7238 BCBM /DB bearing
190 × 340 mm · dynamic rating 497.34 kN · static rating 810 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
7238 BCBM /DB specification
| Designation | 7238 BCBM /DB |
| Type | Matched pair of angular contact ball bearings (back-to-back) |
| Series | 72 light (pair) |
| Bore diameter d | 190 mm |
| Outside diameter D | 340 mm |
| Basic dynamic load rating C | 497.34 kN (497,340 N) |
| Basic static load rating C0 | 810 kN (810,000 N) |
| Ratio C0/C | 1.63 |
| Speed guide, grease lubrication | 2,340 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 7238 BCBM /DB means
| Code | Meaning |
|---|---|
| 72 | Angular contact ball bearing, light dimension series |
| 38 | bore code "38" = 38 × 5 = 190 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 7238 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 7238 BCBM /DB with C = 497.34 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 99.47 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 7238 BCBM /DB
Brand-by-brand equivalents for this exact designation are not yet in the Rotec AI cross-reference tables. The Cross-Reference tool accepts SKF, FAG, NSK, NTN, Timken, Koyo and NRB designations, and shows what is catalogued.
Where the 7238 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 7238 BCBM /DB is size 30 of 31 in the Rotec AI catalogue for the “72 light (pair)” series. The next size down, the 7236 BCBM /DB, has a bore of 180 mm and a dynamic rating of 471.42 kN. The next size up, the 7240 BCBM /DB, has a bore of 200 mm and a rating of 526.5 kN (+6%).
Common problems on bearings like the 7238 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 7238 BCBM /DB
What are the dimensions of a 7238 BCBM /DB bearing?
The 7238 BCBM /DB has a bore of 190 mm and an outside diameter of 340 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 7238 BCBM /DB bearing?
In the Rotec AI catalogue the 7238 BCBM /DB has a basic dynamic load rating C of 497.34 kN and a basic static load rating C0 of 810 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 7238 BCBM /DB bearing?
Brand equivalents for the 7238 BCBM /DB are not yet in the Rotec AI tables. Use the Cross-Reference tool to check other designations.