RNA4876-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 RNA4876-XL model number is decoded

envelope 415×480×100 mm: 415 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 32.5 mm radial section packed with small-diameter needle rollers C is 1130 kN and C0 2900 kN at the 415 mm seat; the C/C0 ratio of 0.39 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 480 mm outside diameter the fatigue load limit Cur is 375 kN, the limiting speed 1,130 r/min and the thermal reference speed 520 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 2.72 kN/mm and per millimetre of width 11.30 kN/mm — the reason 100 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 26 kg (26000 g), just 0.54 g per mm² of projected 480×100 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 415 mm bore, 480 mm outside diameter: at this size the 2900 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs The thin 32.5 mm section makes the 26000 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting X-life status (-XL) indicates the current Schaeffler premium execution at 415 mm bore; the 2900 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 480 mm outside diameter and 1130 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 415 mm seat, and in agricultural machine pivots and linkages the 26 kg mass is part of the rotor inertia calculation. Designers also specify it for connecting-rod small ends, relying on the 100 mm width and the published 2900 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. 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.

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