RNA4906-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 RNA4906-XL model number is decoded

envelope 35×47×17 mm: 35 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 28.5 kN and C0 35.5 kN at the 35 mm seat; the C/C0 ratio of 0.80 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 6.6 kN, the limiting speed 12,600 r/min and the thermal reference speed 6,900 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 0.81 kN/mm and per millimetre of width 1.68 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 69.4 g, just 0.09 g per mm² of projected 47×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 35 mm bore places this bearing in the medium band, where the 47 mm envelope already carries ratings in the tens of kilonewtons RNA4906-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The hardness requirement is unforgiving: below about 58 HRC the 35 mm journal brinels under the 35.5 kN static rating, and roughness above raceway finish accelerates roller wear 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 35×47×17 mm envelope. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 47 mm outside diameter and 28.5 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 35 mm seat, and in small electric motor accessory drives the 69.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 17 mm width and the published 35.5 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.