22308 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings) · extracted 2026-09-26

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings); 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 22308 model number is decoded

SKF 22308 (22308 E) is the spherical-roller choice for a 40 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 90×33 mm ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 23 is the ISO 15 dimension series (dimension series 23 (heavy OD, wide)), and the last two digits encode the 40 mm bore; the 90 mm OD and 33 mm width follow the ISO 15 general plan. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 25.0 mm radial section height ((90−40)/2) and 1050 g catalogue mass frame a 40 mm bore bearing rated at 155 kN C — roughly 3.88 kN of dynamic capacity per millimetre of bore before application factors. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 40 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 40 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.
• The 22300-series series at 40 mm bore (90×33 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 8,000 r/min ceiling.
• The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.
• The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.
• The 155/140 kN ratings are SKF catalogue values for this exact execution (22308 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.
• SKF lists several executions of 22308 (cylindrical bore as listed, tapered-bore 22308 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22308 E designation when purchasing.