Read this exact catalogue record
NTN NJ308 is recorded in the manufacturer catalogue as single row cylindrical roller bearings. Its listed boundary dimensions are 40×90×23 mm: bore d × outside diameter D × bearing/inner-ring width B.
Reference:NTN Europe public product catalogue; source checked 2026-10-01.
How to use the parameters
- Use the complete NTN marking when comparing this record. The base number alone does not establish the same closure, clearance, cage, load rating or speed across brands.
- Dynamic and static load ratings are catalogue reference values, not a permitted working load for every installation. Grease and oil speed entries describe separate lubrication conditions; do not treat the higher value as a general operating limit.
- Mounting dimensions such as shoulder diameters and maximum fillet radii are not the bearing boundary dimensions. Unknown precision, material, lubricant grade and application fitment are not inferred from similar products.
This is an independent technical reference, not an official drawing, a complete current catalogue or an approval for a vehicle or machine.
Technical data
Product specifications
Metric and imperial values are paired where the manufacturer provides both. Expand a section to review its parameters.
Core specifications12 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Variant / construction | Single row cylindrical roller bearings | |
| Bore diameter | d | 40 mm |
| Outside diameter | D | 90 mm |
| Width | B | 23 mm |
| Basic dynamic load rating | C | 65 kN |
| Basic static load rating | C0 | 57 kN |
| Fatigue load limit | Pu | 6.95 kN |
| Mass | ≈m | 0.671 kg |
| Internal clearance | CN | |
| Cage | pressed steel cage. | |
| Minimum operating temperature | Tmin | -40 °C |
| Maximum operating temperature | Tmax | 120 °C |
Product characteristics2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Catalogue construction | Single row cylindrical roller bearing, single direction for axial loads, separable, pressed steel cage. | |
| Cage construction | pressed steel cage. |
Mounting dimensions5 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Min shoulder diameter IR | da min | 48 mm |
| Small face shoulder max diameter | da max | 51 mm |
| Min inner ring GO diameter | dc min | 60 mm |
| Max shoulder diameter OR | Da max | 82 mm |
| Max fillet radius | ra max | 1.5 mm |
Dimensions and properties10 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Internal diameter | d | 40 mm |
| External diameter | D | 90 mm |
| Bearing/Inner ring width | B | 23 mm |
| Upper roller diameter | E | 77.5 mm |
| Under roller diameter | F | 53.5 mm |
| IR flange outer diameter | d1 | 58.4 mm |
| Min fillet radius | rs | 1.5 mm |
| Min fillet radius | r1s | 1.5 mm |
| Radial clearance class | CN | |
| Mass | 0.671 kg |
Performance7 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Dynamic load | C | 65 kN |
| Static load | C0 | 57 kN |
| Fatigue limit load | Cu | 6.95 kN |
| Oil lubrication limit speed | N lim | 9400 r/min |
| Grease lubrication limit speed | N lim | 8000 r/min |
| Min operating temperature | Tmin | -40 °C |
| Max operating temperature | Tmax | 120 °C |