25590-25520 bearing: complete specifications & equivalents
The 25590-25520 is a ISO 355 radial bearing sized 45.618 x 82.931 x 23.812 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 45.618 mm |
| Outer diameter D | 82.931 mm |
| Width B | 23.812 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 99.1 kN |
| Basic static load rating C0 | 106 kN |
| Fatigue load limit Pu | 11.8 kN |
| Reference speed (thermal) | 6700 rpm |
| Limiting speed (mechanical) | 8000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 550 g |
| Manufacturer designation | SKF 25590/25520 |
| Standard | ISO 355 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB |
| Last verified | 2026-09-28 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB) · extracted 2026-09-28
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB); 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 & 25500-series range
| Bore d | 1.796 in |
|---|---|
| Outer diameter D | 3.265 in |
| Width B | 0.937 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 18.7 mm |
| Smallest bore in 25500-series | 38.1 mm |
| Largest outer diameter in 25500-series | 83.058 mm |
| Width range across 25500-series | 23.812–26.988 mm |
| Bore position in 25500-series (smallest first) | 4 of 4 |
| Bore above smallest 25500-series size | 7.518000000000001 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 25590-25519 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45.618×82.931×23.812 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 25590-25520-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45.618×82.931×23.812 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 25590-25522-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45.618×82.931×23.812 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 25590-25526 | NTN | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue. |
| 25590-25520 | Timken | full Dimensions and internal design equivalent — standard interchange. | Same inch-series cone/cup boundary envelope (d/D/T); load ratings and speed limits are brand-specific and may differ. |
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 25590-25520 model number is decoded
Within the 25500-series tables, 25590 appears in several rows because SKF lists multiple cup options for the same cone. 25590 is the 25520 variant, with 82.931 mm OD and 23.812 mm width; neighbouring rows on the same cone differ only in the cup but are separate orderable bearings.In SKF catalogue PUB BU/P1 17000, 25590 appears as SKF 25590/25520: an open, single-row tapered roller bearing in the 25500-series, supplied with a pressed-steel cage as standard.Numbering ties the bearing to its inch-series envelope: 25590 means a cone and cup matched pair in the 25500-series series — which is why the 45.618×82.931×23.812 mm outline swaps dimensionally with other inch-series bearings of the same code. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. ); it is the dimensional series, not a separate part number. Speed planning uses two different ceilings: 6,700 r/min thermal reference and 8,000 r/min mechanical limiting speed. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 25590 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting. Speed envelope and thermal behaviour: at 6,700 r/min thermal reference, the 45.618 mm bore shaft runs at a dn of 306k, and the 18.7 mm section dissipates heat through the cup-to-housing contact path; the 8,000 r/min mechanical ceiling reflects cage strength, and the 550 g spinning cone contributes gyroscopic moment under rapid speed reversal.
Typical equipment & failure modes
Common applications
- differential and pinion drives
- pump and compressor shafts
- machine-tool spindles
- automotive and light-truck wheel hubs
Known failure patterns
- cup or cone misalignment when the separable rings are not seated square during mounting
- loose cup rotation in the housing when the specified press fit is not achieved
- false brinelling on idle paired sets exposed to machine vibration
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- rolling-contact fatigue spalling after the rated L10 life is exceeded
Selection pitfalls — read before you substitute
- On this 45.618 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 25590 pair heats, loses setting control and smears the roller-rib contact.
- The 25500-series inch series at 45.618 mm bore (82.931×23.812 mm) follows the Timken cone/cup convention; substitutions must match both the cone and cup reference exactly — interchanging with another series or a metric 3xxxx bearing of the same bore changes OD, width and contact angle, so re-run the pair setting and shoulder-diameter checks before swapping.
- A single 25590 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.
- O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 25590 mounting error.
- The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.
- The 99.1/106 kN ratings are SKF catalogue 17000 values for the basic 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 and re-verify for critical drives.
- SKF lists several executions of 25590 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 25590/25520 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
Is 25590 interchangeable with other brands?
Inch-series tapered roller bearings follow a long-standing industry boundary plan, so cones and cups of the same basic number are generally dimensionally interchangeable across manufacturers. However, internal geometry, cage design and load ratings differ by brand, so for paired or precision applications keep both halves of the set from one manufacturer — or re-verify ratings and setting when mixing.
What are the dimensions and catalogue data of 25590?
The SKF 25590/25520 is a single-row tapered roller bearing with 45.618 mm bore, 82.931 mm outer diameter and 23.812 mm width (1.796 × 3.265 × 0.937 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 99.1 kN, C0 106 kN, fatigue load limit Pu 11.8 kN, reference speed 6,700 r/min, limiting speed 8,000 r/min, mass about 550 g. It is an open, separable bearing with a pressed-steel cage.
How does the 25590 inch-series designation work?
Inch-series tapered roller bearings use a Timken-style cone/cup convention: the number before the slash identifies the cone (inner ring with roller and cage assembly), the number after the slash identifies the cup (outer ring), and the 25500-series code marks the dimensional series. The metric dimensions 45.618×82.931×23.812 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in 25590 mean?
The cone number (before the slash) identifies the inner ring, rollers and cage; the cup number (after the slash) identifies the outer ring. Both are quoted together because a single-row tapered roller bearing is a matched separable pair — the cone and cup are ground to work together and are not interchangeable with arbitrary other parts. The series prefix (25500-series) groups sizes that share the same boundary-dimension plan.
Can a single 25590 take axial load in both directions?
No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB on 2026-09-28. Read our editorial & correction policy.