RNAO20X28X13-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 RNAO20X28X13-XL model number is decoded

envelope 20×28×13 mm: 20 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 11.1 kN and C0 14.3 kN at the 20 mm seat; the C/C0 ratio of 0.78 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 28 mm outside diameter the fatigue load limit Cur is 2.35 kN, the limiting speed 21,300 r/min and the thermal reference speed 13,700 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 0.55 kN/mm and per millimetre of width 0.85 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 25 g, just 0.07 g per mm² of projected 28×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 20 mm bore the 13 mm width and 11.1 kN C rating suit high-cycle industrial machinery rather than instrument duty Flangeless races make this bearing purely radial — adjacent thrust washers or shoulders must locate the assembly axially and keep the rollers from walking off the journal At 25 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts X-life status (-XL) indicates the current Schaeffler premium execution at 20 mm bore; the 14.3 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 28 mm outside diameter and 11.1 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 20 mm seat, and in gearbox selector and change linkages the 25 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 13 mm width and the published 14.3 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.
• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.
• 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.