BT2B328874-HA1 bearing: complete specifications & equivalents
The BT2B328874-HA1 is a ANSI ABMA 19.2 radial bearing sized 408.4 x 546.1 x 120 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 408.4 mm |
| Outer diameter D | 546.1 mm |
| Width B | 120 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 1603 kN |
| Basic static load rating C0 | 3450 kN |
| Fatigue load limit Pu | 285 kN |
| Operating temperature | -40 to +120 °C |
| Mass | 76500 g |
| Manufacturer designation | SKF BT2B 328874/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 | 16.079 in |
|---|---|
| Outer diameter D | 21.5 in |
| Width B | 4.724 in |
| ISO bore code | 74 |
| Radial section height (D−d)/2 | 68.9 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) | 21 of 25 |
| Bore above smallest tdi-series size | 205.2 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| BT2B328874 | 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 BT2B328874-HA1 model number is decoded
Clearance note for BT2B328874-HA1: the operating clearance is set at the factory by spacer grinding between the two rows; the TDI/Y2 variant encodes that setting, so the unit mounts without any adjustment — the assembler only verifies seat contact and clamps axially. Dividing C 1603 kN by the 408.4 mm bore gives 3.93 kN per millimetre of journal — heavy-section density typical of double-row tapered units built for slow, heavily loaded shafts. Assembly datum check: verify the 120 mm width against the drawing before clamping — the width is the assembled result and the quickest field check that the correct execution of BT2B328874-HA1 is on the shaft. The TDI/Y2 suffix on BT2B328874-HA1 is a design-variant code in the SKF double-row numbering system; it identifies which internal configuration sits inside the 408.4×546.1×120 mm envelope. TDI mounting: the double cone takes the m6 shaft seat at 408.4 mm bore, and the two single cups are seated separately in the housing — check cup-face contact around the full circumference before axial clamping.In SKF catalogue PUB BU/P1 17000, BT2B328874-HA1 appears as SKF BT2B 328874/HA1: a TDI-design double-row tapered roller bearing for a 408.4 mm shaft, rated C 1603 kN in the TDI/Y2 execution.Digit by digit, BT2B328874-HA1 breaks into the base number BT2B 328874 — the 408.4×546.1×120 mm boundary — and the TDI/Y2 variant code, which is part of the order designation and must be quoted in full at purchase.
Typical equipment & failure modes
Common applications
- large crusher and mineral-processing drives
- wind-turbine main shafts
- marine propulsion gearboxes
- offshore winch and drawworks drums
Known failure patterns
- water or scale ingress at the separable ring parting lines in roll-neck service
- 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
- grease degradation after long shelf storage without rotation or re-greasing
- rolling-contact fatigue spalling after the rated L10 life is exceeded
Selection pitfalls — read before you substitute
- Lifting BT2B328874-HA1 by one ring separates the assembly; sling through the 408.4 mm bore or use the shaft as the lifting member.
- The 408.4 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 BT2B328874-HA1.
- Lifting BT2B328874-HA1 by one ring separates the assembly; sling through the 408.4 mm bore or use the shaft as the lifting member.
- The 1603/3450 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 328874/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 BT2B328874-HA1?
The SKF BT2B 328874/HA1 is a double-row tapered roller bearing of TDI design with 408.4 mm bore, 546.1 mm outer diameter and 120 mm overall width (16.079 × 21.5 × 4.724 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1603 kN, C0 3450 kN, fatigue load limit Pu 285 kN, mass about 76.50 kg.
What does the TDI/Y2 variant code on BT2B328874-HA1 mean?
Double-row tapered bearings of this size follow SKF works numbering: the base number BT2B 328874 fixes the 408.4×546.1×120 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 BT2B328874-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 76.5 kg assembly mass and instrument the first run with temperature logging.
Can components of BT2B328874-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 BT2B328874-HA1 as a complete assembly in the same TDI/Y2 variant.
How does BT2B328874-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.