NAO90X120X30-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 NAO90X120X30-XL model number is decoded

envelope 90×120×30 mm: 90 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 80 kN and C0 188 kN at the 90 mm seat; the C/C0 ratio of 0.43 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 120 mm outside diameter the fatigue load limit Cur is 32.5 kN, the limiting speed 4,700 r/min and the thermal reference speed 2,950 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 0.89 kN/mm and per millimetre of width 2.67 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.044 kg (1044 g), just 0.29 g per mm² of projected 120×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 90 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 Reading NAO: the O-suffix race design has no integral ribs on either ring, so the bearing can be separated and the outer assembly swivelled into split housings during mounting With the inner ring fitted the shaft seat stays at normal bearing-shaft tolerance; C0 is 188 kN and Cur 32.5 kN for the 1044 g unit As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 32.5 kN Cur value. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 120 mm outside diameter and 80 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 90 mm seat, and in agricultural machine pivots and linkages the 1.044 kg mass is part of the rotor inertia calculation. Designers also specify it for connecting-rod small ends, relying on the 30 mm width and the published 188 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. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.

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.
• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.
• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.