Read this exact catalogue record
NTN 6306 is recorded in the manufacturer catalogue as single row deep groove ball bearings. Its listed boundary dimensions are 30×72×19 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 specifications13 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Variant / construction | Single row deep groove ball bearings | |
| Bore diameter | d | 30 mm |
| Outside diameter | D | 72 mm |
| Width | B | 19 mm |
| Basic dynamic load rating | C | 29.5 kN |
| Basic static load rating | C0 | 15 kN |
| Fatigue load limit | Pu | 1.14 kN |
| Mass | ≈m | 0.36 kg |
| Internal clearance | CN | |
| Sealing | open | |
| Cage | pressed steel cage | |
| Minimum operating temperature | Tmin | -40 °C |
| Maximum operating temperature | Tmax | 120 °C |
Product characteristics3 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Catalogue construction | Deep groove ball bearing, radial contact, pressed steel cage, open | |
| Cage construction | pressed steel cage | |
| Closure construction | open |
Mounting dimensions3 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Min shoulder diameter IR | da min | 36.5 mm |
| Max shoulder diameter OR | Da max | 65.5 mm |
| Max shaft & housing fillet radius | ra max | 1 mm |
Dimensions and properties6 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Internal diameter | d | 30 mm |
| External diameter | D | 72 mm |
| Bearing/Inner ring width | B | 19 mm |
| Min fillet radius | rs | 1.1 mm |
| Radial clearance class | CN | |
| Mass | 0.36 kg |
Performance8 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Dynamic load | C | 29.5 kN |
| Static load | C0 | 15 kN |
| Fatigue limit load | Cu | 1.14 kN |
| Coefficient | f0 | 13.3 |
| Oil lubrication limit speed | N lim | 12000 r/min |
| Grease lubrication limit speed | N lim | 10000 r/min |
| Min operating temperature | Tmin | -40 °C |
| Max operating temperature | Tmax | 120 °C |