RAYSDE BearingsFour Steps to Bearing Selection
Choosing the right bearing type is not complicated — just answer four questions:
Pure radial → deep-groove ball / cylindrical roller; pure axial → thrust ball / thrust roller; combined → angular contact / tapered roller / spherical roller
High speed (>3000 rpm) → deep-groove ball / angular contact ball; medium-low speed heavy load → tapered roller / spherical roller
Shaft deflection / non-concentric housings → self-aligning ball / spherical roller; rigid mounting → other types
Very tight → thin-section (67/68/69) / full-complement roller; normal → standard series
Quick Reference: The Twelve Major Types
| Bearing type | Main load | Speed | Typical applications |
|---|---|---|---|
| Deep-groove ball | radial + light axial | ★★★★★ very high | motors, pumps, fans, appliances |
| Angular contact ball | combined (radial + axial) | ★★★★☆ high | machine-tool spindles, CNC, precision equipment |
| Tapered roller | combined, heavy load | ★★★☆☆ medium | auto wheel hubs, gear reducers, mining |
| Spherical roller | very heavy radial + self-aligning | ★★☆☆☆ low-medium | crushers, cement mills, paper machines |
| Thrust ball | pure axial | ★★★★☆ high | vertical pumps, screw jacks |
| Thrust roller | pure axial, heavy load | ★★☆☆☆ low | extruders, cranes, marine |
| Needle roller | radial (space-limited) | ★★★☆☆ medium | gearboxes, piston pins, connecting rods |
| Linear motion | linear reciprocating | ★★★★☆ high | 3D printers, CNC guides |
| Self-aligning ball | radial + light axial + self-aligning | ★★★★☆ high | fans, conveyors, agricultural machinery |
| Spherical plain | oscillating / combined | ★★☆☆☆ low | hydraulic cylinders, automotive suspension |
| Pillow block (insert) | radial + easy mounting | ★★★☆☆ medium | conveyors, fans, agriculture |
| Full-complement (no outer ring) | radial (extreme space) | ★★★☆☆ medium | automotive gearboxes, gearboxes |
Common Misconceptions
- ❌ "More expensive = better" — spherical roller bearings are strong but slow and costly; for light loads a deep-groove ball bearing is enough.
- ❌ "Only big imported name brands are reliable" — RAYSDE OEM products are supplied from ISO 9001:2015 certified partner plants with better value for money.
- ❌ "Same dimensions = interchangeable" — check tolerance grade (C/P4), cage material and seal form differences.
Frequently Asked Questions
Which bearing type handles combined radial and axial load?
Angular contact ball bearings for light-to-medium combined loads, tapered roller bearings for heavy combined loads, and spherical roller bearings where heavy load coincides with shaft misalignment.
Which type for high speed above 3000 rpm?
Deep-groove ball bearings (most economical) or angular contact ball bearings (for combined loads and higher precision).
What if the shaft deflects or housings are not concentric?
Use self-aligning ball bearings for lighter duty or spherical roller bearings for heavy duty — both tolerate misalignment without edge loading.
Can RAYSDE help me choose the right bearing?
Yes. Send us your load, speed, shaft diameter and working environment and our engineering team will do a free selection analysis. RAYSDE is an independent supplier and is not affiliated with any original manufacturer.
📞 Not sure which to choose? Send us your equipment parameters (load, speed, shaft diameter, working environment) and the RAYSDE engineering team will do a free selection analysis. Enquire now