331656 bearing: complete specifications & equivalents
The 331656 is a ANSI ABMA 19.2 radial bearing sized 415.925 x 590.55 x 244.475 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 415.925 mm |
| Outer diameter D | 590.55 mm |
| Width B | 244.475 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 4175 kN |
| Basic static load rating C0 | 9650 kN |
| Fatigue load limit Pu | 720 kN |
| Operating temperature | -40 to +120 °C |
| Mass | 205000 g |
| Manufacturer designation | SKF 331656 |
| 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 | 16.375 in |
|---|---|
| Outer diameter D | 23.25 in |
| Width B | 9.625 in |
| ISO bore code | 56 |
| Radial section height (D−d)/2 | 87.3 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) | 22 of 23 |
| Bore above smallest tdo-series size | 314.32500000000005 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 331656 | 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 331656 model number is decoded
TDO mounting: the double cup is clamped in the housing and the two cones take interference on the 415.925 mm shaft; press force goes through the cone faces only — driving through the rollers brinells both raceways at once.SKF 331656 belongs to the SKF TDO double-row range — the 415.925 mm bore entry with a 590.55 mm outside diameter and 244.475 mm overall width, built for roll-neck and heavy-gearbox duty.Reading the designation: 331656 is the SKF double-row base number tied to the 415.925 mm bore and 590.55 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. At 205.0 kg the 331656 assembly needs mechanical handling at mounting — sling through the bore or use lifting eyes on the shaft, and never lift the unit by one ring alone: the rings are separable. Static check: with C0 9650 kN the unit carries shock and standstill load up to the static safety factor of the application; the 720 kN Pu governs the fatigue side of the same calculation. Journal and housing interface: the 415.925 mm bore takes a m6 shaft seat and the 590.55 mm outside diameter pairs with an H7 housing bore; the 244.475 mm width defines shoulder depth and the 205000 g mass is the dead load in thermal-growth calculations. The TDO/XDC execution of 331656 differs from sibling variants in internal detail — spacer style, rib execution or clearance class — while sharing the 415.925×590.55×244.475 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
- brinelling of both raceways when mounting force is transmitted through the roller complement
- axial clamping ring bolt relaxation that lets the clearance-set rows walk apart under reversing thrust
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- edge loading from shaft deflection or housing misalignment
- hard-particle indentation of the tapered raceway in unfiltered oil
Selection pitfalls — read before you substitute
- Do not mix components between units of the same 331656 base number: cones, cups and spacers are matched per serial — interchange only complete assemblies.
- The 415.925 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 331656.
- The 415.925 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 331656.
- The 4175/9650 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 331656 designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of 331656?
The SKF 331656 is a double-row tapered roller bearing of TDO design with 415.925 mm bore, 590.55 mm outer diameter and 244.475 mm overall width (16.375 × 23.25 × 9.625 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4175 kN, C0 9650 kN, fatigue load limit Pu 720 kN, mass about 205.00 kg.
What does the TDO/XDC variant code on 331656 mean?
Double-row tapered bearings of this size follow SKF works numbering: the base number 331656 fixes the 415.925×590.55×244.475 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 331656?
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 205.0 kg assembly mass and instrument the first run with temperature logging.
Can components of 331656 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 331656 as a complete assembly in the same TDO/XDC variant.
How does 331656 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.