25880-25820 bearing: complete specifications & equivalents
The 25880-25820 is a ISO 355 radial bearing sized 36.487 x 73.025 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 | 36.487 mm |
| Outer diameter D | 73.025 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 | 89.1 kN |
| Basic static load rating C0 | 88 kN |
| Fatigue load limit Pu | 9.8 kN |
| Reference speed (thermal) | 8000 rpm |
| Limiting speed (mechanical) | 9500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 460 g |
| Manufacturer designation | SKF 25880/25820 |
| 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 & 25800-series range
| Bore d | 1.436 in |
|---|---|
| Outer diameter D | 2.875 in |
| Width B | 0.937 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 18.3 mm |
| Smallest bore in 25800-series | 34.925 mm |
| Largest outer diameter in 25800-series | 73.025 mm |
| Width range across 25800-series | 23.812–23.812 mm |
| Bore position in 25800-series (smallest first) | 2 of 2 |
| Bore above smallest 25800-series size | 1.5620000000000047 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 25880-25821 | 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. |
| 25880-25820 | 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 25880-25820 model number is decoded
Specify pairs rather than single units wherever thrust reverses: the tapered contact of 25880 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat. Speed envelope and thermal behaviour: at 8,000 r/min thermal reference, the 36.487 mm bore shaft runs at a dn of 292k, and the 18.3 mm section dissipates heat through the cup-to-housing contact path; the 9,500 r/min mechanical ceiling reflects cage strength, and the 460 g spinning cone contributes gyroscopic moment under rapid speed reversal. Cup-side note for 25820: the outer ring's rib profile and the 73.025 mm outside diameter are cup-specific within the 25800-series tables, so substituting a different cup against the same 25880 cone changes both the assembled 23.812 mm width and the axial free-play setting of the mounted pair.SKF 25880/25820 belongs to the SKF single-row tapered roller range — the 36.487 mm bore entry in the inch 25800-series, dimensioned 73.025 mm OD and 23.812 mm wide.In SKF inch-series tables 25880 sits at 36.487 mm bore (1.436 in) with a 73.025 mm cup OD and 23.812 mm total width — dimensions that trace back to the original Timken boundary plan for the 25800-series family. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. At 8,000 r/min reference speed the 18.3 mm-section 25880 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 9,500 r/min as the mechanical ceiling.
Typical equipment & failure modes
Common applications
- differential and pinion drives
- pump and compressor shafts
- machine-tool spindles
- pump and compressor shafts
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
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- rolling-contact fatigue spalling after the rated L10 life is exceeded
Selection pitfalls — read before you substitute
- On this 36.487 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 25880 pair heats, loses setting control and smears the roller-rib contact.
- The 25800-series inch series at 36.487 mm bore (73.025×23.812 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 25880 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
- The tapered contact angle creates an induced axial load under pure radial force; include it in the 25880 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
- Catalogue reference speed and limiting speed are different limits: the 8,000 r/min reference is a thermal criterion under load, while the 9,500 r/min limiting value is the mechanical ceiling — observe both.
- The 89.1/88 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 25880 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 25880/25820 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
How does 25880 compare with a ball bearing of the same bore?
A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 25880 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
What shaft and housing fits suit 25880?
For a rotating shaft under normal load, seat the cone on a k5 shaft fit; the cup is usually a loose-to-transition fit in the housing so it can creep slightly and distribute wear. Chamfer and shoulder diameters must clear the bearing rings so the 23.812 mm-wide cup seats square; the mounting setting (end play or preload) is set by the axial position of the cup relative to the cone.
Is 25880 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 25880?
The SKF 25880/25820 is a single-row tapered roller bearing with 36.487 mm bore, 73.025 mm outer diameter and 23.812 mm width (1.436 × 2.875 × 0.937 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 89.1 kN, C0 88 kN, fatigue load limit Pu 9.8 kN, reference speed 8,000 r/min, limiting speed 9,500 r/min, mass about 460 g. It is an open, separable bearing with a pressed-steel cage.
How does the 25880 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 25800-series code marks the dimensional series. The metric dimensions 36.487×73.025×23.812 mm are the converted equivalents of the original inch boundary dimensions.
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.