25590-25522 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 25590-25522 model number is decoded

For a 45.618 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 25590 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel. Cross-section geometry: the 18.7 mm half-section ((83.058−45.618)/2) of this 25500-series unit places the roller large-end pitch diameter at roughly 64 mm, and the 23.876 mm axial width is split between cone (13 mm) and cup rib (11 mm) — a geometry that sets the contact angle and, with the 550 g rotating cone mass, the critical speed at which cage-roller imbalance begins. Cone-and-cup identity in 25590: the leading 25590 reference identifies the inner ring, rollers and cage; the trailing 25522 reference identifies the outer ring. The 25500-series series lists alternative cups for the same cone, each producing a different 83.058 mm OD or 23.876 mm width — hence a different SKU even though the bore stays at 45.618 mm.25590 is a single-row tapered roller bearing in the 25500-series inch series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.The code breaks down as cone/cup: the numbers before and after the slash identify the inner and outer ring sets, and the series prefix (25500-series) ties the pair to a specific boundary plan. Dimensions 45.618×83.058×23.876 mm are the converted metric envelope. 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. Catalogue mass 550 g for the 45.618×83.058×23.876 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.

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 (83.058×23.876 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.
• When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 25590 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
• At the 99.1 kN rating of 25590, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 8,000 r/min speed end and heavier preload only where moment stiffness dominates.
• Open 25590 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.
• 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 25590/25522 designation when purchasing and match the execution to the mounting arrangement.