25572-25520 bearing: complete specifications & equivalents
The 25572-25520 is a ISO 355 radial bearing sized 38.1 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 | 38.1 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 | 650 g |
| Manufacturer designation | SKF 25572/25520 |
| 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 | 1.5 in |
|---|---|
| Outer diameter D | 3.265 in |
| Width B | 0.937 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 22.4 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) | 1 of 4 |
| Bore above smallest 25500-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 25572-25520-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 38.1×82.931×23.812 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 25572-25520 | 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 25572-25520 model number is decoded
A single-row inch tapered bearing is quoted as a cone/cup pair because the boundary dimensions belong to the combination, not to either half alone: in 25572 the 25572 cone contributes the 38.1 mm bore and roller set, the 25520 cup contributes the 82.931 mm OD raceway, and the assembled 23.812 mm width is the catalogue value.SKF 25572 (SKF 25572/25520) is the 25500-series tapered roller choice for a 38.1 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 82.931×23.812 mm envelope.On the SKF nameplate, 25572 denotes a matched cone-and-cup pair: the designation is not a single number but a cone reference and cup reference joined by a slash, with the 25500-series marking the dimensional series. 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. With C 99.1 kN and C0 106 kN, the 25572 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 8,000 r/min. Mounting practice for 25572: the rotating cone takes the interference fit (k5 on a 38.1 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing. Operating context for the 38.1 mm bore: a shaft of this diameter in the medium-bore band typically runs between 30480 and 45720 r/min in real machinery, and the 82.931 mm outside diameter places the housing shoulder at 91 mm outer abutment; the 23.812 mm width and 650 g mass together set the shaft critical speed and the housing resonance check for this 25500-series envelope.
Typical equipment & failure modes
Common applications
- machine-tool spindles
- belt-driven fan and blower shafts
- axle-boxes in material-handling equipment
- differential and pinion drives
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
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- On this 38.1 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 25572 pair heats, loses setting control and smears the roller-rib contact.
- The 25500-series inch series at 38.1 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.
- The tapered contact angle creates an induced axial load under pure radial force; include it in the 25572 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
- 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 25572 mounting error.
- Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 82.931 mm cup race release as noise within the first running hours.
- 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 25572 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 25572/25520 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
Is 25572 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 25572?
The SKF 25572/25520 is a single-row tapered roller bearing with 38.1 mm bore, 82.931 mm outer diameter and 23.812 mm width (1.5 × 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 650 g. It is an open, separable bearing with a pressed-steel cage.
How does the 25572 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 38.1×82.931×23.812 mm are the converted equivalents of the original inch boundary dimensions.
What do the cone and cup numbers in 25572 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 25572 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.