RNA4868-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 RNA4868-XL model number is decoded

envelope 370×420×80 mm: 370 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 25.0 mm radial section packed with small-diameter needle rollers C is 730 kN and C0 1940 kN at the 370 mm seat; the C/C0 ratio of 0.38 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 420 mm outside diameter the fatigue load limit Cur is 255 kN, the limiting speed 1,270 r/min and the thermal reference speed 640 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 1.97 kN/mm and per millimetre of width 9.13 kN/mm — the reason 80 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 14 kg (14000 g), just 0.42 g per mm² of projected 420×80 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 370 mm bore, 420 mm outside diameter: at this size the 1940 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs The hardness requirement is unforgiving: below about 58 HRC the 370 mm journal brinels under the 1940 kN static rating, and roughness above raceway finish accelerates roller wear RNA4868-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 X-life status (-XL) indicates the current Schaeffler premium execution at 370 mm bore; the 1940 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 420 mm outside diameter and 730 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 370 mm seat, and in rocker arms and valve trains the 14 kg mass is part of the rotor inertia calculation. Designers also specify it for planetary gear bearings, relying on the 80 mm width and the published 1940 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.
• 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.