331158A bearing: complete specifications & equivalents
The 331158A is a ANSI ABMA 19.2 radial bearing sized 384.175 x 546.1 x 193.675 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 | 193.675 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 | 152000 g |
| Manufacturer designation | SKF 331158 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 & tdi-series range
| Bore d | 15.125 in |
|---|---|
| Outer diameter D | 21.5 in |
| Width B | 7.625 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 81 mm |
| Smallest bore in tdi-series | 203.2 mm |
| Largest outer diameter in tdi-series | 595 mm |
| Width range across tdi-series | 84–263.525 mm |
| Bore position in tdi-series (smallest first) | 17 of 25 |
| Bore above smallest tdi-series size | 180.97500000000002 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 331158A | 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 331158A model number is decoded
Load sharing between the two rows of 331158A depends on the ground spacer; field re-grinding or mixing spacers from another unit — even of the same 331158 base — destroys the factory setting. Dividing C 3724 kN by the 384.175 mm bore gives 9.69 kN per millimetre of journal — heavy-section density typical of double-row tapered units built for slow, heavily loaded shafts. Dimensional interchange map: within its boundary plan the 384.175×546.1×193.675 mm envelope of 331158A is fixed, so shoulder, spacer and seal drawings can be dimensioned straight from the catalogue table. Variant check: catalogue siblings of 331158A carry different variant suffixes at the same boundary dimensions; the TDI/GWIY2 code on this unit is not a cosmetic mark — it fixes the internal setting and must match on replacement. TDI mounting: the double cone takes the m6 shaft seat at 384.175 mm bore, and the two single cups are seated separately in the housing — check cup-face contact around the full circumference before axial clamping.The SKF 331158 A is a 384.175×546.1×193.675 mm TDI double-row tapered roller bearing — a double cone with two cups, delivered clearance-set as one assembly weighing 152.0 kg.Numbering for double-row tapered bearings is works-specific: 331158 denotes the envelope (384.175 mm bore, 546.1 mm OD, 193.675 mm width) and the suffix the internal design — two bearings with the same base number but different variants are not interchangeable without checking the variant meaning.
Typical equipment & failure modes
Common applications
- heavy-duty rolling-mill gearboxes
- large crusher and mineral-processing drives
- wind-turbine main shafts
- large industrial mixer shafts
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
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- edge loading from shaft deflection or housing misalignment
- electrical pitting on VFD-driven shafts without grounding protection
Selection pitfalls — read before you substitute
- Contamination control matters twice over for double-row units: particles trapped between the rows of 331158A cannot migrate out, so flush the housing before assembly and fit filtration matched to the oil flow.
- Lifting 331158A by one ring separates the assembly; sling through the 384.175 mm bore or use the shaft as the lifting member.
- Contamination control matters twice over for double-row units: particles trapped between the rows of 331158A 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 331158 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 331158A?
The SKF 331158 A is a double-row tapered roller bearing of TDI design with 384.175 mm bore, 546.1 mm outer diameter and 193.675 mm overall width (15.125 × 21.5 × 7.625 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 152.00 kg.
What does the TDI/GWIY2 variant code on 331158A mean?
Double-row tapered bearings of this size follow SKF works numbering: the base number 331158 fixes the 384.175×546.1×193.675 mm envelope, and the TDI/GWIY2 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 331158A?
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 152.0 kg assembly mass and instrument the first run with temperature logging.
Can components of 331158A 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 331158A as a complete assembly in the same TDI/GWIY2 variant.
How does 331158A react axial load?
The TDI design works as a fixed O arrangement: one double cone between two single cups gives a wide load spread and high moment stiffness while reacting thrust in both directions through the two rows.
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.