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Cylindrical Roller Bearing Spec Table
Cylindrical Roller Bearing Specifications — 18 sizes
KS B 2001ISO 15JIS B 1533
Cylindrical rollers carry high radial loads. Used in large motors, rolling mills, and gearboxes under heavy loads.
Practical Notes
- NU/NJ types allow axial float for thermal expansion. Use NJ/NUP for fixed side, NU for free side.
- Higher radial capacity than ball bearings but almost zero axial capacity. For axial loads, consider angular contact or tapered bearings.
Selection Guide
For high radial loads. Greater capacity than ball bearings; NU/NJ types allow axial float for thermal expansion compensation. Suitable for large motors, gearboxes, and rolling mills under heavy loads.
KSISOJISCylindrical Roller Bearing
6 sizesThe dimensions below are identical across KS B 2001 · ISO 15 · JIS B 1533.
| Nominal | d (Bore) | D (OD) | B (Width) | Cr | rpm |
|---|---|---|---|---|---|
| NU204 | 20 | 47 | 14 | 16800N | 14000 |
| NU205 | 25 | 52 | 15 | 21600N | 12000 |
| NU206 | 30 | 62 | 16 | 31900N | 10000 |
| NU208 | 40 | 80 | 18 | 49400N | 8000 |
| NU210 | 50 | 90 | 20 | 60000N | 6700 |
| NU212 | 60 | 110 | 22 | 81900N | 5600 |
Key Features
- Cylindrical roller line contact for high radial capacity; axial float allowed (NJ/NU types)
- NU (outer flanges) / NJ (inner one flange) / NUP (both) differ in axial constraint
- Separable inner/outer rings accommodate thermal expansion along shaft axis
Key Applications
Large motors, gearbox intermediate shafts, compressor cranks, railway axles, wind turbine main shafts
FAQ
Difference between NU, NJ, and NUP types?
NU: bidirectional axial float (thermal expansion). NJ: one-direction axial load. NUP: bidirectional axial load. Select by fixed/free-side design requirements.