331445 bearing: complete specifications & equivalents
The 331445 is a ANSI ABMA 19.2 radial bearing sized 415.925 x 590.55 x 209.55 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 415.925 mm |
| Outer diameter D | 590.55 mm |
| Width B | 209.55 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 4175 kN |
| Basic static load rating C0 | 9650 kN |
| Fatigue load limit Pu | 720 kN |
| Operating temperature | -40 to +120 °C |
| Mass | 192000 g |
| Manufacturer designation | SKF 331445 |
| 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 | 16.375 in |
|---|---|
| Outer diameter D | 23.25 in |
| Width B | 8.25 in |
| ISO bore code | 45 |
| Radial section height (D−d)/2 | 87.3 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) | 23 of 25 |
| Bore above smallest tdi-series size | 212.72500000000002 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 331445 | 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 331445 model number is decoded
The SKF 331445 is a 415.925×590.55×209.55 mm TDI double-row tapered roller bearing — a double cone with two cups, delivered clearance-set as one assembly weighing 192.0 kg.The code SKF 331445 is not an ISO 355 number: double-row tapered bearings of this size follow SKF works numbering, where 331445 fixes the 415.925×590.55×209.55 mm envelope and the variant suffix (TDI/GWIY2) fixes the internal execution. The 209.55 mm ring width within the 209.55 mm overall width is the space taken by the centre element of the set; abutment and spacer drawings should be dimensioned from the catalogue width table, not scaled from a single-row bearing. Dividing C 4175 kN by the 415.925 mm bore gives 10.04 kN per millimetre of journal — heavy-section density typical of double-row tapered units built for slow, heavily loaded shafts. Journal and housing interface: the 415.925 mm bore takes a m6 shaft seat and the 590.55 mm outside diameter pairs with an H7 housing bore; the 209.55 mm width defines shoulder depth and the 192000 g mass is the dead load in thermal-growth calculations. Service-parts note: a worn 331445 must be replaced by the same TDI/GWIY2 variant or by a works-approved successor — the variant encodes the spacer grinding that sets the operating clearance of the two rows. TDI mounting: the double cone takes the m6 shaft seat at 415.925 mm bore, and the two single cups are seated separately in the housing — check cup-face contact around the full circumference before axial clamping.
Typical equipment & failure modes
Common applications
- marine propulsion gearboxes
- large industrial mixer shafts
- offshore winch and drawworks drums
- marine propulsion gearboxes
Known failure patterns
- axial clamping ring bolt relaxation that lets the clearance-set rows walk apart under reversing thrust
- axial clamping ring bolt relaxation that lets the clearance-set rows walk apart under reversing thrust
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- hard-particle indentation of the tapered raceway in unfiltered oil
- rib-roller contact scoring from loss of the EP additive film
Selection pitfalls — read before you substitute
- Never adjust the clearance of 331445 in the field: the two rows are set by ground spacers at the factory, and shim experiments on a 192.0 kg assembly usually end in overheated rows.
- The 415.925 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 331445.
- Contamination control matters twice over for double-row units: particles trapped between the rows of 331445 cannot migrate out, so flush the housing before assembly and fit filtration matched to the oil flow.
- The 4175/9650 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 331445 designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of 331445?
The SKF 331445 is a double-row tapered roller bearing of TDI design with 415.925 mm bore, 590.55 mm outer diameter and 209.55 mm overall width (16.375 × 23.25 × 8.25 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4175 kN, C0 9650 kN, fatigue load limit Pu 720 kN, mass about 192.00 kg.
What does the TDI/GWIY2 variant code on 331445 mean?
Double-row tapered bearings of this size follow SKF works numbering: the base number 331445 fixes the 415.925×590.55×209.55 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 331445?
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 192.0 kg assembly mass and instrument the first run with temperature logging.
Can components of 331445 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 331445 as a complete assembly in the same TDI/GWIY2 variant.
How does 331445 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.