NA4910-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 NA4910-XL model number is decoded

envelope 50×72×22 mm: 50 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 11.0 mm radial section packed with small-diameter needle rollers C is 53 kN and C0 80 kN at the 50 mm seat; the C/C0 ratio of 0.66 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 72 mm outside diameter the fatigue load limit Cur is 14.1 kN, the limiting speed 7,800 r/min and the thermal reference speed 4,150 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 1.06 kN/mm and per millimetre of width 2.41 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 274 g, just 0.17 g per mm² of projected 72×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 50 mm bore marks the medium range: mounting forces and fits become critical, and the 274 g mass calls for proper induction or press tooling rather than hand fitting This is the choice for OEM production on soft shafts: machine the 50 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 7,800 r/min limit. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 72 mm outside diameter and 53 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 50 mm seat, and in copying and printing machine mechanisms the 274 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 22 mm width and the published 80 kN static rating. 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. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• 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.
• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.