7209 BECBP /DB bearing
45 × 85 mm · dynamic rating 61.56 kN · static rating 57 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
7209 BECBP /DB specification
| Designation | 7209 BECBP /DB |
| Type | Matched pair of angular contact ball bearings (back-to-back) |
| Series | 72 light (pair) |
| Bore diameter d | 45 mm |
| Outside diameter D | 85 mm |
| Basic dynamic load rating C | 61.56 kN (61,560 N) |
| Basic static load rating C0 | 57 kN (57,000 N) |
| Ratio C0/C | 0.93 |
| Speed guide, grease lubrication | 9,000 rpm |
| Life exponent p | 3 (ball bearing) |
Values come from the Rotec AI bearing catalogue and are indicative. Confirm against the manufacturer's current catalogue before ordering. Not every dimension (such as width) is listed here.
What the designation 7209 BECBP /DB means
| Code | Meaning |
|---|---|
| 72 | Angular contact ball bearing, light dimension series |
| 09 | bore code "09" = 9 × 5 = 45 mm |
| B | 40° contact angle |
| E | Optimized internal design |
| CB | Normal axial internal clearance for a matched pair (universal matching) |
| P | Glass-fibre-reinforced PA66 cage, ball-centred |
| /DB | Two bearings mounted back-to-back as a matched pair — carries combined radial + axial load from both directions with high stiffness |
Basic rating life of the 7209 BECBP /DB
Basic rating life is L10 = (C / P)p million revolutions, where P is the equivalent dynamic load and p = 3 (ball bearing). For a 7209 BECBP /DB with C = 61.56 kN, the table shows what that gives at different load levels. It is the ISO 281 basic life only: it does not include lubrication, contamination, misalignment or reliability modifiers.
| C / P | P as share of C | L10 (million rev) | L10 at 1,500 rpm | L10 at 3,000 rpm |
|---|---|---|---|---|
| 3 | 33.3% | 27 | 300 | 150 |
| 5 | 20.0% | 125 | 1,400 | 690 |
| 8 | 12.5% | 512 | 5,700 | 2,800 |
| 12 | 8.3% | 1,728 | 19,200 | 9,600 |
For example, a C / P of 5 means the equivalent load is 12.31 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 7209 BECBP /DB
Brand-by-brand equivalents for this exact designation are not shown here. The Cross-Reference tool accepts SKF, FAG, NSK, NTN, Timken, Koyo and NRB designations, and shows what is catalogued.
Where the 7209 BECBP /DB is used
Angular-contact ball bearings are chosen for: Combined radial and axial load; precision/high-speed arrangements. Typical equipment: Pumps, compressors, spindles, generators, aerospace accessories. Often paired/preloaded; contact angle and lubrication matter.
Other sizes in the same series
The 7209 BECBP /DB belongs to the “72 light (pair)” series. The next size down, the 7208 BEP /DB, has a bore of 40 mm and a dynamic rating of 55.89 kN. The next size up, the 7210 BEP /DB, has a bore of 50 mm and a rating of 61.07 kN (-1%).
Common problems on bearings like the 7209 BECBP /DB
Most field failures trace back to lubrication, contamination, fits and alignment rather than the bearing itself. These guides explain how to recognise and prevent them:
Questions about the 7209 BECBP /DB
What are the dimensions of a 7209 BECBP /DB bearing?
The 7209 BECBP /DB has a bore of 45 mm and an outside diameter of 85 mm. It is a matched pair of angular contact ball bearings (back-to-back). Series: 72 light (pair).
What is the load rating of a 7209 BECBP /DB bearing?
In the Rotec AI catalogue the 7209 BECBP /DB has a basic dynamic load rating C of 61.56 kN and a basic static load rating C0 of 57 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 7209 BECBP /DB bearing?
Use the Cross-Reference tool in Rotec AI to check brand equivalents for the 7209 BECBP /DB.