NA4840-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 NA4840-XL model number is decoded

envelope 200×250×50 mm: 200 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 25.0 mm radial section packed with small-diameter needle rollers C is 260 kN and C0 720 kN at the 200 mm seat; the C/C0 ratio of 0.36 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 250 mm outside diameter the fatigue load limit Cur is 104 kN, the limiting speed 2,150 r/min and the thermal reference speed 1,250 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 1.30 kN/mm and per millimetre of width 5.20 kN/mm — the reason 50 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 5.84 kg (5840 g), just 0.47 g per mm² of projected 250×50 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 200 mm bore this is among the largest catalogue sizes; the 2,150 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 720 kN C0 rating still assumes full rigid support under both rings 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 200×250×50 mm envelope. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 250 mm outside diameter and 260 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 200 mm seat, and in copying and printing machine mechanisms the 5.84 kg mass is part of the rotor inertia calculation. Designers also specify it for agricultural machine pivots and linkages, relying on the 50 mm width and the published 720 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. 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

• 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.
• 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.