BT2B328957 bearing: complete specifications & equivalents
The BT2B328957 is a ANSI ABMA 19.2 radial bearing sized 155 x 200 x 66 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 155 mm |
| Outer diameter D | 200 mm |
| Width B | 66 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 312 kN |
| Basic static load rating C0 | 620 kN |
| Fatigue load limit Pu | 60 kN |
| Operating temperature | -40 to +120 °C |
| Mass | 4850 g |
| Manufacturer designation | SKF BT2B 328957 |
| 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 | 6.102 in |
|---|---|
| Outer diameter D | 7.874 in |
| Width B | 2.598 in |
| ISO bore code | 57 |
| Radial section height (D−d)/2 | 22.5 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) | 2 of 23 |
| Bore above smallest tdo-series size | 53.400000000000006 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| BT2B328957 | 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 BT2B328957 model number is decoded
Material and manufacturing detail: the 4850 g catalogue mass reflects through-hardened bearing steel machined to the listed envelope; ring roundness and width tolerance keep the mounted-setting scatter inside the catalogue class. The TDO/D execution of BT2B328957 differs from sibling variants in internal detail — spacer style, rib execution or clearance class — while sharing the 155×200×66 mm boundary; the full designation including the variant is the only safe order reference. In the TDO X-arrangement the two cones of BT2B328957 locate the shaft in both axial directions; the housing seat for the 200 mm double cup is a loose-to-transition fit so thermal growth does not preload the rows.In SKF catalogue PUB BU/P1 17000, BT2B328957 appears as SKF BT2B 328957: a TDO-design double-row tapered roller bearing for a 155 mm shaft, rated C 312 kN with the factory-set internal clearance of the TDO/D variant.Digit by digit, BT2B328957 breaks into the base number BT2B 328957 — the 155×200×66 mm boundary — and the TDO/D variant code, which is part of the order designation and must be quoted in full at purchase. Lubrication planning: two roller rows inside a 200 mm OD envelope sweep a large contact area per revolution; oil circulation or a defined grease-relubrication interval should be sized against the 4.8 kg assembly mass. 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 4.8 kg mass and the 200 mm OD surface.
Typical equipment & failure modes
Common applications
- large industrial mixer shafts
- offshore winch and drawworks drums
- rolling-mill roll-neck bearings
- offshore winch and drawworks drums
Known failure patterns
- water or scale ingress at the separable ring parting lines in roll-neck service
- 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
- rib-roller contact scoring from loss of the EP additive film
- rolling-contact fatigue spalling after the rated L10 life is exceeded
Selection pitfalls — read before you substitute
- The 155 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 BT2B328957.
- Contamination control matters twice over for double-row units: particles trapped between the rows of BT2B328957 cannot migrate out, so flush the housing before assembly and fit filtration matched to the oil flow.
- Lifting BT2B328957 by one ring separates the assembly; sling through the 155 mm bore or use the shaft as the lifting member.
- The 312/620 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 328957 designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of BT2B328957?
The SKF BT2B 328957 is a double-row tapered roller bearing of TDO design with 155 mm bore, 200 mm outer diameter and 66 mm overall width (6.102 × 7.874 × 2.598 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 312 kN, C0 620 kN, fatigue load limit Pu 60 kN, mass about 4.85 kg.
What does the TDO/D variant code on BT2B328957 mean?
Double-row tapered bearings of this size follow SKF works numbering: the base number BT2B 328957 fixes the 155×200×66 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 BT2B328957?
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 4.8 kg assembly mass and instrument the first run with temperature logging.
Can components of BT2B328957 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 BT2B328957 as a complete assembly in the same TDO/D variant.
How does BT2B328957 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.