RNA4848-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 RNA4848-XL model number is decoded

envelope 265×300×60 mm: 265 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 400 kN and C0 1080 kN at the 265 mm seat; the C/C0 ratio of 0.37 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 300 mm outside diameter the fatigue load limit Cur is 153 kN, the limiting speed 1,780 r/min and the thermal reference speed 980 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 1.51 kN/mm and per millimetre of width 6.67 kN/mm — the reason 60 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 5.4 kg (5400 g), just 0.30 g per mm² of projected 300×60 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 265 mm bore, 300 mm outside diameter: at this size the 1080 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs RNA4848-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 thin 17.5 mm section makes the 5400 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting 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 265×300×60 mm envelope. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 300 mm outside diameter and 400 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 265 mm seat, and in small electric motor accessory drives the 5.4 kg mass is part of the rotor inertia calculation. Designers also specify it for gearbox selector and change linkages, relying on the 60 mm width and the published 1080 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.

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.
• Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.
• 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.