7240 BCBM /DB bearing
200 × 360 mm · dynamic rating 526.5 kN · static rating 860 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
7240 BCBM /DB specification
| Designation | 7240 BCBM /DB |
| Type | Matched pair of angular contact ball bearings (back-to-back) |
| Series | 72 light (pair) |
| Bore diameter d | 200 mm |
| Outside diameter D | 360 mm |
| Basic dynamic load rating C | 526.5 kN (526,500 N) |
| Basic static load rating C0 | 860 kN (860,000 N) |
| Ratio C0/C | 1.63 |
| Speed guide, grease lubrication | 2,160 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 7240 BCBM /DB means
| Code | Meaning |
|---|---|
| 72 | Angular contact ball bearing, light dimension series |
| 40 | bore code "40" = 40 × 5 = 200 mm |
| B | 40° contact angle |
| CB | Normal axial internal clearance for a matched pair (universal matching) |
| /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 7240 BCBM /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 7240 BCBM /DB with C = 526.5 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 105.3 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 7240 BCBM /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 7240 BCBM /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 7240 BCBM /DB belongs to the “72 light (pair)” series. The next size down, the 7238 BCBM /DB, has a bore of 190 mm and a dynamic rating of 497.34 kN.
Common problems on bearings like the 7240 BCBM /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 7240 BCBM /DB
What are the dimensions of a 7240 BCBM /DB bearing?
The 7240 BCBM /DB has a bore of 200 mm and an outside diameter of 360 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 7240 BCBM /DB bearing?
In the Rotec AI catalogue the 7240 BCBM /DB has a basic dynamic load rating C of 526.5 kN and a basic static load rating C0 of 860 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 7240 BCBM /DB bearing?
Use the Cross-Reference tool in Rotec AI to check brand equivalents for the 7240 BCBM /DB.