RNAO90X110X30-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 RNAO90X110X30-XL model number is decoded

envelope 90×110×30 mm: 90 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 76 kN and C0 172 kN at the 90 mm seat; the C/C0 ratio of 0.44 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 110 mm outside diameter the fatigue load limit Cur is 30 kN, the limiting speed 5,200 r/min and the thermal reference speed 3,450 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 0.84 kN/mm and per millimetre of width 2.53 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 610 g, just 0.18 g per mm² of projected 110×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 90 mm bore the 110 mm outside diameter and 30 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 5,200 r/min The shaft itself is the inner raceway: harden to 58–64 HRC and finish-grind to the catalogue journal tolerance, or the 172 kN static rating cannot be used Reading RNAO: O denotes the ribless (open-sided) race design; the single roller row runs directly between ground shaft and housing bore -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 76 kN C rating and longer nominal life come without an envelope change. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 110 mm outside diameter and 76 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 90 mm seat, and in rocker arms and valve trains the 610 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 30 mm width and the published 172 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.