NA4868-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 NA4868-XL model number is decoded

envelope 340×420×80 mm: 340 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 40.0 mm radial section packed with small-diameter needle rollers C is 730 kN and C0 1940 kN at the 340 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 620 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 2.15 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 24.2 kg (24200 g), just 0.72 g per mm² of projected 420×80 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 340 mm bore puts this execution at the top of the HR1 range — the 420 mm outside diameter, 80 mm width and 24.2 kg mass are built for primary-industry load cases The integral inner ring brings the bore to 340 mm inside the 420×80 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing The 40.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 730 kN C rating and longer nominal life come without an envelope change. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 420 mm outside diameter and 730 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 340 mm seat, and in small electric motor accessory drives the 24.2 kg mass is part of the rotor inertia calculation. Designers also specify it for gearbox selector and change linkages, relying on the 80 mm width and the published 1940 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.
• 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.