25580-25520 bearing: complete specifications & equivalents

Specification table

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.

Cross references & equivalents

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 25580-25520 model number is decoded

Digit by digit, 25580 reads as cone reference / cup reference in the 25500-series inch series; the 44.45 mm bore, 82.931 mm OD and 23.812 mm width are the metric equivalents of the original inch boundary values. 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. Catalogue mass 570 g for the 44.45×82.931×23.812 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. Fit selection follows the rotating ring — interference on a rotating cone — and two 25580 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair. Dimensional interchange map: within the 25500 series at 44.45 mm bore, the 82.931 mm OD and 23.812 mm width are fixed by the ISO 355 plan, so any same-code bearing from another brand shares the mounting envelope; the 19.2 mm section height distinguishes this family from a 302 or 322 of the same bore, and the 570 g mass is the minimum—sealed or snap-ring executions add rotating weight above that catalogue baseline. Inch tapered bearings are matched sets, not mix-and-match components: 25580 pairs the 25580 cone with the 25520 cup under the 25500-series boundary plan, and although the same cone shows up against other cups in the catalogue, each pairing yields a distinct assembled width and a distinct rating row.The SKF 25580/25520 is a 44.45×82.931×23.812 mm single-row tapered roller bearing — an inch-series entry with an asymmetric raceway cut for thrust capacity and separable mounting.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 44.45 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 25580 pair heats, loses setting control and smears the roller-rib contact.
• The 25500-series inch series at 44.45 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.
• Do not mix brands or executions inside one 25580 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.
• Setting is a design value, not an assembly feel: excessive preload in the 25580 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
• 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 25580 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 25580/25520 designation when purchasing and match the execution to the mounting arrangement.