplanned downtime. Here's a practical comparison of the three most common types.
Deep Groove Ball Bearings (e.g. SKF 6200 series)
Best for: General applications with moderate radial and axial loads.
- Load capacity: Moderate radial, light to moderate axial (both directions)
- Speed: Highest of the three types — ideal for high RPM applications
- Misalignment tolerance:Very low (0.1–0.3°)
- Noise/vibration:Lower — excellent for precision applications
- Typical applications: Electric motors, pumps, conveyor rollers, fans, gearboxes
Deep groove bearings are the workhorse of the industrial world. When in doubt, they are usually the right starting point.
Angular Contact Ball Bearings (e.g. SKF 7200 series)
Best for: Applications with combined radial loads and significant axial loads.
- Load capacity: Higher axial capacity than deep groove (one direction per bearing only; use pairs for bidirectional)
- Speed: High, although slightly lower than deep groove
- Misalignment tolerance:Very low
- Contact angle: 15°, 25° or 40° — larger angle = more axial capacity but lower speed
- Typical applications: Machine tool spindles, axial thrust pumps, automotive wheel hubs
Angular contact bearings must be axially preloaded. They are almost always used in pairs (back-to-back or face-to-face arrangement).
Cylindrical roller bearings (e.g. SKF NU/NJ series)
Best for: Heavy radial loads with limited axial load requirements.
- Load capacity: Very high radial (50–100% more than equivalent ball bearings); minimum or no axial capacity (design dependent)
- Speed: Moderate to high
- Misalignment tolerance:Very low
- Typical applications: Rolling mills, large electric motors, railway axles, crane wheels
Quick Selection Matrix
| Criteria | Deep Groove | Angular Contact | Cylindrical Rollers |
|---|---|---|---|
| Radial load | Moderate | Moderate | Very High |
| Axial load | Light | High (1 direction) | None/Light |
| Maximum speed | Very High | High | Moderate-High |
| Misalignment | Weak | Weak | Weak |
| Cost | Low | Medium | Medium-High |
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