NA4824-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 NA4824-XL model number is decoded

envelope 120×150×30 mm: 120 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 112 kN and C0 239 kN at the 120 mm seat; the C/C0 ratio of 0.47 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 150 mm outside diameter the fatigue load limit Cur is 39.5 kN, the limiting speed 3,600 r/min and the thermal reference speed 2,070 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 0.93 kN/mm and per millimetre of width 3.73 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.17 kg (1170 g), just 0.26 g per mm² of projected 150×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 120 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 239 kN C0 rating still assumes full rigid support under both rings Cur 39.5 kN, limiting speed 3,600 r/min, reference speed 2,070 r/min — the inner ring adds a few grams (total 1170 g) but removes the hardening requirement 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 120×150×30 mm envelope. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 150 mm outside diameter and 112 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 120 mm seat, and in planetary gear bearings the 1.17 kg mass is part of the rotor inertia calculation. Designers also specify it for copying and printing machine mechanisms, relying on the 30 mm width and the published 239 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. 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

• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.
• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.
• 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.