BT2B331837 bearing: complete specifications & equivalents
The BT2B331837 is a ANSI ABMA 19.2 radial bearing sized 384.175 x 546.1 x 193.675 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 384.175 mm |
| Outer diameter D | 546.1 mm |
| Width B | 193.675 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 3724 kN |
| Basic static load rating C0 | 8300 kN |
| Fatigue load limit Pu | 640 kN |
| Operating temperature | -40 to +120 °C |
| Mass | 152000 g |
| Manufacturer designation | SKF BT2B 331837 |
| 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 | 15.125 in |
|---|---|
| Outer diameter D | 21.5 in |
| Width B | 7.625 in |
| ISO bore code | 37 |
| Radial section height (D−d)/2 | 81 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) | 17 of 25 |
| Bore above smallest tdi-series size | 180.97500000000002 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| BT2B331837 | 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 BT2B331837 model number is decoded
Cross-section geometry: the 81.0 mm half-section ((546.1−384.175)/2) places the roller pitch diameter near 465 mm, and the 193.675 mm axial width sets the abutment depth — geometry that fixes the contact angle behaviour of BT2B331837. The TDI/Y2 execution of BT2B331837 differs from sibling variants in internal detail — spacer style, rib execution or clearance class — while sharing the 384.175×546.1×193.675 mm boundary; the full designation including the variant is the only safe order reference. In the TDI O-arrangement the spread of the two rows of BT2B331837 gives high moment stiffness; the cups must be free to float microscopically in the housing so shaft thermal growth does not consume the factory clearance.SKF BT2B 331837 belongs to the SKF TDI double-row range — the 384.175 mm bore entry with a 546.1 mm outside diameter and 193.675 mm overall width, typical for rolling-mill and heavy industrial shafts.On the SKF nameplate, BT2B331837 reads as base BT2B 331837 in the TDI/Y2 design variant; boundary dimensions 384.175×546.1×193.675 mm come from the base number, while clearance setting and spacer style come from the variant. Load sharing between the two rows of BT2B331837 depends on the ground spacer; field re-grinding or mixing spacers from another unit — even of the same BT2B 331837 base — destroys the factory setting. Dividing C 3724 kN by the 384.175 mm bore gives 9.69 kN per millimetre of journal — heavy-section density typical of double-row tapered units built for slow, heavily loaded shafts.
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
- brinelling of both raceways when mounting force is transmitted through the roller complement
- thermal clearance loss when housing cooling is undersized for two rows of tapered contact
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- fretting corrosion on a loose rotating shaft seat
- hard-particle indentation of the tapered raceway in unfiltered oil
Selection pitfalls — read before you substitute
- Lifting BT2B331837 by one ring separates the assembly; sling through the 384.175 mm bore or use the shaft as the lifting member.
- Lifting BT2B331837 by one ring separates the assembly; sling through the 384.175 mm bore or use the shaft as the lifting member.
- Never adjust the clearance of BT2B331837 in the field: the two rows are set by ground spacers at the factory, and shim experiments on a 152.0 kg assembly usually end in overheated rows.
- The 3724/8300 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 331837 designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of BT2B331837?
The SKF BT2B 331837 is a double-row tapered roller bearing of TDI design with 384.175 mm bore, 546.1 mm outer diameter and 193.675 mm overall width (15.125 × 21.5 × 7.625 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3724 kN, C0 8300 kN, fatigue load limit Pu 640 kN, mass about 152.00 kg.
What does the TDI/Y2 variant code on BT2B331837 mean?
Double-row tapered bearings of this size follow SKF works numbering: the base number BT2B 331837 fixes the 384.175×546.1×193.675 mm envelope, and the TDI/Y2 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 BT2B331837?
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 152.0 kg assembly mass and instrument the first run with temperature logging.
Can components of BT2B331837 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 BT2B331837 as a complete assembly in the same TDI/Y2 variant.
How does BT2B331837 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.