617479B bearing: complete specifications & equivalents
The 617479B is a ANSI ABMA 19.2 radial bearing sized 260 x 440 x 144 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 260 mm |
| Outer diameter D | 440 mm |
| Width B | 144 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 1994 kN |
| Basic static load rating C0 | 3450 kN |
| Fatigue load limit Pu | 305 kN |
| Operating temperature | -40 to +120 °C |
| Mass | 86500 g |
| Manufacturer designation | SKF 617479 B |
| 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 | 10.236 in |
|---|---|
| Outer diameter D | 17.323 in |
| Width B | 5.669 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 90 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) | 5 of 23 |
| Bore above smallest tdo-series size | 158.4 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 617479B | 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 617479B model number is decoded
In the TDO X-arrangement the two cones of 617479B locate the shaft in both axial directions; the housing seat for the 440 mm double cup is a loose-to-transition fit so thermal growth does not preload the rows.617479B is a double-row tapered roller bearing of the TDO design, listed by SKF in SKF catalogue PUB BU/P1 17000: one double cup and two cones in a fixed X arrangement with the axial clearance set at the factory — a ready-to-mount unit for heavy combined load.Reading the designation: 617479 is the SKF double-row base number tied to the 260 mm bore and 440 mm OD, and the TDO/XDC suffix identifies the internal design variant — cup/cone configuration, spacer execution and clearance class are encoded there rather than in a generic suffix. Wear pattern reading at overhaul: the two rows of 617479B should show symmetric raceway contact; one-sided wear points to housing misalignment or a cocked seat rather than to a material defect. Static check: with C0 3450 kN the unit carries shock and standstill load up to the static safety factor of the application; the 305 kN Pu governs the fatigue side of the same calculation. Journal and housing interface: the 260 mm bore takes a m6 shaft seat and the 440 mm outside diameter pairs with an H7 housing bore; the 144 mm width defines shoulder depth and the 86500 g mass is the dead load in thermal-growth calculations. The TDO/XDC execution of 617479B differs from sibling variants in internal detail — spacer style, rib execution or clearance class — while sharing the 260×440×144 mm boundary; the full designation including the variant is the only safe order reference.
Typical equipment & failure modes
Common applications
- large crusher and mineral-processing drives
- wind-turbine main shafts
- marine propulsion gearboxes
- rolling-mill roll-neck bearings
Known failure patterns
- unequal load sharing between the two roller rows when the centre spacer loses its factory grinding
- water or scale ingress at the separable ring parting lines in roll-neck service
- 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 617479B installation with temperature logging.
- The 260 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 617479B.
- The 260 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 617479B.
- The 1994/3450 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 617479 B designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of 617479B?
The SKF 617479 B is a double-row tapered roller bearing of TDO design with 260 mm bore, 440 mm outer diameter and 144 mm overall width (10.236 × 17.323 × 5.669 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1994 kN, C0 3450 kN, fatigue load limit Pu 305 kN, mass about 86.50 kg.
What does the TDO/XDC variant code on 617479B mean?
Double-row tapered bearings of this size follow SKF works numbering: the base number 617479 fixes the 260×440×144 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 617479B?
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 86.5 kg assembly mass and instrument the first run with temperature logging.
Can components of 617479B 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 617479B as a complete assembly in the same TDO/XDC variant.
How does 617479B 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.