331197A bearing: complete specifications & equivalents
The 331197A is a ANSI ABMA 19.2 radial bearing sized 384.175 x 546.1 x 222.25 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 384.175 mm |
| Outer diameter D | 546.1 mm |
| Width B | 222.25 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 3724 kN |
| Basic static load rating C0 | 8300 kN |
| Fatigue load limit Pu | 640 kN |
| Operating temperature | -40 to +120 °C |
| Mass | 161000 g |
| Manufacturer designation | SKF 331197 A |
| Standard | ANSI ABMA 19.2 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants |
| Last verified | 2026-09-29 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants) · extracted 2026-09-29
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & tdo-series range
| Bore d | 15.125 in |
|---|---|
| Outer diameter D | 21.5 in |
| Width B | 8.75 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 81 mm |
| Smallest bore in tdo-series | 101.6 mm |
| Largest outer diameter in tdo-series | 596.9 mm |
| Width range across tdo-series | 49.212–284 mm |
| Bore position in tdo-series (smallest first) | 20 of 23 |
| Bore above smallest tdo-series size | 282.57500000000005 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 331197A | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 331197A model number is decoded
Load sharing between the two rows of 331197A depends on the ground spacer; field re-grinding or mixing spacers from another unit — even of the same 331197 base — destroys the factory setting. Selection arithmetic: C 3724 kN and C0 8300 kN are ratings of the complete double-row unit, giving a C0/C balance of 2.23; the fatigue load limit Pu 640 kN is the floor for the adjusted-life calculation at the 384.175 mm bore. Journal and housing interface: the 384.175 mm bore takes a m6 shaft seat and the 546.1 mm outside diameter pairs with an H7 housing bore; the 222.25 mm width defines shoulder depth and the 161000 g mass is the dead load in thermal-growth calculations. The TDO/D execution of 331197A differs from sibling variants in internal detail — spacer style, rib execution or clearance class — while sharing the 384.175×546.1×222.25 mm boundary; the full designation including the variant is the only safe order reference. In the TDO X-arrangement the two cones of 331197A locate the shaft in both axial directions; the housing seat for the 546.1 mm double cup is a loose-to-transition fit so thermal growth does not preload the rows.The SKF 331197 A is a 384.175×546.1×222.25 mm TDO double-row tapered roller bearing — two roller rows on a common double cup, delivered clearance-set as one assembly weighing 161.0 kg.The code SKF 331197 A is not an ISO 355 number: double-row tapered bearings of this size follow SKF works numbering, where 331197 fixes the 384.175×546.1×222.25 mm envelope and the variant suffix (TDO/D) fixes the internal execution.
Typical equipment & failure modes
Common applications
- rolling-mill roll-neck bearings
- heavy-duty rolling-mill gearboxes
- large crusher and mineral-processing drives
- marine propulsion gearboxes
Known failure patterns
- axial clamping ring bolt relaxation that lets the clearance-set rows walk apart under reversing thrust
- unequal load sharing between the two roller rows when the centre spacer loses its factory grinding
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- electrical pitting on VFD-driven shafts without grounding protection
- electrical pitting on VFD-driven shafts without grounding protection
Selection pitfalls — read before you substitute
- Do not mix components between units of the same 331197 base number: cones, cups and spacers are matched per serial — interchange only complete assemblies.
- The 384.175 mm bore seat must be checked for ovality before mounting — at this size a worn seat lets the cone creep, and fretting debris then works between the rows of 331197A.
- Contamination control matters twice over for double-row units: particles trapped between the rows of 331197A cannot migrate out, so flush the housing before assembly and fit filtration matched to the oil flow.
- The 3724/8300 kN ratings are SKF catalogue 17000 values for this execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.
- Quote the full SKF 331197 A designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of 331197A?
The SKF 331197 A is a double-row tapered roller bearing of TDO design with 384.175 mm bore, 546.1 mm outer diameter and 222.25 mm overall width (15.125 × 21.5 × 8.75 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3724 kN, C0 8300 kN, fatigue load limit Pu 640 kN, mass about 161.00 kg.
What does the TDO/D variant code on 331197A mean?
Double-row tapered bearings of this size follow SKF works numbering: the base number 331197 fixes the 384.175×546.1×222.25 mm envelope, and the TDO/D code identifies the internal design variant — spacer execution, rib detail and clearance class. Same-envelope units under a different variant are not interchangeable without checking the variant meaning.
Why does the catalogue list no speed rating for 331197A?
Bearings of this size class run in slow, heavily loaded machinery where the permissible speed is set by the application heat balance rather than a universal table value. Plan lubrication and cooling against the 161.0 kg assembly mass and instrument the first run with temperature logging.
Can components of 331197A be interchanged with another unit of the same base number?
No — cones, cups and spacers of a double-row set are matched per serial and the clearance is set by selective grinding at the factory. Replace 331197A as a complete assembly in the same TDO/D variant.
How does 331197A react axial load?
The TDO design works as a fixed X arrangement: one double cup with two cones locates the shaft in both axial directions, with load shared between the two rows according to the factory-set clearance.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants on 2026-09-29. Read our editorial & correction policy.