RNA4856-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 RNA4856-XL model number is decoded

envelope 305×350×69 mm: 305 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 22.5 mm radial section packed with small-diameter needle rollers C is 510 kN and C0 1300 kN at the 305 mm seat; the C/C0 ratio of 0.39 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 350 mm outside diameter the fatigue load limit Cur is 178 kN, the limiting speed 1,540 r/min and the thermal reference speed 850 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 1.67 kN/mm and per millimetre of width 7.39 kN/mm — the reason 69 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 9.3 kg (9300 g), just 0.39 g per mm² of projected 350×69 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 305 mm bore, 350 mm outside diameter: at this size the 1300 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The thin 22.5 mm section makes the 9300 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 305×350×69 mm envelope. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 350 mm outside diameter and 510 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 305 mm seat, and in textile machine heald and cam shafts the 9.3 kg mass is part of the rotor inertia calculation. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 69 mm width and the published 1300 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. 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.

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.
• 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.
• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.