BT2B331840C-HA1 bearing: complete specifications & equivalents
The BT2B331840C-HA1 is a ANSI ABMA 19.2 radial bearing sized 406.4 x 546.1 x 138.113 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 | 546.1 mm |
| Width B | 138.113 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 2339 kN |
| Basic static load rating C0 | 5100 kN |
| Fatigue load limit Pu | 405 kN |
| Operating temperature | -40 to +120 °C |
| Mass | 89000 g |
| Manufacturer designation | SKF BT2B 331840 C/HA1 |
| 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 in |
|---|---|
| Outer diameter D | 21.5 in |
| Width B | 5.438 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 69.9 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) | 20 of 25 |
| Bore above smallest tdi-series size | 203.2 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| BT2B331840C | 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 BT2B331840C-HA1 model number is decoded
Load sharing between the two rows of BT2B331840C-HA1 depends on the ground spacer; field re-grinding or mixing spacers from another unit — even of the same BT2B 331840 base — destroys the factory setting. 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 89.0 kg mass and the 546.1 mm OD surface. Assembly datum check: verify the 138.113 mm width against the drawing before clamping — the width is the assembled result and the quickest field check that the correct execution of BT2B331840C-HA1 is on the shaft. The TDI/WIY2 execution of BT2B331840C-HA1 differs from sibling variants in internal detail — spacer style, rib execution or clearance class — while sharing the 406.4×546.1×138.113 mm boundary; the full designation including the variant is the only safe order reference. TDI mounting: the double cone takes the m6 shaft seat at 406.4 mm bore, and the two single cups are seated separately in the housing — check cup-face contact around the full circumference before axial clamping.Ordering number SKF BT2B 331840 C/HA1 in SKF catalogue PUB BU/P1 17000 denotes a TDI double-row tapered roller bearing for a 406.4 mm shaft: double cone, two single cups, factory-set internal clearance in the TDI/WIY2 variant.Digit by digit, BT2B331840C-HA1 breaks into the base number BT2B 331840 — the 406.4×546.1×138.113 mm boundary — and the TDI/WIY2 variant code, which is part of the order designation and must be quoted in full at purchase.
Typical equipment & failure modes
Common applications
- wind-turbine main shafts
- marine propulsion gearboxes
- large industrial mixer shafts
- rolling-mill roll-neck bearings
Known failure patterns
- thermal clearance loss when housing cooling is undersized for two rows of tapered contact
- 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
- 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
- Contamination control matters twice over for double-row units: particles trapped between the rows of BT2B331840C-HA1 cannot migrate out, so flush the housing before assembly and fit filtration matched to the oil flow.
- 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 BT2B331840C-HA1.
- 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 BT2B331840C-HA1.
- The 2339/5100 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 331840 C/HA1 designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of BT2B331840C-HA1?
The SKF BT2B 331840 C/HA1 is a double-row tapered roller bearing of TDI design with 406.4 mm bore, 546.1 mm outer diameter and 138.113 mm overall width (16 × 21.5 × 5.438 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2339 kN, C0 5100 kN, fatigue load limit Pu 405 kN, mass about 89.00 kg.
What does the TDI/WIY2 variant code on BT2B331840C-HA1 mean?
Double-row tapered bearings of this size follow SKF works numbering: the base number BT2B 331840 fixes the 406.4×546.1×138.113 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 BT2B331840C-HA1?
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 89.0 kg assembly mass and instrument the first run with temperature logging.
Can components of BT2B331840C-HA1 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 BT2B331840C-HA1 as a complete assembly in the same TDI/WIY2 variant.
How does BT2B331840C-HA1 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.