BT2B331782 bearing: complete specifications & equivalents
The BT2B331782 is a ANSI ABMA 19.2 radial bearing sized 254 x 422.275 x 178.592 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 254 mm |
| Outer diameter D | 422.275 mm |
| Width B | 178.592 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 2393 kN |
| Basic static load rating C0 | 4050 kN |
| Fatigue load limit Pu | 355 kN |
| Operating temperature | -40 to +120 °C |
| Mass | 97500 g |
| Manufacturer designation | SKF BT2B 331782 |
| 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 | 10 in |
|---|---|
| Outer diameter D | 16.625 in |
| Width B | 7.031 in |
| ISO bore code | 82 |
| Radial section height (D−d)/2 | 84.1 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) | 4 of 23 |
| Bore above smallest tdo-series size | 152.4 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| BT2B331782 | 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 BT2B331782 model number is decoded
Numbering for double-row tapered bearings is works-specific: BT2B 331782 denotes the envelope (254 mm bore, 422.275 mm OD, 178.592 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. The 139.7 mm ring width within the 178.592 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. The catalogue publishes no speed ratings for this size class — permissible speed is set by the application thermal balance; plan lubrication and cooling against the 97.5 kg mass and the 422.275 mm OD surface. Cross-section geometry: the 84.1 mm half-section ((422.275−254)/2) places the roller pitch diameter near 338 mm, and the 178.592 mm axial width sets the abutment depth — geometry that fixes the contact angle behaviour of BT2B331782. Ordering discipline for BT2B331782: quote base number and TDO/D variant together — the base alone is ambiguous because several internal executions share the same 254 mm bore boundary. TDO mounting: the double cup is clamped in the housing and the two cones take interference on the 254 mm shaft; press force goes through the cone faces only — driving through the rollers brinells both raceways at once.Ordering number SKF BT2B 331782 in SKF catalogue PUB BU/P1 17000 denotes a TDO double-row tapered roller bearing for a 254 mm shaft: one double cup, two cone assemblies, spacers ground for a fixed operating clearance.
Typical equipment & failure modes
Common applications
- large industrial mixer shafts
- offshore winch and drawworks drums
- rolling-mill roll-neck bearings
- rolling-mill roll-neck bearings
Known failure patterns
- thermal clearance loss when housing cooling is undersized for two rows of tapered contact
- 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
- rolling-contact fatigue spalling after the rated L10 life is exceeded
- mounting score marks when the cone is cocked over the shaft keyway or a burr
Selection pitfalls — read before you substitute
- The 254 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 BT2B331782.
- Lifting BT2B331782 by one ring separates the assembly; sling through the 254 mm bore or use the shaft as the lifting member.
- Lifting BT2B331782 by one ring separates the assembly; sling through the 254 mm bore or use the shaft as the lifting member.
- The 2393/4050 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 331782 designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of BT2B331782?
The SKF BT2B 331782 is a double-row tapered roller bearing of TDO design with 254 mm bore, 422.275 mm outer diameter and 178.592 mm overall width (10 × 16.625 × 7.031 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2393 kN, C0 4050 kN, fatigue load limit Pu 355 kN, mass about 97.50 kg.
What does the TDO/D variant code on BT2B331782 mean?
Double-row tapered bearings of this size follow SKF works numbering: the base number BT2B 331782 fixes the 254×422.275×178.592 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 BT2B331782?
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 97.5 kg assembly mass and instrument the first run with temperature logging.
Can components of BT2B331782 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 BT2B331782 as a complete assembly in the same TDO/D variant.
How does BT2B331782 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.