BT2B332931 bearing: complete specifications & equivalents
The BT2B332931 is a ANSI ABMA 19.2 radial bearing sized 240 x 480 x 220 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 240 mm |
| Outer diameter D | 480 mm |
| Width B | 220 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 3615 kN |
| Basic static load rating C0 | 5500 kN |
| Fatigue load limit Pu | 465 kN |
| Operating temperature | -40 to +120 °C |
| Mass | 183000 g |
| Manufacturer designation | SKF BT2B 332931 |
| 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 | 9.449 in |
|---|---|
| Outer diameter D | 18.898 in |
| Width B | 8.661 in |
| ISO bore code | 31 |
| Radial section height (D−d)/2 | 120 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) | 2 of 25 |
| Bore above smallest tdi-series size | 36.80000000000001 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| BT2B332931 | 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 BT2B332931 model number is decoded
TDI mounting: the double cone takes the m6 shaft seat at 240 mm bore, and the two single cups are seated separately in the housing — check cup-face contact around the full circumference before axial clamping.SKF BT2B 332931 belongs to the SKF TDI double-row range — the 240 mm bore entry with a 480 mm outside diameter and 220 mm overall width, typical for rolling-mill and heavy industrial shafts.The code SKF BT2B 332931 is not an ISO 355 number: double-row tapered bearings of this size follow SKF works numbering, where BT2B 332931 fixes the 240×480×220 mm envelope and the variant suffix (TDI/WIY2) fixes the internal execution. The 200 mm ring width within the 220 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. Selection arithmetic: C 3615 kN and C0 5500 kN are ratings of the complete double-row unit, giving a C0/C balance of 1.52; the fatigue load limit Pu 465 kN is the floor for the adjusted-life calculation at the 240 mm bore. Dimensional interchange map: within its boundary plan the 240×480×220 mm envelope of BT2B332931 is fixed, so shoulder, spacer and seal drawings can be dimensioned straight from the catalogue table. When cross-referencing BT2B332931, note that the TDI/WIY2 variant is part of the SKF works designation: same-envelope units under another variant code can differ in clearance class and load rating even though d/D/T match.
Typical equipment & failure modes
Common applications
- large industrial mixer shafts
- offshore winch and drawworks drums
- rolling-mill roll-neck bearings
- wind-turbine main shafts
Known failure patterns
- brinelling of both raceways when mounting force is transmitted through the roller complement
- water or scale ingress at the separable ring parting lines in roll-neck service
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- fretting corrosion on a loose rotating shaft seat
- electrical pitting on VFD-driven shafts without grounding protection
Selection pitfalls — read before you substitute
- The 240 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 BT2B332931.
- Contamination control matters twice over for double-row units: particles trapped between the rows of BT2B332931 cannot migrate out, so flush the housing before assembly and fit filtration matched to the oil flow.
- Do not mix components between units of the same BT2B 332931 base number: cones, cups and spacers are matched per serial — interchange only complete assemblies.
- The 3615/5500 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 BT2B 332931 designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of BT2B332931?
The SKF BT2B 332931 is a double-row tapered roller bearing of TDI design with 240 mm bore, 480 mm outer diameter and 220 mm overall width (9.449 × 18.898 × 8.661 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3615 kN, C0 5500 kN, fatigue load limit Pu 465 kN, mass about 183.00 kg.
What does the TDI/WIY2 variant code on BT2B332931 mean?
Double-row tapered bearings of this size follow SKF works numbering: the base number BT2B 332931 fixes the 240×480×220 mm envelope, and the TDI/WIY2 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 BT2B332931?
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 183.0 kg assembly mass and instrument the first run with temperature logging.
Can components of BT2B332931 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 BT2B332931 as a complete assembly in the same TDI/WIY2 variant.
How does BT2B332931 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.