RNA4922-XL bearing: complete specifications & equivalents

Specification table

Source: catalog reference (HR1 2026-09-25) · extracted 2026-09-30

Parameters extracted from the official FAG Rolling Bearings catalogue (HR1 2026-09-25); FAG® is a trademark of Schaeffler Technologies AG & Co. KG, used here for identification only — mpnbase is not an authorized FAG/Schaeffler distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at schaeffler.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 RNA4922-XL model number is decoded

envelope 125×150×40 mm: 125 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 149 kN and C0 290 kN at the 125 mm seat; the C/C0 ratio of 0.51 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 150 mm outside diameter the fatigue load limit Cur is 48 kN, the limiting speed 3,700 r/min and the thermal reference speed 2,430 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.19 kN/mm and per millimetre of width 3.73 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.24 kg (1240 g), just 0.21 g per mm² of projected 150×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 125 mm bore this is among the largest catalogue sizes; the 3,700 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position Reading the RNA49 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 125×150×40 mm envelope. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 150 mm outside diameter and 149 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 125 mm seat, and in gearbox selector and change linkages the 1.24 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 40 mm width and the published 290 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.
• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.
• Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.