RNA4852-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 RNA4852-XL model number is decoded

envelope 285×320×60 mm: 285 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 17.5 mm radial section packed with small-diameter needle rollers C is 415 kN and C0 1160 kN at the 285 mm seat; the C/C0 ratio of 0.36 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 320 mm outside diameter the fatigue load limit Cur is 161 kN, the limiting speed 1,660 r/min and the thermal reference speed 890 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 1.46 kN/mm and per millimetre of width 6.92 kN/mm — the reason 60 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 5.8 kg (5800 g), just 0.30 g per mm² of projected 320×60 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 285 mm bore puts this execution at the top of the HR1 range — the 320 mm outside diameter, 60 mm width and 5.8 kg mass are built for primary-industry load cases With Cur 161 kN and a 1,660 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins RNA4852-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 -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 415 kN C rating and longer nominal life come without an envelope change. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 320 mm outside diameter and 415 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 285 mm seat, and in gearbox selector and change linkages the 5.8 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 60 mm width and the published 1160 kN static rating. 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. 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

• 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.
• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.
• Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.