25590-25523 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 25590-25523 model number is decoded

In SKF suffix language a bare 25590 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Selection arithmetic: the C0/C ratio is about 1.07 (static 106 kN against dynamic 99.1 kN), typical of a tapered roller sized for axial capacity, and the 11.8 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A single 25590 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel. Dimensional interchange map: within the 25500 series at 45.618 mm bore, the 82.931 mm OD and 26.988 mm width are fixed by the ISO 355 plan, so any same-code bearing from another brand shares the mounting envelope; the 18.7 mm section height distinguishes this family from a 302 or 322 of the same bore, and the 590 g mass is the minimum—sealed or snap-ring executions add rotating weight above that catalogue baseline. Two catalogue entries share the 25590 cone but use different cups; this one, 25590, takes the 25523 cup and is ground for the resulting 82.931 mm OD / 26.988 mm width envelope. Selecting a sibling cup produces a different boundary plan and a different order number, so the full designation is required at purchase.SKF 25590 (SKF 25590/25523) is the 25500-series tapered roller choice for a 45.618 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 82.931×26.988 mm envelope.In SKF inch-series tables 25590 sits at 45.618 mm bore (1.796 in) with a 82.931 mm cup OD and 26.988 mm total width — dimensions that trace back to the original Timken boundary plan for the 25500-series family.

Typical equipment & failure modes

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 (82.931×26.988 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.
• 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 tapered contact angle creates an induced axial load under pure radial force; include it in the 25590 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 6,700 r/min reference is a thermal criterion under load, while the 8,000 r/min limiting value is the mechanical ceiling — observe both.
• 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 25590/25523 designation when purchasing and match the execution to the mounting arrangement.