RNA4840-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 RNA4840-XL model number is decoded

envelope 220×250×50 mm: 220 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 260 kN and C0 720 kN at the 220 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 1,280 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 1.18 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 3.35 kg (3350 g), just 0.27 g per mm² of projected 250×50 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 220 mm bore puts this execution at the top of the HR1 range — the 250 mm outside diameter, 50 mm width and 3.35 kg mass are built for primary-industry load cases Omitting the inner ring frees radial space — at a 220 mm shaft the outer diameter is only 250 mm and the width 50 mm, yet C is 260 kN RNA4840-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 As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 104 kN Cur value. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 250 mm outside diameter and 260 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 220 mm seat, and in gearbox selector and change linkages the 3.35 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 50 mm width and the published 720 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.
• Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.