BT2B328389 bearing: complete specifications & equivalents
The BT2B328389 is a ANSI ABMA 19.2 radial bearing sized 406.4 x 539.75 x 142.875 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 406.4 mm |
| Outer diameter D | 539.75 mm |
| Width B | 142.875 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 1817 kN |
| Basic static load rating C0 | 4400 kN |
| Fatigue load limit Pu | 345 kN |
| Operating temperature | -40 to +120 °C |
| Mass | 82500 g |
| Manufacturer designation | SKF BT2B 328389 |
| 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 | 16 in |
|---|---|
| Outer diameter D | 21.25 in |
| Width B | 5.625 in |
| ISO bore code | 89 |
| Radial section height (D−d)/2 | 66.7 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) | 21 of 23 |
| Bore above smallest tdo-series size | 304.79999999999995 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| BT2B328389 | 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 BT2B328389 model number is decoded
TDO mounting: the double cup is clamped in the housing and the two cones take interference on the 406.4 mm shaft; press force goes through the cone faces only — driving through the rollers brinells both raceways at once.In SKF catalogue PUB BU/P1 17000, BT2B328389 appears as SKF BT2B 328389: a TDO-design double-row tapered roller bearing for a 406.4 mm shaft, rated C 1817 kN with the factory-set internal clearance of the TDO/XDC variant.The code SKF BT2B 328389 is not an ISO 355 number: double-row tapered bearings of this size follow SKF works numbering, where BT2B 328389 fixes the 406.4×539.75×142.875 mm envelope and the variant suffix (TDO/XDC) fixes the internal execution. At 82.5 kg the BT2B328389 assembly needs mechanical handling at mounting — sling through the bore or use lifting eyes on the shaft, and never lift the unit by one ring alone: the rings are separable. Dividing C 1817 kN by the 406.4 mm bore gives 4.47 kN per millimetre of journal — heavy-section density typical of double-row tapered units built for slow, heavily loaded shafts. Load system: C 1817 kN against C0 4400 kN gives a 2.42 balance, and 4.47 kN of dynamic capacity per millimetre of the 406.4 mm bore is the density figure to compare against neighbouring sizes. Service-parts note: a worn BT2B328389 must be replaced by the same TDO/XDC variant or by a works-approved successor — the variant encodes the spacer grinding that sets the operating clearance of the two rows.
Typical equipment & failure modes
Common applications
- wind-turbine main shafts
- marine propulsion gearboxes
- large industrial mixer shafts
- heavy-duty rolling-mill gearboxes
Known failure patterns
- water or scale ingress at the separable ring parting lines in roll-neck service
- brinelling of both raceways when mounting force is transmitted through the roller complement
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- brinelling from pressing the cone or cup home through the rollers
- brinelling from pressing the cone or cup home through the rollers
Selection pitfalls — read before you substitute
- Catalogue tables for this size class list no reference speed: derive permissible speed from the application heat balance, and instrument the first run of a BT2B328389 installation with temperature logging.
- The 406.4 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 BT2B328389.
- Catalogue tables for this size class list no reference speed: derive permissible speed from the application heat balance, and instrument the first run of a BT2B328389 installation with temperature logging.
- The 1817/4400 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 328389 designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of BT2B328389?
The SKF BT2B 328389 is a double-row tapered roller bearing of TDO design with 406.4 mm bore, 539.75 mm outer diameter and 142.875 mm overall width (16 × 21.25 × 5.625 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1817 kN, C0 4400 kN, fatigue load limit Pu 345 kN, mass about 82.50 kg.
What does the TDO/XDC variant code on BT2B328389 mean?
Double-row tapered bearings of this size follow SKF works numbering: the base number BT2B 328389 fixes the 406.4×539.75×142.875 mm envelope, and the TDO/XDC 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 BT2B328389?
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 82.5 kg assembly mass and instrument the first run with temperature logging.
Can components of BT2B328389 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 BT2B328389 as a complete assembly in the same TDO/XDC variant.
How does BT2B328389 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.